基于实测TTT曲线的H11钢模块可淬透厚度仿真计算与验证

涂宇杰; 石正波; 徐晨; 孟佳杰; 陈雪芬; 徐琅; 吴晓春

doi:10.3969/j.issn.1674-6457.2025.12.012

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (12) : 113-123. DOI: 10.3969/j.issn.1674-6457.2025.12.012

航天先进制造技术

基于实测TTT曲线的H11钢模块可淬透厚度仿真计算与验证

涂宇杰^1,*, 石正波¹, 徐晨¹, 孟佳杰¹, 陈雪芬¹, 徐琅¹, 吴晓春²

作者信息 +

Simulation and Validation of Quenchable Thickness for H11 Steel Modules Based on Measured TTT Curve

TU Yujie^1,*, SHI Zhengbo¹, XU Chen¹, MENG Jiajie¹, CHEN Xuefen¹, XU Lang¹, WU Xiaochun²

Author information +

文章历史 +

摘要

目的准确预测H11钢模块在不同淬火方式下的可淬透厚度,为航天装备的生产应用提供理论依据。方法采用DI805A热膨胀仪测定了H11钢准确的等温转变（TTT）曲线,并基于该曲线建立了相变计算模型,然后结合有限元仿真的方法,模拟了不同厚度的H11钢模块（200~700 mm）在油淬和气淬2种淬火方式下温度和组织的演变过程,并对模块的可淬透厚度进行了理论预测,最后利用真空气淬炉对500 mm模块进行了气淬工业试验验证。结果相变特性试验结果表明,H11钢过冷奥氏体在等温转变过程中会发生珠光体和贝氏体转变,相变温度区间分别为675~790 ℃和295~395 ℃。淬火仿真结果表明,当油淬条件下模块厚度超过500 mm和气淬条件下模块厚度超过400 mm时,模块心部冷却速度不足以抑制贝氏体转变,导致出现明显体积分数的贝氏体组织。工业试验结果表明,500 mm模块心部实测获得的温度曲线、显微组织类型和贝氏体体积分数与仿真结果较为吻合。结论 H11钢模块的可淬透厚度油淬为500 mm左右,气淬为400 mm左右。

Abstract

The work aims to have accurate prediction of the quenchable thickness of H11 steel modules under different quenching processes to provide theoretical support in the production of aerospace equipment. The precise time-temperature- transformation (TTT) curve of H11 steel was determined with a DI805A dilatometer. Based on this curve, a phase transformation calculation model was established. Subsequently, the evolution of temperature and microstructure in H11 steel modules of different thickness (200-700 mm) under oil quenching and gas quenching was simulated using a finite element method, and the quenchable thickness was theoretically predicted. Finally, an industrial gas quenching trial on a 500 mm module was carried out in a vacuum gas quenching furnace for validation. The phase transformation characteristics tests revealed that the supercooled austenite of H11 steel underwent pearlite and bainite transformations during isothermal holding, within temperature ranges of 675-790 ℃ and 295-395 ℃, respectively. The quenching simulation results indicated that for modules thicker than 500 mm under oil quenching and thicker than 400 mm under gas quenching, the cooling rate at the core was insufficient to suppress bainite transformation, leading to the formation of a significant volume fraction of bainite. The results of industrial trial showed that the measured temperature curves, types of microstructure, and volume fraction of bainite at the core of the 500 mm module aligned well with the simulation results, confirming their consistency. The quenchable thickness of H11 steel modules is approximately 500 mm for oil quenching and 400 mm for gas quenching.

导出引用

涂宇杰, 石正波, 徐晨, 孟佳杰, 陈雪芬, 徐琅, 吴晓春. 基于实测TTT曲线的H11钢模块可淬透厚度仿真计算与验证[J]. 精密成形工程. 2025, 17(12): 113-123 https://doi.org/10.3969/j.issn.1674-6457.2025.12.012

TU Yujie, SHI Zhengbo, XU Chen, MENG Jiajie, CHEN Xuefen, XU Lang, WU Xiaochun. Simulation and Validation of Quenchable Thickness for H11 Steel Modules Based on Measured TTT Curve[J]. Journal of Netshape Forming Engineering. 2025, 17(12): 113-123 https://doi.org/10.3969/j.issn.1674-6457.2025.12.012

中图分类号： TG161

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