摘要
以GH4049高温合金在变形温度为1060~1180℃、应变速率为0.1~50 s^-1范围内的等温压缩实验为基础,通过获得的真应力-真应变曲线预测了合金不同热变形条件下的动态再结晶体积分数。基于金属变形过程中的应变硬化、动态回复和动态再结晶软化平衡原理,分析了GH4049高温合金的流变行为,建立了合金热变形过程中动态再结晶临界应变、峰值应变与Zener-Hollomon参数的关系式;通过计算GH4049高温合金不同热变形条件下的动态再结晶体积分数,建立了合金动态再结晶体积分数的Avrami模型,量化预测出GH4049高温合金热变形中的动态再结晶发生比例。动态再结晶体积分数预测值与微观组织实验测试结果一致,证明了GH4049高温合金动态再结晶体积分数预测模型的准确性,可以用于GH4049高温合金工程应用中的动态再结晶预测。
On the basis of the isothermal compression experiments of GH4049 superalloy at the deformation temperature of 1060-1180℃and strain rate of 0.1-50 s^-1,the dynamic recrystallization(DRX)volume fraction of the alloy under different hot deformation conditions was predicted by the obtained true stress-true strain curves.Based on the balance principle of strain hardening,dynamic recovery and DRX softening,the flow behavior of GH4049 superalloy was analyzed and the relationship between DRX critical strain,peak strain and Zener-Hollomon parameter of the alloy during hot deformation process was established.Through calculating the DRX volume fraction of GH4049 superalloy under different hot deformation conditions,the Avrami model of DRX volume fraction was established to quantitatively predict the DRX occurrence proportion of GH4049 superalloy during hot deformation.The predicted DRX volume fraction values are in constant with the testing results of microstructure experiment,which proves the accuracy of the DRX volume fraction prediction model of GH4049 superalloy and the model can be used to predict the DRX of GH4049 superalloy during actual engineering application.
作者
王涛
闵晓楠
李钊
万志鹏
谭千辉
赵张龙
WANG Tao;MIN Xiao-nan;LI Zhao;WAN Zhi-peng;TAN Qian-hui;ZHAO Zhang-long(Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China;Shanxi Fenglei Drilling Tools Co.,Ltd.,Houma 043009,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第7期64-71,共8页
Journal of Plasticity Engineering
基金
陕西省自然科学基金资助项目(2019JM005)
装备预研重点实验室基金资助项目(6142903200206)。
