冷却模式对NM400相变塑性及残余应力的影响

doi:10.13228/j.boyuan.issn0449-749x.20220591

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Abstract Rapid cooling after rolling has become essential for preparing wear-resistant steel NM400. However,the rapid cooling introduces high-amplitude residual stress in the strip,leading to plate defects and distortions during subsequent processing and use. Therefore,clarifying the phase transformation behavior of NM400 and the effect of the cooling rate on its phase transformation behavior is the key to intervening in the phase transformation behavior and improving the level and distribution of residual stress. Aiming at plate shape difference caused by the two cooling modes adopted in the continuous cooling process,the temperature field and stress-strain field were calculated to reveal the effect of cooling mode on phase transformation plasticity and residual stress of NM400 through thermal simulation experiments,the crack compliance method based on the principle of fracture mechanics and the establishment of ABAQUS finite element simulation model. The results show that the formation of residual stress in the continuous cooling process is divided into three stages,the dominant stage of thermal stress,the dominant stage of surface transformation and the dominant stage of core transformation. The size and direction of phase transformation plastic strain are directly related to the stress loaded at the moment of phase transformation. At the beginning of phase transformation in the core,increasing the cooling rate will increase the volume percent of the phase transformation on the surface. The larger the volume percent is,the larger the tensile stress and the phase transformation plastic strain are,the superposition of which will introduce high-amplitude residual stress in the material. The research results can provide data basis and theoretical basis for the regulation of residual stress in the continuous cooling process of wear-resistant steel NM400.

Key words： cooling mode wear-resistant steel continuous cooling residual stress transformation plasticity

Received: 14 September 2022

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	Articles by authors
	FANG Yu
	DING Wen-hong
	LIANG Liang
	WANG Jing
	LU Xiao-xuan
	PENG Chong

Cite this article:

FANG Yu,DING Wen-hong,LIANG Liang等. Effect of cooling mode on transformation plasticity and residual stress of NM400[J]. Iron and Steel, 2023, 58(4): 116-125.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220591 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I4/116

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