scholarly journals Non-Destructive Hardness/Microstructure Testing of Heat-Treated Parts by Mass Production, with Multiple Frequency Magnetic Induction Method

2019 ◽  
Author(s):  
A. Horsch
Keyword(s):  
Product Liability ◽  
New Product ◽  
Material Structure ◽  
Multiple Frequency ◽  
Induction Method ◽  
Safety Requirements ◽  
Heat Treated ◽  
Simple Basis ◽  
Market Networks ◽  
Non Destructive

Abstract Increasing quality demands, new product liability regulations, as well as international market networks force manufacturers to take special measures encompassing the field of material testing. Nowadays, specified tolerances are extremely small. Therefore, processes have to include the conducting of 100% material, structure and hardening tests on a fast, reliable and simple basis. The technology applied must be the latest state of art, it must comply with maximum safety requirements and be economical.

Pressure Gauge Safety

1980 ◽  
Vol 13 (8) ◽  
pp. 283-283 ◽  
Keyword(s):  
Pressure Gauge ◽  
Health And Safety ◽  
Product Liability ◽  
British Standard ◽  
Safety Requirements ◽  
Safety Regulations

The British Pressure Gauge Manufacturers Association has always emphasised the need for strict observance of recognised safety requirements when using pressure gauges. Unfortunately, gauges are both available and used that do not meet the rigid safety regulations laid down in British Standard 1780 and this could lead to serious accidents. The provisions of the Health and Safety at Work Act coupled with the strengthened proposals for Product Liability will place a greater statutory responsibility upon the manufacturer and user alike. The Association has therefore prepared the following statement:

INFORMATION AND KINETIC APPROACH TO THE EVALUATION OF STRESS STATE OF VESSELS OPERATING UNDER PRESSURE IN HYDROGEN ENVIRONMENTS

2021 ◽  
pp. 30-45
Author(s):  
V. V. Nosov ◽  
A. R. Yamilova
Keyword(s):  
Acoustic Emission ◽  
Pressure Vessels ◽  
Maximum Activity ◽  
The State ◽  
Material Structure ◽  
Diagnostic Efficiency ◽  
Active Volume ◽  
And Control ◽  
Non Destructive ◽  
Altitude Level

Separation of the influence of various factors on the strength of the material and control parameters is the basis for increasing the diagnostic efficiency. The article describes methods for assessing the state of pressure vessels, features of their damage under conditions of hydrogen absorption, presents data from acoustic emission and ultrasonic testing, compares them, sets out an approach to non-destructive assessment of the strength state of technical objects, based on a multilevel model of time dependences of acoustic emission parameters (AE), the kinetic concept of strength, micromechanics of fracture of discrete media, their relationship with the resource, parameters of fatigue curves and characteristics of the material structure, the problems of the influence of strength and metrological heterogeneity on the information content of control, the sequence of assessing the indicators of the strength state and resource of vessels, the model of strength and metrological heterogeneity of the AE are presented control, explaining the maximum activity of AE during tests in the first periods of operation, a methodology for assessing the strength state of pressure vessels is presented. Demonstration of the effectiveness of the technique is shown as an example of AE testing of an absorber for purifying hydrogen sulfide with a monoethanolamine solution by predicting the resource of its components and comparing the prediction results with the coordinate-altitude level of the adsorber belt, which correlates with the average internal hydrostatic stresses. Approbation of the approach has shown its versatility on the example of effective application for objects with defects of both fatigue and chemical origin under conditions of hydrogenation. Using the example of assessing the state of the most damaged lower belt, it is shown that an increase in the AE activity during hydrogenation of the material occurs mainly due to the growth of the acoustically active volume of the controlled zone, which is not unambiguously associated with the resource, and therefore the activity and energy intensity of the AE should not be considered sufficient a sign of the danger of a defect formed under the influence of hydrogen-containing media.

New Generation of Brake Callipers to Improve Competitiveness and Energy Savings in Very High Performance Cars

2014 ◽  
Vol 217-218 ◽  
pp. 471-480
Author(s):  
Ivano Gattelli ◽  
Gian Luigi Chiarmetta ◽  
Marcello Boschini ◽  
Renzo Moschini ◽  
Mario Rosso ◽  
...  
Keyword(s):  
High Pressure ◽  
High Performance ◽  
Energy Savings ◽  
High Reliability ◽  
A357 Alloy ◽  
Bench Tests ◽  
Heat Treated ◽  
New Generation ◽  
Non Destructive ◽  
Very High

This paper concerns with the optimisation of the innovative rheocasting process to produce a new generation of brake callipers, characterised by very high reliability and strength. The attained very promising properties favoured their use on a very high performance car and the presented technique can be further extended for other important challenging applications. The prototype components are produced using T6 heat treated A357 alloy. Results on the samples machined directly from the produced callipers are in detail described and analysed. Pieces exhibiting some small defects, individuated by non-destructive tests, as well as defectless pieces have been underlined to severe industrial tests, e.g. high pressure tight, as well as severe bench tests, and it has been observed that the proposed technological process assure the fulfilment of the requirements contained in standards.

Application of Ultrasonic Inspection for Microstructure Analysis of Stainless Steel Grade 304L

2019 ◽  
Vol 798 ◽  
pp. 32-37
Author(s):  
Kittichai Sojiphan ◽  
Phongsathon Wangsupangkul ◽  
Tanapat Chailampangsuksakul
Keyword(s):  
Stainless Steel ◽  
Attenuation Coefficient ◽  
Ultrasonic Inspection ◽  
Correlation Study ◽  
Polycrystalline Materials ◽  
Destructive Testing ◽  
Electron Backscattered Diffraction ◽  
Heat Treated ◽  
Mechanical Waves ◽  
Non Destructive

Ultrasonic inspection is one of the most widely used non-destructive testing methods for inspection of fabricated structures and components. During ultrasonic inspection, mechanical waves in form of ultrasound are transmitted and propagate through volume of parts or components and reflect when the waves meet with the existing interface such as flaws in the welds. In addition to detection of flaws or defects within the structures, ultrasonic inspection is also used for determination of component thickness as well as characterization of microstructure of different materials. As the ultrasound is transmitted through media, the loss of ultrasound amplitude is referred to as acoustic attenuation. This attenuation effects greatly result from heterogeneity, anisotropy, and different grain sizes of crystalline media the ultrasound goes through. In order to develop the ultrasonic backscattering models for polycrystalline materials, experimental results of the correlation between the changes in attenuation coefficient and the actual microstructure of polycrystalline materials are necessary. This research article presents the preliminary results of this correlation study in stainless steel 304L specimens in as-received conditions compared with different annealed and heat-treated conditions. Such correlations of attenuation coefficient, hardness, and grain size will be used as baseline for future additional characterization technique such as electron backscattered diffraction to better understand the attenuation effects for textured polycrystalline materials.

Considerations on the Reliability of Advanced Squeeze Casting Process

2012 ◽  
Vol 504-506 ◽  
pp. 361-366
Author(s):  
Mario Rosso ◽  
Ildiko Peter
Keyword(s):  
High Performance ◽  
Fracture Behavior ◽  
Squeeze Casting ◽  
Casting Process ◽  
Standard Samples ◽  
Heat Treated ◽  
Semi Solid ◽  
Non Destructive ◽  
Squeeze Casting Process ◽  
A380 Alloys

This paper presents an analysis of an advanced squeeze casting process suitable for the manufacturing of high performance industrial components more quickly and cheaply. After a short description of the process, some produced components are considered. The components, in A380 alloys, have been T6 heat treated and their soundness has been certified by non destructive tests. All considered components have been designed for advanced application in the automotive field, in particular for quite important sport cars. Standard samples for tensile and impact tests have been machined directly from the previous components. After the execution of the tests the fracture surface of samples has been observed by SEM in order to analyze details and to evaluate the influence of the process and of the alloy on the fracture behavior. On polished transverse sections of samples the microstructure of the alloy has been observed, highlighting a mainly globular shaped microstructure as expression of the attained semi-solid conditions during the processes. A critical analysis has been developed to evaluate the real potential and to present some criticism of the process.

Developments in Wire-EDM for the Manufacturing of Fir Tree Slots in Turbine Discs Made of Inconel 718

2012 ◽  
Vol 504-506 ◽  
pp. 1177-1182 ◽  
Author(s):  
Fritz Klocke ◽  
David Welling ◽  
Jens Dieckmann ◽  
Drazen Veselovac ◽  
Roberto Perez
Keyword(s):  
Cross Section ◽  
Manufacturing Processes ◽  
Wire Edm ◽  
Safety Requirements ◽  
Critical Components ◽  
The One ◽  
Non Destructive ◽  
Edm Process ◽  
Brass Wire ◽  
Tree Production

This paper deals with developments of Wire-EDM technologies for fir tree slot production. The aim of these developments is to substitute certain conventional processes within turbine manufacturing that have been identified as non-optimal like the critical broaching process. Thereby the negative characteristics like inflexible manufacturing processes, high machine tool investment costs and huge energy consumption can be abolished. The objective targets of the conducted research are to meet all safety requirements of the critical components and get an economic manufacturing process. In the first step a special brass wire technology for cutting Ni-based super alloys was developed. Main focus was to meet the requirements of fir tree production concerning aspects of surface integrity and geometry. To measure these aspects on the one hand non-destructive analyses have been performed to guarantee surface roughness and accuracy. On the other hand destructive analyses in terms of cross section polishing for showing thermal influenced rim zones have been prepared. A capable Wire-EDM process is presented.

scholarly journals Analysis Of Potentiometric Methods Used For Crack Detection In Forging Tools

2015 ◽  
Vol 12 (1) ◽  
pp. 27-30
Author(s):  
Jozef Pilc ◽  
Mário Drbúl ◽  
Dana Stančeková ◽  
Daniel Varga ◽  
Juraj Martinček ◽  
...  
Keyword(s):  
Crack Detection ◽  
High Hardness ◽  
Core Material ◽  
Tool Steels ◽  
Working Process ◽  
The Core ◽  
Heat Treated ◽  
The Right ◽  
The Cost ◽  
Non Destructive

Abstract Increased use of forging tools in mass production causes their increased wear and creates pressure to design more efficient renovation process. Renovation is complicated because of the identification of cracks expanding from the surface to the core material. Given that the production of forging tools is expensive, caused by the cost of tool steels and the thermo-chemical treatment, it is important to design forging tool with its easy renovation in mind. It is important to choose the right renovation technology, which will be able to restore the instrument to its original state while maintaining financial rentability. Choosing the right technology is difficult because of nitrided and heat-treated surface for high hardness and wear resistance. Article discusses the use of non-destructive method of detecting cracks taking into account the size of the cracks formed during working process.

scholarly journals Evaluation of Effectiveness of Heat Treatments in Boron Steel by Laser Thermography

2021 ◽  
Vol 8 (1) ◽  
pp. 8
Author(s):  
Giuseppe Dell’Avvocato ◽  
Davide Palumbo ◽  
Maria Emanuela Palmieri ◽  
Umberto Galietti
Keyword(s):  
Heat Treatment ◽  
Surface Modification ◽  
Heat Treatments ◽  
Boron Steel ◽  
Active Thermography ◽  
Heat Treated ◽  
Surface Laser ◽  
Boron Steels ◽  
Non Destructive

The applicability of active thermography as a non-destructive method to distinguish heat treated from not-treated boron steel has been investigated. While the usual hardness semi-destructive tests influence the inspected surface, laser thermography is capable of verifying the effectiveness of heat treatment in boron steel in a non-destructive way without any surface modification. The procedure has been verified on two plates of boron steels with different structures (100% ferritic–pearlitic and 100% martensitic).

Characterization of Cold Rolled Austenitic Stainless Steel by Ultrasonic Longitudinal Velocity

2012 ◽  
Vol 510-511 ◽  
pp. 475-480
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Longitudinal Velocity ◽  
Life Assessment ◽  
Material Structure ◽  
Velocity Measurements ◽  
Cold Rolled ◽  
Non Destructive

Ultrasonic testing has a strong application in defect detection. An efficient tool for characterizing and life assessment of material structure and components by nondestructive ultrasonic velocity was developed about thirty years ago. Cold rolling results in increase in strength and hardness. The work discussed here is to study quantitative ultrasonic longitudinal velocity for characterizing a change in microstructure due to cold rolling in austenitic stainless steel samples. Samples were cold rolled upto 80 percent in 10 percent step. It was found that the use of velocity measurements is a useful quantitative and non-destructive tool for characterizing amount of cold rolled austenitic stainless steel.

Study of Fine-Grained Cementitious Composites in Solidification Phase Using Acoustic Testing Technique

2020 ◽  
Vol 897 ◽  
pp. 111-116
Author(s):  
Michaela Hoduláková ◽  
Libor Topolář
Keyword(s):  
Solidification Process ◽  
Cementitious Composites ◽  
Material Structure ◽  
Early Hydration ◽  
Cement Pastes ◽  
Measuring Device ◽  
Fine Grained ◽  
Mechanical Waves ◽  
Nonintrusive Monitoring ◽  
Non Destructive

The paper deals with experimental analysis, which is focused on the use of acoustic measurement during the solidification process. As a material for monitoring was chosen fine-grained cementitious composites in the laboratory environment. For this purpose, a measuring device working on the principle of mechanical waves passing through the material was designed, assembled and verified. The experiment was conducted on cement pastes prepared from CEM I 42.5 R Portland cement with two different water coefficients (w/c = 0.40 and w/c = 0.33). The differences in the wave propagation in cement pastes were investigated. Simultaneously with this experiment, the monitoring and the saving records of the internal temperature was conducted. The results show the time of „critical changes" in the internal structure of the material can be determined. These changes are probably related to the quality of the particle’s bonds in the inner material structure, which is reflected in the propagation of mechanical waves. Overall, it is shown these experiments could be used to expand the understanding of the various processes occurring during early hydration of cement, and the application of these results to field situations (in the future) could lead to the other development of, non-destructive (and nonintrusive) monitoring techniques.

Sign in / Sign up

Export Citation Format

Share Document