Peculiarities of Quality Ensuring in Parts from Ti-Based Alloy VT6 with Ultrafine-Grained Structure

2016 ◽  
Vol 684 ◽  
pp. 440-444
Author(s):  
Eduard Vilardovich Safin ◽  
Anatoliy Mikhailovich Smyslov
Keyword(s):  
Surface Hardening ◽  
High Load ◽  
Ultrafine Grained Structure ◽  
Technological Factors ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Machine Parts ◽  
Directed Change

The work analyzes application perspectives of Ti-based alloy VT6 (Ti-6Al-4V) with an ultrafine-grained structure with different grain sizes as structural material to produce high-load machine parts. The paper considers technological factors for ensuring quality of parts with account of assumed conditions of their exploitation, differently directed change of mechanical properties with reduction of an average grain size and choice of surface hardening technique.

scholarly journals Effect of Hydrogen on the Deformation Behavior and Localization of Plastic Deformation of the Ultrafine-Grained Zr–1Nb Alloy

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 592
Author(s):  
Ekaterina Stepanova ◽  
Galina Grabovetskaya ◽  
Maxim Syrtanov ◽  
Ivan Mishin
Keyword(s):  
Plastic Deformation ◽  
Deformation Behavior ◽  
Macro Level ◽  
Hydrogen Effect ◽  
Ultrafine Grained Structure ◽  
Fine Grained ◽  
Element Size ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Localization Of Plastic Deformation

In this paper, comparison studies of the hydrogen effect on the structural and phase state, deformation behavior, and mechanical properties of the fine- (average grain size 4 µm) and ultrafine-grained (average element size 0.3 and 0.4 µm) Zr–1wt.%Nb (hereinafter Zr–1Nb) alloy under tension at temperatures in the range of 293–873 K were conducted. The formation of an ultrafine-grained structure is established to increase the strength characteristics of the Zr–1Nb alloy by a factor of 1.5–2 with a simultaneous reduction of its resistance to the localization of plastic deformation at the macro level and the value of deformation to failure. The presence of hydrogen in the Zr–1Nb alloy in the form of a solid solution and hydride precipitates increases its resistance to the localization of plastic deformation at the macro level if the alloy has an ultrafine-grained structure and decreases if the structure of the alloy is fine-grained. In the studied temperature range, the Zr–1Nb alloy in the ultrafine-grained state has a higher resistance to hydrogen embrittlement than the alloy in the fine-grained state.

scholarly journals Solid-state welding of ultrafine grained copper rods

2021 ◽  
Vol 21 (3) ◽  
Author(s):  
Łukasz Morawiński ◽  
Cezary Jasiński ◽  
Marta Ciemiorek ◽  
Tomasz Chmielewski ◽  
Lech Olejnik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Contact Surface ◽  
Base Material ◽  
Low Energy ◽  
Direct Drive ◽  
Ultrafine Grained ◽  
Rotary Friction Welding ◽  
Machine Parts ◽  
Welding Pressure

AbstractThe article focuses on the Direct Drive Rotary Friction Welding of ultrafine-grained copper rods, which feature increased mechanical properties and good electrical properties, yet are limited in size. The use of UFG metals is often limited by the too small dimensions of semi-finished elements produced by SPD methods. Therefore, the production of finished machine parts from UFG metals is currently economically unjustified. Dismissal of dimensional limitations can be done by introducing joining to technological processes. The proposed joining method does not lead to a melting of the material in the joining zone or excessive degradation of the UFG microstructure. To obtain the best results, the research used the method of low-energy welding of two kinds of specimens: with a flat or a conical contact surface. In the article, the authors present, by means of metallographic microsections and microhardness measurements, the influence of rotational speed, welding pressure and conical shape contact surface on the quality of the obtained joints. The conducted research made it possible to obtain good quality joints whose microhardness is reduced only by about 10% in comparison with the base material and the tensile strength dropped from only 397–358 MPa.

Microstructure of AA7075 Based Composite by Accumulative Roll Bonding Process

2015 ◽  
Vol 1123 ◽  
pp. 114-118 ◽  
Author(s):  
Agus Pramono ◽  
Lauri Kollo ◽  
Renno Veinthal
Keyword(s):  
Accumulative Roll Bonding ◽  
High Load ◽  
Bonding Process ◽  
Advanced Materials ◽  
Accumulative Roll Bonding Process ◽  
Roll Bonding ◽  
Alloy Series ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Ultrafine Grained Materials

Accumulative Roll Bonding (ARB) is a Severe Plastic Deformation (SPD) process invented in order to fabricate ultrafine grained materials. Aluminum Alloy series 7075 (AA7075) is a metal as a matrix reinforced by Alumina Nanofiber (ANF). In the development of advanced materials, AA7075/ANF composite metal is very suitable if it is processed by ARB, due to the combination of high style roll that is capable of producing material properties better. Hardness of AA77075 without reinforcement reached 128.3 Hv10. The additions of ANF on AA7075 reduce the hardness of 103.2 Hv10. This is due to large deformation of high load on the ARB which results in decrease levels of precipitates as well as lower density and reduction in the average grain size.

Analysis and Quantification of Grain Size of Various DHP Copper Tubes Manufacturing Processes

2013 ◽  
Vol 856 ◽  
pp. 241-245 ◽  
Author(s):  
Ehsaan Reza Bagherian ◽  
Colin Bell ◽  
Mervyn Cooper ◽  
Yong Chang Fan ◽  
Brian Frame ◽  
...  
Keyword(s):  
Grain Size ◽  
Industrial Processes ◽  
Manufacturing Processes ◽  
Counting Method ◽  
Grain Sizes ◽  
Average Grain Size ◽  
Continuously Cast ◽  
Manufacturing Methods ◽  
Do So

Deoxidized High Phosphorus (DHP) Copper tubes are frequently used in numerous industrial and household applications. To ensure the acceptability of DHP copper tubes prepared by various industrial processes, the quality of the DHP copper tubes must be evaluated and one of the best ways to do so is to examine the microstructure and metallography and quantify grain size. In this paper the authors considered the average grain size of copper tube samples made traditionally as well as by the planetary rolling and CastTube process. Because of the small thickness of the CastTube samples, in certain circumstances traditional methods of grain counting were not plausible and a new procedure for grain counting needed developed. This paper is about the development and evaluation of grain sizes in continuously cast tube samples using both the planimetric procedure (ASTM E112) and a new method, which will be herby, referred to as the total grain counting method. This paper also concludes that there is a large difference in the grain size of tubes with different manufacturing methods.

Measurement of WC Grain Size in Ultrafine Grained WC-Co Cemented Carbides

2013 ◽  
Vol 278-280 ◽  
pp. 460-463 ◽  
Author(s):  
Yi Gao Yuan ◽  
Xiao Xiao Zhang ◽  
Jian Jun Ding ◽  
Jun Ruan
Keyword(s):  
Grain Size ◽  
Diffraction Method ◽  
Cemented Carbides ◽  
Polished Surface ◽  
Grain Sizes ◽  
Ultrafine Grained ◽  
Average Grain Size ◽  
Measurement Results ◽  
Backscattered Electron ◽  
Imagej Software

Based on the backscattered electron (BSE) images and IMAGEJ image analysis software, the average grain size of WC in ultrafine grained WC-Co cemented carbides was measured. The result shows that BSE images of the polished surface not be etched are suitable for quantitative evaluating the grain size of WC in the ultrafine grained hardmetals. Both linear intercept method and equivalent circle diameter method can be used to accurately measure the grain sizes of WC in ultrafine grained hadmetals by using IMAGEJ software. Measurement results of WC grain sizes coincide with the conclusion of X-ray diffraction method

Microstructure Evolution and Mechanical Properties of Titanium Nickelide during Pressing in Equal-Channel Angular Matrix with Quasi-Small Angle of Channels Intersection

2021 ◽  
Vol 410 ◽  
pp. 123-127
Author(s):  
Abdrakhman B. Naizabekov ◽  
Dmitry V. Kuis ◽  
Andrey V. Kasperovich
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Microstructure Evolution ◽  
Small Angle ◽  
Titanium Nickelide ◽  
Coarse Grained ◽  
Ultrafine Grained Structure ◽  
Ultrafine Grained ◽  
Average Grain Size

The article presents the results of the analysis of the microstructure and mechanical properties of titanium nickelide formed during pressing in an equal-channel angular matrix with a quasi-small angle of channels intersection. The conducted studies have shown that pressing in an equal-channel angular matrix with a quasi-small angle of channels intersection ensures the formation of a homogeneous sub-ultrafine-grained structure in the titanium nickelide alloy, while the average grain size, decreasing by 100-200 times, is 0.3-0.5 microns, and the tensile strength increases to 1350 MPa in 6 passes, which is almost 90% higher than in the coarse-grained quenched state.

Influence of technological factors on the process of production and quality of bread from spelt flour

2020 ◽  
Vol 8 (14) ◽  
pp. 137-144
Author(s):  
Oksana Naumenko ◽  
◽  
Tetiana Polonska ◽  
Inna Hetman ◽  
Nataliia Bela ◽  
...  
Keyword(s):  
Technological Factors

Theoretical justifi cation for use of combined methods for hardening of surfaces of machine parts in order to control their fretting resistance

2020 ◽  
pp. 339-342
Author(s):  
V.F. Bez’yazychny ◽  
M.V. Timofeev ◽  
R.V. Lyubimov ◽  
E.V. Kiselev
Keyword(s):  
Surface Layer ◽  
Fatigue Limit ◽  
Surface Hardening ◽  
Theoretical Justification ◽  
Hardening Process ◽  
Subsequent Application ◽  
Machine Parts ◽  
Combined Methods

The theoretical justification for the hardening process of the surface layer of machine parts for combined methods of surface hardening with subsequent application of strengthening coatings, as well as reducing or increasing the fatigue limit due to the fretting process is presented.

scholarly journals Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1537
Author(s):  
Beata Skowrońska ◽  
Tomasz Chmielewski ◽  
Mariusz Kulczyk ◽  
Jacek Skiba ◽  
Sylwia Przybysz
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Friction Welding ◽  
High Speed ◽  
316L Stainless Steel ◽  
Welded Joint ◽  
Microstructural Investigation ◽  
Ultrafine Grained Structure ◽  
Ultrafine Grained ◽  
Friction Joint

The paper presents the microstructural investigation of a friction-welded joint made of 316L stainless steel with an ultrafine-grained structure obtained by hydrostatic extrusion (HE). Such a plastically deformed material is characterized by a metastable state of energy equilibrium, increasing, among others, its sensitivity to high temperatures. This feature makes it difficult to weld ultra-fine-grained metals without losing their high mechanical properties. The use of high-speed friction welding and a friction time of <1 s reduced the scale of the weakening of the friction joint in relation to result obtained in conventional rotary friction welding. The study of changes in the microstructure of individual zones of the friction joint was carried out on an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscattered diffraction (EBSD) analysis system. The correlation between the microstructure and hardness of the friction joint is also presented. The heat released during the high-speed friction welding initiated the process of dynamic recrystallization (DRX) of single grains in the heat-affected zone (HAZ). The additional occurrence of strong plastic deformations (in HAZ) during flash formation and internal friction (in the friction weld and high-temperature HAZ) contributed to the formation of a highly deformed microstructure with numerous sub-grains. The zones with a microstructure other than the base material were characterized by lower hardness. Due to the complexity of the microstructure and its multifactorial impact on the properties of the friction-welded joint, strength should be the criterion for assessing the properties of the joint.

Application of Machine Vision System in the Precision Inspection

2012 ◽  
Vol 546-547 ◽  
pp. 1382-1386
Author(s):  
Yin Xia Liu ◽  
Ping Zhou
Keyword(s):  
Machine Vision ◽  
Vision System ◽  
Machine Vision System ◽  
Technical Problems ◽  
Application Program ◽  
Precision Inspection ◽  
Machine Parts

In order to promote the application and development of machine vision, The paper introduces the components of a machine vision system、common lighting technique and machine vision process. And the key technical problems are also briefly discussed in the application. A reference idea for application program of testing the quality of the machine parts is offered.

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