Evolution of the microstructure and mechanical properties of powder metallurgical high-speed steel S390 after heat treatment

被引：45
作者：
Peng, Hanlin [1 ]
Hu, Ling [2 ]
Li, Liejun [2 ]
Zhang, Liyun [1 ]
Zhang, Xianglin [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
[2] South China Univ Technol, Sch Mech & Automot Engn, 381 Wushan Rd, Guangzhou 510640, Guangdong, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 740卷
关键词：
Powder metallurgical alloy; Heat treatment; Microstructure; Mechanical property; Thermodynamic analysis; CARBIDE PRECIPITATION; SOLUBILITY PRODUCTS; VANADIUM-CARBIDE; WEAR BEHAVIOR; TEMPERATURE; MOLYBDENUM; ELEMENTS;
D O I：
10.1016/j.jallcom.2017.12.264
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The evolution of microstructure and mechanical properties of commercial powder metallurgical high-speed steel S390 steel after different heat treatments were studied. The results show that the austenitic transformation of the alloy starts at 1110 K (837 degrees C), whereas the martensite transformation starts at 624 K (351 degrees C). The density of hot isostatic pressed alloy is around 99.2 vol%, and the average pore size is less than 1 mu m. There are two types of metal carbides (MC): vanadium-rich MC-type and tungsten-rich M6C-type. After proper heat treatment, the alloys exhibit a high Rockwell-C hardness of 64.4 and compressive strength of 3870 MPa, as well as an ultra-large fracture strain of 22.7% under compression, which results from the changes in the size and distribution of the carbides during heat treatment. In addition, the experimental results concerning the dissolution of vanadium carbide varying with temperature are similar to the results obtained by thermodynamic analysis. Finally, for the experimental iron alloy, deep cryogenic treatment during the triple tempering treatment process has little effect on the compressive strength and room temperature hardness. (C) 2018 Elsevier B.V. All rights reserved.
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页码：766 / 773
页数：8
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