Microstructure and Mechanical Properties of M50 Steel by Combining Cold Rolling with Austempering

被引：11
|
作者：
Qian, Dongsheng [1 ,2 ,3 ]
He, Yuangeng [1 ,2 ,3 ]
Wang, Feng [1 ,2 ,3 ]
Chen, Yun [4 ]
Lu, Xiaohui [2 ,3 ]
机构：
[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
[2] Hubei Key Lab Adv Technol Automot Components, Wuhan 430070, Peoples R China
[3] Hubei Engn Res Ctr Green Precis Mat Forming, Wuhan 430070, Peoples R China
[4] Wuhan Univ Technol, Sch Logist Engn, Wuhan 430070, Peoples R China
来源：
METALS | 2020年 / 10卷 / 03期
基金：
中国国家自然科学基金;
关键词：
M50; steel; cold rolling; martensite; bainite; impact toughness; BAINITIC STEEL; BEARING STEEL; MARTENSITE-TRANSFORMATION; DEFORMATION; AUSTENITE; TOUGHNESS; STRENGTH; DISSOLUTION; REFINEMENT; KINETICS;
D O I：
10.3390/met10030381
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and mechanical properties of M50 steel subjected to combining cold rolling (CR) with austempering are investigated. The microstructure is characterized using X‐ray diffraction and scanning and transmission electron microscopy. The mechanical properties are measured using the uniaxial tensile and Charpy impact tests. It is observed that an excellent combination of ultimate tensile strength (2536 MPa) and impact toughness (128 J) was achieved by combining austempering with CR; of which the ultimate tensile strength increased by 10% compared with traditional martensite quenching‐tempering (Q‐T) specimen and the impact absorbed energy exhibited 2.3 times of that in Q‐T specimen. The observation of the microstructure indicates that CR obviously refines the thickness of bainite sheaves, which is favorable for the formation of ultrafine equiaxed ferrite during tempering. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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页数：13
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