铸轧薄带的边部斜裂纹形成机理

doi:10.13228/j.boyuan.issn0449-749x.20190412

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Abstract In order to improve the quality of cast-rolled strip products and reduce the risk of strip breakage caused by intrinsic cracks in the cast-rolling process. The oblique crack at the edge of the cast-rolled strip was studied to derive the formation mechanism of oblique crack in the edge:the heat exchange between the side seal and the molten pool makes the Kiss point height on the side of the pool locally elevated,leading to the local increase of the initial thickness of the thin strip in the plastic deformation stage of casting-rolling. Therefore,the oblique shear stress induced in the plastic deformation zone of the thin strip becomes the main reason for the formation of the oblique crack on the edge. A thermal-flow coupling numerical simulation model was established to analyze the distribution law of Kiss height along the width of the rollers in the molten pool. The results show that the Kiss point height on the edge of the pool is higher than that near the center of the pool. A thermally-mechanical coupling numerical simulation model was established to analyze the stress distribution in the plastic deformation zone of a thin strip with variable thickness during hot rolling. The shear stress analysis shows that the oblique shear stress is concentrated on the side of the backward slip zone in the plastic deformation zone,and its direction is consistent with the flow direction of the metal in the backsliding zone. A thermal-mechanical coupling numerical simulation model was established to analyze the stress distribution in the plastic deformation zone of the thin strip with a varying thickness during hot rolling. The analysis shows that the oblique shear stress is concentrated on the edge of the backward slip zone,and its direction is consistent with the flow direction of the metal there. The above simulation results verify the rationality of the formation mechanism.

Key words： edge oblique crack cast-rolling stress analysis Kiss point numerical simulation

Received: 14 October 2019

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	Articles by authors
	SUN Ming-han
	ZHU Zhi-wang
	ZHENG Li-kang
	ZHENG Chuan-xing
	DU Feng-shan

Cite this article:

SUN Ming-han,ZHU Zhi-wang,ZHENG Li-kang等. Mechanism of oblique edge crack formation of cast-rolling strip[J]. Iron and Steel, 2020, 55(4): 60-67.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190412 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I4/60

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