The Effect of Heat Treatment on Microstructure and Performance of Die Forging Copper

2013 ◽  
Vol 690-693 ◽  
pp. 58-61
Author(s):  
Gui Rong Yang ◽  
Wen Ming Song ◽  
Ying Ma ◽  
Yuan Hao
Keyword(s):  
Heat Treatment ◽  
Dislocation Density ◽  
Electric Conductivity ◽  
Annealing Treatment ◽  
Technical Parameter ◽  
Copper Specimen ◽  
Die Forging ◽  
And Performance ◽  
Equiaxed Grain ◽  
Microstructure And Performance

The copper specimen was fabricated through liquid die forging under optimum technical parameter, and the die forging copper was annealed under different conditions. The effect of annealing treatment on the microstructure, strength, hardness and electric conductivity of die forging copper was investigated. The results show that the microstructure of die forging copper was changed into equiaxed grain when the treating temperature was less than 250 °C and treating time was less than 2.0 h. The restoration and recrystallization happened during treatment and the obtained crystal grain size became smaller. The strength of die forging copper decreased after annealing treatment owing to the decreasing of dislocation density and concentration of supersaturated vacancy. The hardness of die forging copper also dropped to some extent. The electric conductivity of die forging copper was increased by 5.2% after annealing treatment because the concentration of supersaturated vacancy and dislocation density was decreased obviously.

Influence of rhenium and tungsten on the microstructure and performance of GH4169 alloy through heat treatment

2020 ◽  
Vol 9 (3) ◽  
pp. 705-715
Author(s):  
Zhiyun Wang ◽  
Bin Liu ◽  
Peikang Bai ◽  
Zhanyong Zhao ◽  
Haili Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
And Performance ◽  
Microstructure And Performance ◽  
Gh4169 Alloy ◽  
And Tungsten

Research on the Microstructure and Properties of Hypereutectic Al-Si Alloy for Semi-Solid Forming during Heat Treatment

2014 ◽  
Vol 887-888 ◽  
pp. 349-356
Author(s):  
Xiang Fan ◽  
Yi Tao Yang
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Solution Temperature ◽  
Heat Treatment Process ◽  
Aluminum Silicon Alloy ◽  
Liquid Line ◽  
And Performance ◽  
Semi Solid ◽  
Change Of Microstructure ◽  
Microstructure And Performance

The heat treatment process of a kind of hypereutectic aluminum silicon alloy which is suitable for semi-solid forming and the change of microstructure and performance during the process of heat treatment had been studied in this paper. In order to guide the heat treatment process, the phase diagram of the alloy had been calculated by the software of Thermo-Calc, and the theoretical solid and liquid line had been gotten. Twelve kinds of heat treatment process had been selected in this study. Finally the best process which the solution temperature is 495°C for 2h and aging temperature is 160°C for 8h had been gotten.

Influence of heat treatment on the microstructure and performance of high-velocity oxy-fuel sprayed WC–12Co coatings

2012 ◽  
Vol 206 (19-20) ◽  
pp. 4000-4010 ◽  
Author(s):  
Qun Wang ◽  
Luoxing Li ◽  
Guibin Yang ◽  
Xinqi Zhao ◽  
Zhangxiong Ding
Keyword(s):  
Heat Treatment ◽  
High Velocity ◽  
And Performance ◽  
Microstructure And Performance

Progress on Internal-Tin Route Nb3Sn Superconducting Strand for ITER in China

2013 ◽  
Vol 745-746 ◽  
pp. 158-162 ◽  
Author(s):  
Jian Wei Liu ◽  
Ke Zhang ◽  
Jian Feng Li ◽  
Sheng Liu ◽  
Xian De Tang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Critical Current ◽  
Cross Section ◽  
Axial Strain ◽  
Warm Up ◽  
And Performance ◽  
The Right ◽  
The University ◽  
Microstructure And Performance ◽  
Intrinsic Strain

Multi-filamentary Nb3Sn strand for ITER has been successfully fabricated by a conventional internal-tin (IT) route at Western Superconducting Technologies, Co. Ltd. All the performances of the IT Nb3Sn strand is able tomeet the ITER specifications. In 2010, one hundred kilograms of IT Nb3Sn strand has been cabled, jacketed and integrated into conductor sample titled with TFCN2 by ASIPP in China and tested in CRPP, Switzerland. After 1200 cycles warm-up and cooling down, Tcs of the TFCN2 Sultan sample at 10.78 T, 4.5 K are 6.35 K for the left leg and 6.37 K for the right leg, respectively, which is larger than the ITER lower limit of 5.7 K. This is the first successful Sultan sample made of Chinese Nb3Sn strand. In 2011, the influence of applied axial strain on critical current (Ic) was investigated using TFCN2 strand in the University of Twente, the Netherland. The irreversible degradation of Ic starts around +0.23% tensile intrinsic strain. The heat treatment influence of the duration at 650 °C on microstructure and performance was also studied. It was found that the fraction of un-reacted Nb after heat treatment is dependent on the position in the cross section. The hysteresis loss increases much faster than Ic when the duration at 650 °C increased.

scholarly journals Effect of Heat Treatment on the Microstructure and Performance of Cu Nanofoams Processed by Dealloying

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2691
Author(s):  
Jenő Gubicza ◽  
Péter Jenei ◽  
Gigap Han ◽  
Pham Tran Hung ◽  
Youngseok Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Performance ◽  
High Capacity ◽  
Lithium Ion ◽  
High Specific Surface Area ◽  
Cu Alloy ◽  
And Performance ◽  
Underlying Mechanisms ◽  
Microstructure And Performance

Cu nanofoams are promising materials for a variety of applications, including anodes in high-performance lithium-ion batteries. The high specific surface area of these materials supports a high capacity and porous structure that helps accommodate volume expansion which occurs as batteries are charged. One of the most efficient methods to produce Cu nanofoams is the dealloying of Cu alloy precursors. This process often yields nanofoams that have low strength, thus requiring additional heat treatment to improve the mechanical properties of Cu foams. This paper provides the effects of heat treatment on the microstructures, mechanical properties, and electrochemical performance of Cu nanofoams. Annealing was conducted under both inert and oxidizing atmospheres. These studies ultimately reveal the underlying mechanisms of ligament coarsening during heat treatment.

Effect of Strontium and T6 Heat Treatment on Structure and Performance of Al-11.6Si-0.5Mg Alloy

2013 ◽  
Vol 749 ◽  
pp. 1-6
Author(s):  
Ji Xing Lin ◽  
Jun Ping Zhang ◽  
Li Yuan Niu ◽  
Da Ren Sun ◽  
Zi Mu Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Eutectic Structure ◽  
Air Cooling ◽  
Water Cooling ◽  
T6 Heat Treatment ◽  
Sr Modification ◽  
Economic Process ◽  
And Performance ◽  
Microstructure And Performance

In this study, Strontium (Sr) was added as modifier during the casting of Al-11.6Si-0.5Mg alloy, and the effect of T6 heat treatment on microstructure and performance of alloy was also investigated. The results showed that the 0.3% Al-8%Sr master alloy can refine effectively the α-Al dendrite and eutectic structure; the best economic process of T6 heat treatment is solution at 535°C for 6 hrs., and water cooling at 50~60°C,aging at 160°C for 6 hrs , then air cooling. After Sr modification and T6 heat treatment, the mechanical properties of alloy are improved remarkably, i.e., the tensile strength increased to 348MPa from 183MPa before modification and the elongation raises from 3.0% to 6.5%. So this alloy is applied to the strain clamp products in electric power fitting industry.

scholarly journals Study on strong spinning preparation method and mechanism of the industrial pure titanium ultrafine crystallization

2019 ◽  
Vol 14 ◽  
pp. 155892501989525
Author(s):  
Yu Yang ◽  
Yanyan Jia
Keyword(s):  
Heat Treatment ◽  
High Performance ◽  
Pure Titanium ◽  
Grain Structure ◽  
Theoretical Research ◽  
Ultrafine Grain ◽  
Forming Process ◽  
Spinning Process ◽  
And Performance ◽  
Material Utilization

Ultrafine crystallization of industrial pure titanium allowed for higher tensile strength, corrosion resistance, and thermal stability and is therefore widely used in medical instrumentation, aerospace, and passenger vehicle manufacturing. However, the ultrafine crystallizing batch preparation of tubular industrial pure titanium is limited by the development of the spinning process and has remained at the theoretical research stage. In this article, the tubular TA2 industrial pure titanium was taken as the research object, and the ultrafine crystal forming process based on “5-pass strong spin-heat treatment-3 pass-spreading-heat treatment” was proposed. Based on the spinning process test, the ultimate thinning rate of the method is explored and the evolution of the surface microstructure was analyzed by metallographic microscope. The research suggests that the multi-pass, medium–small, and thinning amount of spinning causes the grain structure to be elongated in the axial and tangential directions, and then refined, and the axial fiber uniformity is improved. The research results have certain scientific significance for reducing the consumption of high-performance metals improving material utilization and performance, which also promote the development of ultrafine-grain metals’ preparation technology.

Surface microstructure and performance of TiN monolayer film on titanium bipolar plate for PEMFC

2021 ◽  
Author(s):  
Tao Li ◽  
Zhi Yan ◽  
Zhenzhen Liu ◽  
Yigang Yan ◽  
Yungui Chen
Keyword(s):  
Bipolar Plate ◽  
Surface Microstructure ◽  
Monolayer Film ◽  
And Performance ◽  
Microstructure And Performance
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