Analysis on cold bending fracture of wear-resistant steel NM400

doi:10.13251/j.issn.0254-6051.2021.09.047

Abstract

Abstract: Aimed at the cold bending fracture in 20 mm thick NM400 plates, the cold bending process parameters, tensile properties, microstructure, inclusion types and size distribution were investigated to find the cause of fracture. The results show that bending fracture in NM400 plate is mainly caused by micron-size TiN inclusions. During the cold bending deformation, the stress concentration at the interface between inclusion and matrix leads to the nucleation and propagation of microcracks, and eventually leads to cold bending fracture. By reducing N content to below 4×10^-5, the cracking risk during cold bending process of NM400 steel is disappeared.

Key words: wear-resistant steel NM400, cold bending fracture, TiN inclusion, microstructure and properties

CLC Number:

TG142.1

Wu Hao, Deng Xiangtao, Li Chengru, Sui Yi, Zhang Tao, Ji Wenbo, Wang Zhaodong. Analysis on cold bending fracture of wear-resistant steel NM400[J]. Heat Treatment of Metals, 2021, 46(9): 262-267.

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