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| Effects of Ni content and tempering temperatures on microstructure and properties of medium-carbon cast steel |
| Xiao-bo Cui1, Tian-long Liu2,3, Zhi-bin Zheng2,3,4, Zhi-qiang Guo1, Kai-hong Zheng2,3, Pei-xian Han4 |
| 1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China; 2 Institute of New Materials, Guangdong Academy of Sciences, National Engineering Research Center of Powder Metallurgy of Titanium and Rare Metals, Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510651, Guangdong, China; 3 Guangdong Provincial Iron Matrix Composite Engineering Research Center, Guangzhou 510651, Guangdong, China; 4 Jiangxi Lianfeng Investment Casting Co., Ltd., Yichun 336300, Jiangxi, China |
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Abstract The microstructure evolution and properties of medium-carbon cast steel alloyed with different Ni contents after tempering at various temperatures have been investigated. The addition of 0.47–1.59 wt.% Ni content results in the formation of 16%–36% retained austenite (RA). The blocky and irregular-polygonal RA mainly forms along the prior austenite grain boundaries, and the tempering temperature does not affect the RA content. The hardness of medium-carbon cast steel is affected by the precipitation of carbides and the hardness of martensite. Excessive RA content is the main cause of intergranular impact rupture and low impact energy. The long-strip carbides formed after tempering at 320 °C would further reduce the impact energy of medium-carbon cast steel. When tempering at 220 and 380 °C, the increase in impact energy is attributed to the formation of rod-like and spherical carbides and the low-carbon martensite. For the mediumcarbon cast steel with high impact energy, its impact-abrasive wear resistance is more excellent. Micro-cutting and delamination are the primary wear mechanisms.
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| Cite this article: |
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Xiao-bo Cui,Tian-long Liu,Zhi-bin Zheng, et al. Effects of Ni content and tempering temperatures on microstructure and properties of medium-carbon cast steel[J]. Journal of Iron and Steel Research International, 2023, 30(8): 1524-1536.
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2023, Vol. 30 
