Effect of Tempering Temperature on Microstructure and Mechanical Properties of 35CrMo Steel

DAI Faming; JIANG Xin; WANG Lingxu; ZHANG Renqi; FAN Lei; HE Jinhang; XU Pingwei; LIANG Yu

doi:10.11973/jxgccl201809016

Materials and Mechanical Engineering > 2018 > 42(9): 73-77. > DOI: 10.11973/jxgccl201809016

DAI Faming, JIANG Xin, WANG Lingxu, ZHANG Renqi, FAN Lei, HE Jinhang, XU Pingwei, LIANG Yu. Effect of Tempering Temperature on Microstructure and Mechanical Properties of 35CrMo Steel[J]. Materials and Mechanical Engineering, 2018, 42(9): 73-77. DOI: 10.11973/jxgccl201809016

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Effect of Tempering Temperature on Microstructure and Mechanical Properties of 35CrMo Steel

1. Guizhou Electric Power Research Institute, Guiyang 550002, China;
2. Guizhou Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guizhou University, Guiyang 550025, China

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Received Date: August 02, 2017
Revised Date: August 19, 2018

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Abstract

35CrMo steel was quenched at 860 ℃ and then tempered at different temperatures (450, 500, 550, 600 ℃). The effect of tempering temperature on microstructure, tensile properties and fracture toughness was studied by universal testing machine and scanning electron microscope. The results show that with the increase of tempering temperature, the carbides precipitated from supersaturated α phase and were sphericized, and the lath feature of martensite disappeared gradually. The tensile strength and yield strength of the tested steel both decreased,while the elongation increased with the increase of tempering temperature. The tensile strength, yield strength and elongation of the tested steel tempered at 600 ℃ were 1 014 MPa, 933 MPa and 16.8%, respectively. With the increase of tempering temperature, the fracture toughness of the tested steel increased, and the fracture initiation zone changed from rapid crack initiation and propagation characteristics to more obvious plastic deformation characteristics.
- 35CrMo steel,
- tempering temperature,
- microstructure,
- tensile strength,
- fracture toughness

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