Effect of Heat Treatment on Microstructures and Mechanical Properties of A356 Alloy by Low Pressure Casting

2015 ◽  
Vol 1096 ◽  
pp. 319-324
Author(s):  
Xiao Jian Yu ◽  
Ya Lin Lu ◽  
Fu Xian Zhu ◽  
Xing Cheng Li

Automobile wheel of A356 alloy was cast by low pressure casting process. The effect of heat treatment process on microstructures and mechanical properties of A356 alloy cast was discussed. The results indicated that optimal parameters of heat treatment process for A356 alloy included solution temperature of 535°Cand holding time of 4.5hours, aging temperature of 145°Cand holding time of 4hours. Ultimate strength of A356 is 270MPa and elongation rate is 10%. Meanwhile, the microstructure has been apparently improved. The eutectic silicon particle became more spheroidal and distributed uniformly in matrix.

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Yusuf Yusuf ◽  
Asep Ruchiyat ◽  
Muh Anhar

Steel is the material most widely used in the industry. To avoid wear and tear on steel, it is necessary to do heat treatment to improve the mechanical properties of the steel according to its application in the field. The increase in hardenability in metals can be determined by doing a hardenability test, namely the Jominy test method. The Jominy test is a method to determine the hardness value of metal using ASTM standards. This research was conducted with varying the distance of the nozzle of the sprayer to the lower end of the specimen, namely 10 mm, 12.5 mm, and 14 mm with a long spraying time of 15 minutes. The heat treatment process at temperature of 780oC and 90 minutes holding time. The averagehardness value of specimen number one (10 mm spraying distance) is 45.43 kgf, specimen number two (12.5 mm spraying distance) is 45.68 kgf, and specimen number three (14 mm spraying distance) is 44.31 kgf. The highest hardness value was specimen number two, there was an increase of 1.87 kgf (4.02%), according to ASTM standards where the spraying distance was 12.5 mm.Keywords: Steel, spraying distance, Jominy test.


2013 ◽  
Vol 765-767 ◽  
pp. 197-201
Author(s):  
Xiang Yu Xu ◽  
Xue Min Wang

The influence of chemical composition, heat treatment process and microstructure on the properties of E40 heavy plate have been studied. After normalization process of thick TMCP plate for high strength hull steel, the structure is substantially more regular, but the strength decreases. The former microstructure consists of lath-like bainite, but after heat treatment it consists of ferrite and pearlite. The mechanical properties meet the requirement of GB 712 prescript. With cooling rate decreasing, grain size in normalizing samples increases gradually, and the strength decreases. With the holding time extending, grain growth is not obvious, and the strength decreases. The best normalizing temperature is 910 °C, and the best holding time is about100 min.


2015 ◽  
Vol 1120-1121 ◽  
pp. 1109-1114
Author(s):  
Xin Lei ◽  
Hui Huang ◽  
S.P. Wen

This study investigated the mechanical properties and microstructures of Er-containing Al–Mg alloys. The research found that the H114-T sheet of Er-containing Al–Mg alloys showed a relative good comprehensive performance in mechanical properties. With the special rolling and heat treatment process, this H114-T sheet showed different morphology of microstructures with the other sheets in Er-containing Al–Mg alloys. Grains in H114-T sheet performed irregular shape polygon, a number of subgrains appeared in grains, the amount of dislocations in grains decreased. H114-T sheet possessed a lot of Copper texture, this may be one of important factors influenced the mechanical properties.


2007 ◽  
Vol 546-549 ◽  
pp. 825-828 ◽  
Author(s):  
Man Jin ◽  
Jing Li ◽  
Guang Jie Shao

The precipitation behaviors and microstructures of nano-precipitates in AA6082 Al-Mg-Si alloy with and without Cu additions during heat treatment process were studied using hardness measurements, TEM, mechanical tests and 3DAP. Meanwhile, the softening process of 6082 alloys with Cu and without Cu, isothermally conditioned at 250°C, has also been investigated. It was found that the rate of age hardening, mechanical properties and thermal stability are higher for the Cu-containing alloy. The TEM and 3DAP observations showed that Q’ precipitates were existed after aged at 170°C for 8h in the alloy with Cu addition. Comparing the hardness, mechanical properties and thermal stability curves, it was concluded that the Q’ precipitates play a major role in improving the age hardening kinetics and properties of 6082 alloy with Cu addition.


2021 ◽  
Vol 1035 ◽  
pp. 344-349
Author(s):  
Ye Qin Zhang ◽  
Ping Zhong ◽  
Huan Feng Li ◽  
Wen Qiang Zhang

The effect of solution temperature and aging temperature on mechanical properties and microstructure of the new ultrahigh strength stainless steel S280 was investigated by heat treatment process experiment. The results showed that the optimal heat treatment process was as follows: heating to 1080 °C,holding for a hour, and quenching in oil; cooling to -73 °C, holding for 2 hour, and warming in air to room temperature; heating to 540~550 °C, holding for 4 hour, and cooling in air. Choosing this heat treatment process, the steel can get good coordination between strength and toughness. Analyzed by HREM, the steel had desirable microstructures, which were fine lath martensite matrix with high density dislocation and finely dispersed precipitate strengthening phase, and film-like reversed austenite precipitated from the boundary of martensite.


2019 ◽  
Vol 264 ◽  
pp. 02001 ◽  
Author(s):  
Eduardo de Avila ◽  
Jaeseok Eo ◽  
Jihye Kim ◽  
Namsoo P. Kim

PMMA, PC, and PEEK are thermoplastic polymers that possess favorable properties for biomedical applications. These polymers have been used in fields of maxillo-facial, orthopedic, intraocular surgery, and bio-implant, due to their excellent mechanical properties, osteoinductive potential, and antimicrobial capabilities. In this study, the effect of heat treatment on the mechanical properties of 3D printed polymers was characterized. By modifying printing temperature and post heat treatment process, the mechanical properties were specifically tailored for different applications, correlating with the properties of the implants that are commonly made using molding processes.


2009 ◽  
Vol 23 (06n07) ◽  
pp. 906-913 ◽  
Author(s):  
LIANYONG ZHANG ◽  
YANHUA JIANG ◽  
ZHUANG MA ◽  
WENKUI WANG

Phase Transition Cooling (PTC), using the absorbed latent heat during the melting of phase transition cooling medium to cool and solidify alloys in the process of casting, is a new casting technology. Specimens of A356 casting aluminum alloy were prepared by this method in the paper. The new heat treatment process (cast and then aging directly without solid solution) of A356 alloy was performed. For comparison, the conventional T6 heat treatment (solution and then aging treatment) was performed too. The mechanical properties of A356 alloy with different heat treatments were measured by tensile strength testing methods and microstructures of the alloy with different heat treatment process were investigated by optical microscopy (OM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-rays diffraction (XRD) and transmission electron microscopy (TEM) too. The results show that ultimate tensile strength (UTS) of A356 alloy with the new heat treatment process is much higher than that with conventional heat treatment while the elongations with the two heat treatment processes are very close. This is due to the grain refinement obtained after PTC processing.


2016 ◽  
Vol 39 (5) ◽  
pp. 1604-1611 ◽  
Author(s):  
Mustafa Özgür Bora ◽  
Onur Çoban ◽  
Togayhan Kutluk ◽  
Sinan Fidan ◽  
Tamer Sinmazçe˙lk

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