Transverse Impact Toughness and Its Main Influencing Factors of Large Size 42CrMoS Steel Rod

LAI Chengban; ZHANG Yanni; MIN Yongan; ZHOU Kun

doi:DOI: 10.11973/jxgccl202303010

Materials and Mechanical Engineering > 2023 > 47(3): 55-59,65. > DOI: DOI: 10.11973/jxgccl202303010

LAI Chengban, ZHANG Yanni, MIN Yongan, ZHOU Kun. Transverse Impact Toughness and Its Main Influencing Factors of Large Size 42CrMoS Steel Rod[J]. Materials and Mechanical Engineering, 2023, 47(3): 55-59,65. DOI: DOI: 10.11973/jxgccl202303010

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Transverse Impact Toughness and Its Main Influencing Factors of Large Size 42CrMoS Steel Rod

1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. Jiangsu Zhuhong Forging Co., Ltd., Wuxi 214154, China

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Received Date: December 27, 2021
Revised Date: November 20, 2022

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Abstract

Samples were taken from different parts of the forged 42CrMoS steel bar with a diameter of 380 mm, and then were treated by water cooling quenching or air cooling quenching and high temperature tempering with the same process. The microstructure, morphology and quantity of sulfide inclusions and their effects on the transverse impact toughness after heat treatment were studied. The results show that there was no serious element segregation in the steel bar. The transverse impact absorption energy of different parts under water cooling quenching and air cooling quenching conditions was 21.6-35.6 J and 12.7-17.7 J, respectively. The morphology of sulfides in the steel bar had more significant influence on the transverse impact toughness than the quantity. The fine and uniformly distributed point sulfide had relatively little adverse effect on the transverse impact toughness. When every 10% area fraction bainite was introduced into the microstructure of the air cooling quenched and high temperature tempered samples, the transverse impact absorption energy decreased by about 6%, and the degree of the influence of tempered sorbite on the transverse impact toughness was about 2.5 times that of the bainite.
- 42CrMoS steel,
- transverse impact toughness,
- sulfide inclusion,
- microstructure

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