回火工艺对含Ce轴承钢440C组织性能影响

doi:10.13228/j.boyuan.issn1006-9356.20230146

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Abstract In order to investigate effects of different tempering processes on microstructure and properties of bearing steel 440C, effects of spheroidizing annealing-quenching-tempering process and spheroidizing annealing-quenching-tempering-cold treatment-tempering process on microstructure and properties of bearing steel 440C containing Ce were studied by means of SEM, XRD and TEM. The quenching temperature was 1 050 ℃, tempering temperature was 200 ℃ and cold treatment temperature was -78.5 ℃. The results show that the phase of steel is martensite + retained austenite + M₂₃C₆ carbide under the two processes. Compared with only spheroidizing annealing-quenching-tempering, the volume fraction of retained austenite in the test steel decreases from 11.06% to 7.63%, the size and quantity of primary carbides remain unchanged, the number of secondary carbides increases by 49.4%, and the average area decreases by 24.0% under the process conditions of spheroidizing annealing-quenching-tempering-cold treatment-tempering. In the aspect of mechanical properties, the impact energy increase from 90.5 J to 115.0 J, and the elongation after fracture increases from 5.3% to 8.3%. However, the tensile strength increases from 2 039.24 MPa to 2 060.14 MPa, and the Rockwell hardness increases from 58.70HRC to 59.09HRC. The transformation of mechanical properties is attributed to the combined action of microstructure and carbide. Under the experimental conditions, the spheroidizing annealing-quenching-tempering-cold treatment-tempering process is more beneficial to the improvement of toughness and plasticity of 440C bearing steel, but limited to the improvement of strength and hardness. This study provides a reference for the design of tempering process of 440C bearing steel.

Key words： 440C SA-Q-T-C-T process retained austenite secondary carbide mechanical property

Received: 15 March 2023

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	Articles by authors
	MA Shuai
	LI Yang
	JIANG Zhouhua
	SUN Meng
	MAO Yunqie
	MA Yanshuo

Cite this article:

MA Shuai,LI Yang,JIANG Zhouhua等. Effect of tempering process on microstructure and properties of bearing steel 440C containing Ce[J]. China Metallurgy, 2023, 33(8): 61-69.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230146 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I8/61

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