周 舸,李鉴霖,门 月,张浩宇,车 欣,朱晓飞,陈立佳.涡轮盘用GH4742合金动态再结晶行为[J].稀有金属材料与工程,2021,50(4):1318~1324.[Zhou Ge,Li Jianlin,Men Yue,Zhang Haoyu,Che Xin,Zhu Xiaofei,Chen Lijia.Study on the Dynamic Recrystallization Behavior of GH4742 Superalloy[J].Rare Metal Materials and Engineering,2021,50(4):1318~1324.]
涡轮盘用GH4742合金动态再结晶行为
投稿时间:2020-05-18  修订日期:2020-07-18
中文关键词:  GH4742合金  动态再结晶  物理模型  热变形  微观组织
基金项目:国家自然科学基金资助(项目号××××)
中文摘要:
      采用单道次等温压缩实验获得了GH4742合金在变形温度为980~1100℃,应变速率为5×10-3 s-1~5 s-1条件下的应力-应变曲线。以实验数据为基础,运用KM模型、Poliak-Jonas准则、Avrami模型较为系统的描述了该合金动态再结晶过程的流变应力、临界应变量、组织演化动力学等特征。并在Prasad功率耗散率模型的基础上,将动态再结晶组织转变体积分数引入其中,获得了动态再结晶过程的能量变化规律,借助微观组织表征技术,揭示了该合金动态再结晶机理。研究结果表明:GH4742合金随着变形温度的升高和应变速率的降低,动态再结晶临界应变量减小,组织转变体积分数增加。发生完全动态再结晶时的功率耗散率大于0.44,形成机制为位错诱导的连续动态再结晶。
Study on the Dynamic Recrystallization Behavior of GH4742 Superalloy
英文关键词:GH4742  Dynamic recrystallization  Physical models  Hot deformation  Microstructure
英文摘要:
      The stress-strain curves of GH4742 at deformation temperature of 980-1100 °C and strain rate of 5×10-3 s-1 to 5 s-1 were acquired through single-pass isothermal compression experiments. The flow stress, critical strain capacity and structure evolution dynamics of GH4742 during dynamic recrystallization were systematically described on basis of experimental data using KM model, Poliak-Jonas criterion, and Avrami model. Then based on the Prasad power dissipation rate model, the structural transformation volume fraction was introduced to determine the energy variation rules during dynamic recrystallization. The mechanism underlying the dynamic recrystallization of GH4742 was revealed with the help of microstructure characterization. It was found the critical strain capacity of GH4742 during dynamic recrystallization decreased and the structural transformation volume fraction increased with the rise of deformation temperature or the decline of strain rate. The power dissipation rate of complete dynamic recrystallization was larger than 0.44, and the forming mechanism was dislocation-induced continuous dynamic recrystallization.
作者单位E-mail
周 舸 沈阳工业大学 材料科学与工程学院 zhouge@sut.edu.cn 
李鉴霖 沈阳工业大学 材料科学与工程学院  
门 月 沈阳工业大学 材料科学与工程学院  
张浩宇 沈阳工业大学 材料科学与工程学院  
车 欣 沈阳工业大学 材料科学与工程学院  
朱晓飞 沈阳工业大学 材料科学与工程学院  
陈立佳 沈阳工业大学 材料科学与工程学院  
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