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