金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 227-235.DOI: 10.13251/j.issn.0254-6051.2024.02.037

• 数值模拟 • 上一篇    下一篇

H11钢大型压铸模块真空气淬的数值模拟与试验

陈浩, 涂宇杰, 蒋志鹏, 吴晓春   

  1. 上海大学 材料科学与工程学院 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
  • 收稿日期:2023-08-29 修回日期:2024-01-05 出版日期:2024-03-27 发布日期:2024-03-27
  • 通讯作者: 吴晓春,教授,博士生导师, E-mail:wuxiaochun@shu.edu.cn
  • 作者简介:陈 浩(1997—),男,硕士研究生,主要研究方向为热作模具钢,E-mail:my.988@163.com。
  • 基金资助:
    省部共建高品质特殊钢冶金与制备国家重点实验室自主课题(SKLASS 2022-Z12)

Numerical simulation and experiment on vacuum gas quenching of H11 steel large die cast module

Chen Hao, Tu Yujie, Jiang Zhipeng, Wu Xiaochun   

  1. State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
  • Received:2023-08-29 Revised:2024-01-05 Online:2024-03-27 Published:2024-03-27

摘要: 采用数值模拟与试验相结合的方法研究了淬火压力对H11钢大模块(500 mm×500 mm×500 mm)真空气淬过程中的温度场、组织场和应力场的影响。结果表明,更大的淬火压力具有更好的冷却效果,但与此同时也会造成更大的淬火应力从而增加模块开裂的风险。模块整体的冷速随着淬火压力的增加而加快,在高温相变区(600~800 ℃),8 bar淬火压力模块心部的最大冷速为0.20 ℃/s,比4 bar淬火压力高0.06 ℃/s。8 bar和4 bar淬火压力下模块的最大应力分别为655 MPa和437 MPa。通过试验验证得知,4 bar淬火压力下模块心部出现了沿晶碳化物,故H11钢大模块真空气淬的过程中在600~800 ℃其心部冷速至少要≥0.16 ℃/s。

关键词: H11钢, 大模块, 气体淬火, 数值模拟

Abstract: Effect of quenching pressure on temperature field, microstructure field and stress field of the H11 steel module (500 mm×500 mm×500 mm) during air quenching were studied by combining numerical simulation with experiment. The results show that greater quenching pressure, better cooling effect, but at the same time, it also causes greater quenching stress which can increase the risk of cracking. The overall cooling rate of the module increases as the quenching pressure increases, in the high temperature transformation zone (600-800 ℃), the maximum cooling rate of the module core under quenching pressure of 8 bar is 0.20 ℃/s, which is 0.06 ℃/s higher than that of 4 bar. The maximum stress of the module under quenching pressure of 8 bar and 4 bar is 655 MPa and 437 MPa, respectively. Through experiment verification, the carbides precipitated along the grain boundary appear in the core of the module under quenching pressure of 4 bar, therefore during the gas quenching process of H11 steel large modules, the cooling rate at the core should be at least ≥ 0.16 ℃/s at 600-800 ℃.

Key words: H11 steel, large module, gas quenching, numerical simulation

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