Influence of the Degree of Cold Drawing over the Wear Test and XRD Analysis of Pipes Used for Dampers

2014 ◽  
Vol 659 ◽  
pp. 85-90
Author(s):  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Petru Simion ◽  
Vasile Dia ◽  
Petru Avram ◽  
...  

Dumpers have studied intensively in the last years and they are the main parts of the suspension system with vertical oscillations role in the absorption of the automobile. The combination of suspension coil with dumper is forming the main body of the suspension system. Dumpers are mainly used for production of automotive industry. The influence of the degree of cold drawing on the mechanical properties of the carbon steel material were studied for the XRD and wear test point of view using microtribometer and diffractometer test machines. The purpose of the work is to observe the main effects of the degree of reduction at different gradations by analysing the X-Ray diffraction – crystallographic determination and scratch test by observing the wear tracks. It was finally measured the loss of material during the wear test, the sample with the highest grade of plastic deformation had the lowest material loss.

2020 ◽  
Vol 184 ◽  
pp. 01024
Author(s):  
Manne Vamshi ◽  
Animesh Bain ◽  
M. Sreekanth ◽  
Ram Subbiah

The investigation on the microstructure and mechanical behaviour of steel AISI 310 has been carried out during a Carbonitriding process aiming to improve the wear performance. The comparison study was made to treated specimens with untreated sample. Carbonitriding is a viable technique to enhance the wear resistance of the stainless steel material. The present study focused in the direction of investigating the effect of microstructure, hardness and wear resistance of AISI 310 stainless steel material. In carbonitriding process the case depth was found to be from 13, 16.5 and 19 Microns which is treated 2 hrs, 4hrs and 6 hrs respectively. The combination action of strong adhesion, abrasion and severe plastic deformation are the primary reasons for the continuous material loss in the untreated specimens during testing. The Optical microscope, SEM analysis and wear test are conducted to find out the various results.


2014 ◽  
Vol 1036 ◽  
pp. 134-139 ◽  
Author(s):  
Petru Simion ◽  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Vasile Dia ◽  
Petru Avram ◽  
...  

Dumpers are the main components of the suspension system with vertical oscillations role in the absorption of the automobile. The combination of suspension coil with dumper is forming the main body of the suspension system. Shock absorber pipe is mainly used for production of motorcycles, cars (sedan) car shock absorber, is the size of the relatively high precision seamless pipe products, its manufacturing costs and lower selling prices relatively seamless, with excellent cost performance, got the car and motorcycle manufacturing industry recognition, are gradually replacing the use of seamless pipes in the area. The cold work process of pipes drawing consists of reducing the cross-section of a pipe by pulling the pipe through series of conical dies. The metal pipe drawing technology has been widely used to manufacture fine pipes. The influence of the degree of cold drawing on the mechanical properties of the carbon steel material were studied using the tensile test and hardness test experiments in order to replicate the service condition of the pipes used for automotive dumpers. Microstructure analysis were perfomed using optical analysis on a LEICA 5000DMI microscope up to 1000X magnitude and SEM images with a dual beam QUANTA 200 3D FEI SEM scanning electron microscope. The purpose of the work is to observe the main effects of the degree of reduction at different gradations by analysing the microstructure and mechanical proprieties behavior. The study used the stress-strain relationship of the tensile test experiment to study the effect of the degree of cold-drawing deformation on the yield strength and tensile strength properties of the dumpers used in automotive industry. The toughness of the low carbon steel used for the dumper manufacture reduces as the degree of drawing deformation increases. The ductility of the material also reduces with increasing degree of rawing deformation. The yield strength of the material was observed to reduce with increasing degree of cold-drawing, an indication of reduction in the ductility and the tensile strength of the material reduced with increasing degree of cold-drawn deformation. After high degrees of cold deformation by drawing, the hardness proprieties are increasing highlighted by cold-straining.


2020 ◽  
Vol 184 ◽  
pp. 01023
Author(s):  
Manne Vamshi ◽  
J. Saranya ◽  
Ram Subbiah

. The investigation on the microstructure and mechanical behaviour of steel AISI 310 has been carried out during a Carburizing process aiming to improve the wear performance. The comparision study was made to treated specimens with untreated sample. Carburizing is a viable technique to enhance the wear resistance of the stainless steel material. The present study focused in the direction of investigating the effect of microstructure, hardness and wear resistance of AISI 310 stainless steel material. In carburizing process the case depth is found to be 11.5, 12, 14 Microns which is treated 2 hrs, 4hrs and 6 hrs respectively. The combination action of strong adhesion, abrasion and severe plastic deformation are the primary reasons for the continuous material loss in the untreated specimens during testing. The Optical microscope, SEM analysis and wear test are conducted to find out the various results


2015 ◽  
Vol 1110 ◽  
pp. 179-184
Author(s):  
Kyung Man Moon ◽  
Dong Hyun Park ◽  
Yun Hae Kim ◽  
Tae Sil Baek

Recently, anti-fouling paints which does not include the poison components such as tin (Sn) free, copper (Cu) free have been increasingly developed in order to decrease the contamination of marine environment. Moreover, the wear ratios of these anti-fouling paints are very important problem to prolong their life time in economical and environmental point of view. In this study, four types of anti-fouling paints as self-polishing type were investigated on the relationship between their polarization characteristics and wear ratios. Relationship between wear ratio and variation ratio of polarization resistance measured in corrosion potential was not well matched with each other. However, there was a good agreement between the wear ratio and variation ratio of diffusion limiting current density, for example, the higher or the lower variation ratio of diffusion limiting current density, wear ratio also increased or decreased respectively. Consequently, it is suggested that we can qualitatively expect the life time and wear degree of anti-fouling paint by only measuring the polarization characteristics before the wear test is practically performed in the field.Keywords: Anti-fouling paint, Self-polishing type, Polarization characteristics, Wear ratio, Diffusion limiting current density, Corrosion Potential


2020 ◽  
pp. 116-121
Author(s):  
Kseniia Ivanova

Problem setting. One of the subsystems of the National Innovative System is the field of technology transfer. Considering the NIS from the point of view of the interests pursued by its participants (subjects), the mechanism introduced by the legislator, providing legal regulation of certain social relations, directly depends on what interests they pursue. Analysis of recent researches and publications. The following scientists drew attention to the problems of regulation of relations in the field of technology transfer: O. M. Davydiuk, Yu. M. Kapitsa, D. S. Makhnovsky, V. S. Milash, O. P. Orlyuk, B. M. Paduchak, O. E. Simson. However, further study of these relations remains relevant especially in view of the constant updating of current legislation. Target of research is to analyze the mechanisms for satisfying the interests of participants (subjects) of technology transfer, which are introduced in the current legislation and are proposed for the future. Article’s main body. Considering the national innovative system from the point of view of the interests pursued by its participants (subjects), we can distinguish the interests of the author of the technology, recipient, technology donor and the state, whose interests determine the overall vector of the transfer process. The primary subject in technology transfer is the author of the technology – an individual who can act as a direct participant (subject) of technology transfer and be its donor, who independently decides the legal fate of the technology and / or its components. However, the author of the technology may not be a donor when it comes to the relationship between him and his employer as a performer of scientific research and development work for the budget. In this case, although the technology is created by the direct work of the author-employee, property rights to the technology are assigned to the enterprise, research institution, organization or institution of higher education as the executor of these works (organization-developer), and the author is entitled to royalties. Thus, a compromise is reached between the parties and provides the necessary balance of interests of the employer and the author. In the transfer of technology, which occurs through the conclusion of the contract, the interests of the parties to the contract are mutually conditioned. These entities, realizing their property interests, act in contractual relations on the principle of dispositiveness, ie equality of the parties, and the state does not interfere in these relations. And only when the sphere of interests of the subjects of transfer affects the interests of the state, the relationship is complicated by the establishment of additional requirements and / or procedures (in particular, the export of technologies created or purchased from the budget). The interest of the state in this case is due to the purpose of preserving national and technological security, control over the misuse of budget funds during the financing of R & D, solving other strategic tasks. The protective mechanism of legal support of the state’s interests introduced in the Law is implemented through the establishment of requirements for the use of technology and / or their components, created or purchased for budget funds, mainly on the territory of Ukraine; conducting state expertise for technologies and / or their components, which are purchased for budget funds (including through their import). Meanwhile, the world practice is aware of other means aimed at protecting the interests of the state, such as control over the re-export of technology in order to eliminate the possibility of further transfer of technology from its donor to others. Conclusions and prospects for the development. The field of technology transfer is characterized by a combination of imperative and dispositive methods of legal regulation. When concluding a technology transfer agreement, the parties agree on its terms, based on their own interests and the requirements for certain types of agreements. However, lawyers note: the wider the range of interests (individual, group), which are directly or indirectly affected by the contract, the more important should be the degree of legal regulation. Therefore, when it comes to the interests of the state, the legislator should not neglect the ability to imperatively determine the requirements to be met by the parties in technology transfer and which provide for the implementation of additional incentives for the introduction of domestic technologies into circulation, their practical application in production.


2020 ◽  
pp. 71-74
Author(s):  
Yulia Ryzhkova

Problem setting. Many decades have passed since the Pact was signed, and the essential nature of the it continues to spark debate among historians and scholars. The main criterion that continues debates is the fact that the signing of the act resulted in a change of the entire European continent and a change in the geopolitical balance. Therefore, the relevance of the topic is that today there is no clear political and moral assessment of the pact on the basis of which a rational international significance of the document could be established. Target of research. The purposes of this study are to establish the legal characteristics and nature of the Molotov – Ribbentrop Pact; to analyze the consequences of which the document has been signed; to distinguish the positive and negative sides of the act in combination with the proposal of its international significance. Analysis of resent researches and publications. The following scientists were engaged in research of the specified question: M. Shvagulak, S. Pron, I. Khalupa, Nicolas Burns and Andreas Ortega. Article’s main body. This publication discusses the document – the Molotov-Ribbentrop Pact, which has had a significant impact on both political and social development and the future potential of dozens of countries across the European continent. The Pact still defines many geopolitical realities in modern Europe. Discussions about the historic role of the non-aggression treaty and secret protocols are still relevant. The article deals with the legal characterization and essence of an international act of political and legal nature. The consequences of the signature of the “fateful sentence” are analyzed, as well as the positive and negative sides of this document, in combination with the establishment of its international significance, are highlighted and presented in detail. Conclusions and prospects for the development. Thus, as can be seen from all the work, the Molotov – Ribbentrop Pact has a rather contradictory character, both in relation to the countries it has in some way concerned and to history in general. So, on the one hand, this treaty was really beneficial and needed by the countries that signed it, namely Germany and the Soviet Union. However, the benefits in each of these countries were different. Discussions are still ongoing about the legal force of the treaty, as well as its international legal assessment. But from the point of view of international law, the Pact should be regarded as a huge violation that has influenced the development of new rules and principles in modern society. That is why the author believes that it is the Molotov – Ribbentrop Pact that became the signature of both states in the face of the forthcoming explosion of the largest Second world war.


2015 ◽  
Vol 55 (6) ◽  
pp. 388 ◽  
Author(s):  
Jakub Horník ◽  
Stanislav Krum ◽  
David Tondl ◽  
Maxim Puchnin ◽  
Pavel Sachr ◽  
...  

The paper deals with evaluation of single and multilayer layer PVD coatings based on Cr and Ti widely used in tool application. Additionally, W and WN based coating which are not so widespread were designed and deposited as functionally graded material. The coatings properties were evaluated from the point of view of hardness and adhesion. The hardness measuring was carried out using nanoindentation method. The scratch test was performed to test adhesion. Moreover, the presence of metallic interlayer in functionally graded materials further increases the coating adhesion by gradually approaching its composition to the substrate. Coatings consisting of W and WN have showed very good adhesion. With regard to the results of the scratch test, the multilayer coatings of CrN, TiN and WN have increased adhesion and can be assumed to have their protective function improved. Results will be appliedin development of functionally graded layers for functionally graded materials.


Author(s):  
O. P. Bodunde ◽  
S. M. Gao ◽  
M. Qin ◽  
W. H. Liao

Abstract Nickel-Titanium (NiTi) shape memory alloys (SMAs) are a class of promising materials for bio-implant, transportation, and aerospace applications. These interesting applications of SMA are as a result of their ability to exhibit shape memory effect (SME) and super-elasticity (SE). SMAs, especially NiTi which has been proven to have good mechanical properties, are however limited by their operational fatigue as reported in the literature. In this paper, a near equiatomic NiTi SMA was hybridized with zirconium (Zr), molybdenum (Mo) and copper (Cu), which are available and economic viable α-, β-, γ- stabilizing additives suitable for NiTi SMAs. Each of Zr, Mo, Cu were hybridized separately with the bare near equiatomic NiTi SMA. The compositional requirements for each of the sub-hybrids (NiTi-α, NiTi-β, and NiTi-γ respectively) were experimentally determined to know the optimum composition which could indicate the presence of austenitic and martensitic phases. Scan electron microscopy (SEM) was performed on each of the hybridizing additives as well as the bare equiatomic NiTi to determine their particle sizes and investigate their compatibility (between 30 and 40 microns) with the 3D printer used in the study. X-ray diffractometric (XRD) analysis also was carried out on the bare SMA and its additives to determine the presence of B2 and B19’ peaks. Afterward, NiTi-α, NiTi-β, and NiTi-γ were 3D printed to produce fretting wear test specimens and finally, the fretting wear behaviors of the NiTi hybrids were studied in detail with the objective of testing their performances under fretting wear mode as it may be required for an application. A tungsten carbide counter-body was used. The results from the characterization through XRD indicated that all of α-, β-, γ- stabilizing additives with NiTi respectively showed the presence of B2 and B19’ in the inter-metallic phases. Details of wear microstructure were reported and its information could be useful for professionals who require hybridized NiTi alloys for various engineering applications.


2010 ◽  
Vol 139-141 ◽  
pp. 439-442
Author(s):  
Li Jie Wang ◽  
Jun Sheng Yang ◽  
Ya Zhe Xing

A composite layer was prepared on the Ti-6Al-4V alloy surface by ion nitriding, magnetron sputtering Mo and ion sulfurizing composite treatment technique. The phase structure, morphology, and cross-sectional element distribution of composite layer were analyzed. Friction and wear properties of composite layer were tested by MM-200 laboratory tester. XRD analysis showed that the composite layer was mainly comprised of Ti, Mo, MoS2, TiN, and transition layer. This composite layer is perfect wear-resistant surface due to existence of self-lubricating MoS2 on hard Mo and TiN layers with good anti-friction ability. Thereby, the results of friction and wear test showed that anti-wear performance of Ti-6Al-4V alloy after composite treatment was remarkably improved under dry and sliding conditions. Both the friction coefficient and the wear loss of the nitriding-Mo plating-sulfurizing layers were lower than that of the nitriding layer due to the formation of the MoS2 layer on Mo and TiN layers.


2016 ◽  
Vol 716 ◽  
pp. 988-993
Author(s):  
Milan Mojžiš ◽  
Martin Ridzoň ◽  
Peter Bella ◽  
Maroš Martinkovič ◽  
Ľudovít Parilák

The production of precision seamless steel tubes in Železiarne Podbrezová is using hot rolled tubes with multiple cold drawing passes and intermediate annealing. It utilizes intensive plastic deformation during cold drawing, taking full advantage of the microstructural state from a physical point of view. In this paper, optimization of technological processes for cold drawn tubes made from ferritic-pearlitic steel has been elaborated. We use microstructural and substructural analysis, dislocation hardening theory and stress analysis. The subject of this article is the experiment with multiple drawing passes and intermediate annealing for production of precision steel tubes with dimensions of 31.8 x 2.6 mm. The drawing itself consists of 5 processes (also called „runs“) with 7 drawing passes in total. The results presented show strain hardening of the material after drawing along with relaxation mechanism during intermediate annealing. The possibility of utilizing the microhardness values on intensity assessment of these processes is investigated, too.


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