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Open AccessArticle

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

by Dongsheng Qian 1,2,3, Yuangeng He 1,2,3, Feng Wang 1,2,3, Yun Chen 4,* and Xiaohui Lu 2,3
1
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan 430070, China
3
Hubei Engineering Research Center for Green Precision Material Forming, Wuhan 430070, China
4
School of Logistics Engineering, Wuhan University of Technology, Wuhan 430070, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(3), 381; https://doi.org/10.3390/met10030381
Received: 21 February 2020 / Revised: 13 March 2020 / Accepted: 14 March 2020 / Published: 16 March 2020
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. View Full-Text
Keywords: M50 steel; cold rolling; martensite; bainite; impact toughness M50 steel; cold rolling; martensite; bainite; impact toughness
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Qian, D.; He, Y.; Wang, F.; Chen, Y.; Lu, X. Microstructure and Mechanical Properties of M50 Steel by Combining Cold Rolling with Austempering. Metals 2020, 10, 381.

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