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

doi:10.13251/j.issn.0254-6051.2024.02.037

Abstract

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

CLC Number:

TG161

Chen Hao, Tu Yujie, Jiang Zhipeng, Wu Xiaochun. Numerical simulation and experiment on vacuum gas quenching of H11 steel large die cast module[J]. Heat Treatment of Metals, 2024, 49(2): 227-235.

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