Microstructure and properties of non-quenched and tempered steel with high nitrogen content

doi:10.13251/j.issn.0254-6051.2023.06.033

Abstract

Abstract: Microstructure and properties of three 45MnVS-based non-quenched and tempered steels with different vanadium and nitrogen contents were studied by using EBSD, TEM and performance test, etc. The results show that by increasing the N content, the precipitation of V(C, N) and VN can be promoted, and the significant grain refinement effect can be obtained with a large number of fine and dispersed precipitates as the nucleation sites to promote the pearlite transformation and pin the grain boundary. The high nitrogen non-quenched and tempered steel has good combination of strength and toughness, the yield strength reaches 580 MPa, and the impact absorbed energy reaches 57 J, when it is produced with the process of holding at 1150 ℃ for 60 min, and then initial rolling at 1000 ℃, final rolling at 900 ℃.

Key words: non-quenched and tempered steel, nitrogen, vanadium precipitation, grain refinement

CLC Number:

TG142.1

Mu Xianglin, Chao Yuelin, Ma Yue, Sun Qisong, Cheng Sihua, Liu Kun. Microstructure and properties of non-quenched and tempered steel with high nitrogen content[J]. Heat Treatment of Metals, 2023, 48(6): 186-190.

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