Microstructure-property regulation of NM400 grade wear-resistant steel with 0.5%Mo addition

doi:10.13251/j.issn.0254-6051.2025.04.010

Abstract

Abstract: Effect of 0.5%Mo addition on the microstructure, phase transformation behavior, and mechanical properties of NM400 grade wear resistant steel was investigated through optical microscope (OM), electron backscatter diffraction (EBSD), and JMatPro software analysis. The results demonstrate that the Mo addition significantly enhances the hardenability of the tested steel, enabling the formation of lath martensite at lower cooling rates, and with the increase of precipitation of M₂C carbides, the refinement of hierarchical microstructure is significant, thereby improving grain refinement strengthening and solution strengthening effects. Compared with the steel without Mo addition, the 0.5%Mo steel exhibits enhanced yield strength and tensile strength reaching 996.6 MPa and 1350.0 MPa, respectively, while maintaining good plasticity, though accompanied by a slight reduction in total elongation.

Key words: wear-resistant steel, Mo element, hardenability, microstructure

CLC Number:

TG162.83

Ma Ruijie, Xu Lixiong, Zhang Yi, Pi Xinyu. Microstructure-property regulation of NM400 grade wear-resistant steel with 0.5%Mo addition[J]. Heat Treatment of Metals, 2025, 50(4): 72-79.

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