42CrMo钢圆坯芯部热裂形成条件热模拟

doi:10.13228/j.boyuan.issn1006-9356.20230020

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Abstract The central crack is the main defect of large section continuous casting round blooms, which seriously affects the quality of blooms and rolled products. Due to the lack of quantitative criteria, the accurate prediction for central crack of bloom has become a difficult problem in metallurgy industry. Combined with numerical simulation and thermal simulation method of solidification process, the critical conditions of hot tearing formation in the center of 42CrMo steel continuous casting round bloom were studied, and its risk in the center of bloom was evaluated. Firstly, through finite element simulation, the cooling rate at the center of 42CrMo steel round bloom and the strain rate at the end of solidification were calculated under continuous casting conditions to provide control parameters for thermal simulation test. Furthermore, taking the center of bloom as the characteristic unit, using the hot tearing thermal simulator to reoccure its cooling rate and actively loading at the end of solidification, the critical conditions for hot tearing of 42CrMo steel under continuous casting conditions were obtained. The critical strain rate for hot tearing is 2.12×10^-4-2.82×10^-4 /s, the fracture temperature is around 1 452 ℃, and the fracture stress is 0.67 MPa. The comparison of numerical simulation and thermal simulation result shows that under the current continuous casting conditions, the risk of hot tearing in the center of bloom is high, and hot tearing is easily formed and propagated. This study also provides a new way of the assessment for hot tearing risk of continuous castings.

Key words： continuous casting hot tearing thermal simulation numerical simulation strain rate

Received: 12 January 2023

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	Articles by authors
	CHEN Meicheng
	ZHAO Yu
	GUO Qingtao
	LIN Zenghuang
	ZHONG Honggang
	ZHAI Qijie

Cite this article:

CHEN Meicheng,ZHAO Yu,GUO Qingtao等. Thermal simulation of hot tearing formation conditions in center of 42CrMo steel round bloom[J]. China Metallurgy, 2023, 33(6): 65-72.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20230020 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I6/65

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