Effects of Tempering Temperature on Microstructure and Mechanical Properties of High-Strength Boron Steel

TAN Hailin; LAI Chunming; ZHOU Jialin; WANG Ming

doi:10.11973/jxgccl201708014

Materials and Mechanical Engineering > 2017 > 41(8): 63-66,92. > DOI: 10.11973/jxgccl201708014

TAN Hailin, LAI Chunming, ZHOU Jialin, WANG Ming. Effects of Tempering Temperature on Microstructure and Mechanical Properties of High-Strength Boron Steel[J]. Materials and Mechanical Engineering, 2017, 41(8): 63-66,92. DOI: 10.11973/jxgccl201708014

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Effects of Tempering Temperature on Microstructure and Mechanical Properties of High-Strength Boron Steel

1. Hunan Chemical Vocational Technology College, Zhuzhou 412011, China;
2. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
3. Wuhu Xinxing Ductile Iron Pipes Co., Ltd., Wuhu 241002, China

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Received Date: June 13, 2016
Revised Date: May 17, 2017

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Abstract

A high-strength boron steel was tempered at 200-600℃ after rolling and quenching, and then the effects of tempering temperature on the microstructure and mechanical properties of the steel were studied. The results show that with the increase of tempering temperature, the microstructure of the tested steel changed from needle-like martensite to lath-like martensite. The strength and hardness decreased while the elongation increased and the impact energy first increased then decreased and then increased. The obvious phenomenon of tempering brittleness of the tested steel appeared after tempering at 300-400℃, which was mainly caused by the precipitation of Fe-C-B type compound at the grain boundary.
- high-strength boron steel,
- tempering temperature,
- microstructure,
- mechanical property,
- tempering brittleness

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