Effect of Ni on microstructure and mechanical properties of 30CrMnSi2 steel

doi:10.13251/j.issn.0254-6051.2022.11.032

Abstract

Abstract: Microstructure and properties of 30CrMnSi2 steel with different Ni contents after tempering at low temperature were studied. The results show that the microstructure of the tested steel consists of tempered lath martensite and M/A islands. With the increase of Ni content, the M/A islands are significantly refined, and changing from islands to elongated strips. The impact fracture is ductile fracture, with the increase of Ni content, the ductile area of the fracture increases, the equiaxial dimple deepens, the number of dimples increases, and the impact absorbed energy increases. When the Ni content is greater than 1.0%, the increasing trend of impact absorbed energy decreases. The tested steel with 1.0%Ni has the highest strength, good toughness and plasticity, and the best comprehensive properties.

Key words: 30CrMnSi2 steel, Ni content, lath martensite, microstructure, mechanical properties

CLC Number:

TG142.1

Ma Jinwei, An Shengli, Jia Li, Fu Xueyi, Xue Rui, Gao Zhanyong. Effect of Ni on microstructure and mechanical properties of 30CrMnSi2 steel[J]. Heat Treatment of Metals, 2022, 47(11): 178-183.

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