EFFECTS OF TEMPERING TEMPERATURE ON THE IMPACT TOUGHNESS OF STEEL 42CrMo

doi:10.3724/SP.J.1037.2012.00340

Acta Metall Sin

2012, Vol. 48

Issue (10): 1186-1193 DOI: 10.3724/SP.J.1037.2012.00340

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EFFECTS OF TEMPERING TEMPERATURE ON THE IMPACT TOUGHNESS OF STEEL 42CrMo

CHEN Jundan, MO Wenlin, WANG Pei, LU Shanping

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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CHEN Jundan MO Wenlin WANG Pei LU Shanping. EFFECTS OF TEMPERING TEMPERATURE ON THE IMPACT TOUGHNESS OF STEEL 42CrMo. Acta Metall Sin, 2012, 48(10): 1186-1193.

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Abstract

42CrMo heat–resistant steel is a kind of structural steel, which is widely used in structural components such as crane weight–on–wheel, automobile crank shaft, locomotive gear hub and so on, for its good hardening ability, high temperature strength, good creep resistance, and little quenching deformation. However, in industry application, mismatching between the strength and the toughness always occurs for 42CrMo structure components. In order to solve the problem that the strength does not match the toughness in the manufacturing process for the polar crane for the nuclear power station, the effect of tempering temperature on the morphology and distribution of carbides and the impact toughness has been investigated for steel 42CrMo in this study. The experimental results indicated that the microstructure of the quenched steel 42CrMo after 500—650 ℃ tempering was characterized by tempering sorbite. As the tempering temperature increased, the Charpy absorbed energy at –12℃ initially increased and then decreased. The flake carbides after 500 and 530 ℃ tempering are not evenly distributed on the original martensite boundaries, the Charpy absorbed energy are 26 and 44 J, respectively. While the granular carbides are evenly distributed in the microstructure after 600℃ tempering, the Charpy absorbed energy reaches a maximum value of 104 J. When the tempering temperature is higher than 600 ℃, granular carbides coarsened obviously and the Charpy absorbed energy reduced notably. The morphology and distribution of carbides is the key factor that influences the impact toughness of steel 42CrMo. Morphology and structure analysis for the carbide was carried out by TEM together with EDS analysis, the results showed that the carbide after tempering treatment is (Fe, M)3C and Fe, Cr, Mo are the main alloy element in the carbide. When the tempering temperature is in the range of 560—600 ℃, the uniformly–distributed granular carides forms on the matrix and the impact toughness is over 60 J. As the tempering temperature continues increasing, the carbides will coarsen and the impact toughness will decrease. In order to obtain the good strength and toughness matching, for 42CrMo structure, it is recommended that the tempering temperature should be in the range of 550—590 ℃.

Key words: tempering temperature steel 42CrMo Charpy absorbed energy carbide

Received: 08 June 2012

ZTFLH:

TG161

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Supported by Science and Technology Project of Liaoning Province (No.2010224008)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00340 OR https://www.ams.org.cn/EN/Y2012/V48/I10/1186

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