AerMet100超高强度钢在热加工过程中的动态再结晶模型  

Dynamic Recrystallization Models of AerM et100 Ultrahigh-strength Steel During Thermo-mechanical Processing

作　　者：赵张龙[1] 闵晓楠 徐文馨 曹澜川 张鸽 宋旭阳 李晖[2] Zhao Zhanglong;Min Xiaonan;Xu Wenxin;Cao Lanchuan;Zhang Ge;Song Xuyang;Li Hui(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学材料科学与工程学院,陕西西安710072 [2]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2020年第10期3285-3293,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51974259);Natural Science Foundation of Shannxi Province(2019JM005)。

摘　　要：为了准确预测AerM et100超高强度钢在热加工过程中的微观组织演变,通过一系列等温热压缩试验,建立了包括动态再结晶(DRX)体积分数和DRX晶粒尺寸在内的DRX模型。分析了该合金在温度范围为800~1040℃和应变速率范围为0.01~10 s^-1的条件下变形15%~60%的热变形行为。通过计算获得了AerM et100钢本构模型中的Zener-Hollomon参数,建立了DRX模型。通过建立的DRX模型定量预测了热变形参数对该合金微观组织演变的影响。进一步观察微观组织发现,高温低应变速率和较大的变形程度有利于DRX的充分发生,使组织细化和均匀化。模型预测结果与实验结果吻合较好,验证了所建立的DRX模型的准确性。结果表明,DRX模型可以定量预测AerM et100钢构件在不同变形条件下进行热力学加工时的微观组织演变规律。In order to accurately predict the microstructure evolution during thermo-mechanical processing of AerMet100 ultrahigh-strength steel,the dynamic recrystallization(DRX)models including DRX volume fraction and DRX grain size were established by conducting a series of isothermal hot compression tests.The hot deformation behavior of the alloy in a wide range of temperatures from 800℃to 1040℃,strain rates from 0.01 s^-1 to 10 s^-1 and deformation degree from 15%to 60%was analyzed.The Zener-Hollomon parameter of the constitutive model for the AerM et100 steel was obtained to establish DRX models.The effects of deformation parameters on the microstructural evolution were quantitatively predicted through the established DRX models.The microstructure observation shows that higher temperature,lower strain rate and larger deformation degree are beneficial to the homogenization and refinement of the microstructure due to the occurrence of DRX.The good agreement between the prediction and the experiment validates the accuracy of the established DRX models,indicating that the DRX models can be used to quantitatively predict the microstructure evolution of AerMet100 steel components during thermo-mechanical processing under different hot deformation conditions.

关 键 词：AERMET100钢 动态再结晶 热变形 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]