压铸模镶块的热疲劳失效行为

doi:10.13251/j.issn.0254-6051.2022.02.044

金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 250-256.DOI: 10.13251/j.issn.0254-6051.2022.02.044

压铸模镶块的热疲劳失效行为

蔡显杰^1,2, 吴博雅^1,2, 左鹏鹏^1,2, 黎军顽^1,2, 郭伟³

1.上海大学省部共建高品质特殊钢冶金与制备国家重点实验室, 上海 200072;
2.上海大学材料科学与工程学院, 上海 200072;
3.天津重型装备工程研究有限公司, 天津 300457

收稿日期:2021-08-20 修回日期:2021-12-28 出版日期:2022-02-25 发布日期:2022-04-01
通讯作者: 黎军顽,教授,E-mail: lijunwan@shu.edu.cn
作者简介:蔡显杰(1994—),男,硕士研究生,主要研究方向为模具钢热疲劳性能,E-mail: caixianjiefly@sina.com。
基金资助:
国家重点研发计划(2016YFB0300400); 上海大学省部共建高品质特殊钢冶金与制备国家重点实验室开放课题(SKLASS 2017-09)

Thermal fatigue failure behavior of die-casting insert

Cai Xianjie^1,2, Wu Boya^1,2, Zuo Pengpeng^1,2, Li Junwan^1,2, Guo Wei³

1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China;
2. College of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
3. Tianjin Heavy Equipment Engineering Research Co., Ltd., Tianjin 300457, China

Received:2021-08-20 Revised:2021-12-28 Online:2022-02-25 Published:2022-04-01

摘要/Abstract

摘要： 对工作1200模次发生热疲劳失效的压铸模镶块进行失效机理分析,同时建立了压铸过程的热-力耦合数值分析模型,研究了镶块在压铸服役过程中温度场和应力场的演变规律,并对其寿命进行预测。结果表明,镶块的失效是由于压铸过程中受到高温铝熔液的冲刷和冷却液的急冷引起的热疲劳行为所致;在循环压铸过程中,镶块凸台转角处出现应力集中,最大等效应力约为788 MPa,热疲劳裂纹在该处萌生和扩展;采用低周疲劳寿命预测模型对镶块热疲劳寿命进行预测,镶块热疲劳寿命约为1651次,与镶块实际热疲劳寿命非常吻合,这表明本文建立的热-力耦合数值模型可为压铸模镶块的可靠性设计提供借鉴。

关键词: 热作模具钢, 压铸模镶块, 热疲劳, 寿命预测, 数值模拟

Abstract: Failure mechanism of the thermal fatigue failed die-casting insert used for 1200 times was analyzed, and thermo-mechanical coupled numerical analysis model of die-casting process was established. The evolution of temperature and stress field of the die-casting insert during working was studied, and its service life was predicted. The results show that the failure of the insert is due to the thermal fatigue behavior caused by the erosion of high temperature molten aluminum liquid and the rapid cooling of the coolant during the die casting process. During the cyclic die-casting, the stress concentration occurs at the corner of the bulge of the insert, and the maximum equivalent stress is about 788 MPa, where the thermal fatigue crack initiates and propagates. The low cycle fatigue life prediction law is used to predict the thermal fatigue life of the insert, and the result is about 1651 times, which is in agreement with the actual life. The thermo-mechanical coupled numerical model in this paper can provide a reference for the reliability design of the die-casting insert.

Key words: hot work die steel, die-casting insert, thermal fatigue, life prediction, numerical simulation

中图分类号:

TG142.1

蔡显杰, 吴博雅, 左鹏鹏, 黎军顽, 郭伟. 压铸模镶块的热疲劳失效行为[J]. 金属热处理, 2022, 47(2): 250-256.

Cai Xianjie, Wu Boya, Zuo Pengpeng, Li Junwan, Guo Wei. Thermal fatigue failure behavior of die-casting insert[J]. Heat Treatment of Metals, 2022, 47(2): 250-256.

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压铸模镶块的热疲劳失效行为

Thermal fatigue failure behavior of die-casting insert

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