压缩载荷下夹杂物对低密度钢应力场的影响

doi:10.13228/j.boyuan.issn0449-749x.20210755

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Abstract Crack initiation and growth are usually caused by non-metallic inclusions (NMI) during the rolling process, and it is necessary to study the effects of NMIs on the mechanical properties of low-density steel. The influences of typical NMIs such as single Al₂O₃, MnS, AlN, TiN and Al₂O₃-AlN、AlN-MnS complex NMIs on the stress field in low-density steel were investigated using Abaqus software, and then the effects of type, size, direction, distribution of NMIs on stress field were also studied. The results show that the deformability, shape, and size of NMIs significantly affect the distribution of stress field, and the maximum stress value caused by NMIs and nearby matrix are TiN, AlN, Al₂O_3, and MnS in descending order. The maximum stress value and range of stress field are positively associated with the size of NMI. Moreover, the angle between the longitudinal axis of NMI and loading direction affects the crack initiation location and propagation direction. As for TiN and AlN inclusions, the sharp corner located in the loading direction can inhibit the stress concentration. In addition, the aggregated NMIs are more likely to cause the stress concentration, and the maximum stress value has a negative correlation in the distance of NMIs. For Al₂O₃-AlN complex inclusion, the internal Al₂O₃ could prevent deformation of complex inclusion and increase the stress value, and increase the harmfulness of AlN. However, for AlN-MnS complex inclusion, the stress concentration in corner of AlN could be relieved by externally wrapping with MnS inclusion, and the harmfulness of AlN could be decreased. Therefore, to decrease the harmfulness of NMIs on properties of low-density steel, the number and size of brittle NMIs and aggregated AlN should be controlled, and the damage of AlN inclusion to be reduced by AlN-MnS complex inclusion.

Key words： low-density steel Fe-Mn-Al-C non-metallic inclusion stress field finite element simulation compressive loading

Received: 07 December 2021

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	Articles by authors
	GUO Shuai
	ZHU Hang-yu
	ZHOU Jie
	DONG Shuai
	LIANG Yin

Cite this article:

GUO Shuai,ZHU Hang-yu,ZHOU Jie等. Effects of inclusions on stress field in low-density steel under compressive loading[J]. Iron and Steel, 2022, 57(7): 63-72.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210755 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I7/63

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