Separative and Comprehensive Effects of Grain Coarsening and Grain Refinement of Ni-38Cr-3.8Al Alloy during Thermal Deformation Process

作     者：Quan, Guozheng Zhao, Yifan Deng, Qi Quan, Mingguo Yu, Yanze Wu, Daijian 

作者机构：Chongqing Univ Sch Mat Sci & Engn Chongqing Key Lab Adv Mold Intelligent Mfg Chongqing 400044 Peoples R China Jiangsu Yutaida Ind Technol Co Ltd Taizhou 225300 Peoples R China Huan Ding Intelligent Technol Suzhou Co Ltd Suzhou 215000 Peoples R China Sichuan Polytech Univ Sichuan Lab Adv Mfg Technol Press Engine Deyang 618000 Peoples R China 

出 版 物：《MATERIALS》 (材料)

年 卷 期：2024年第17卷第9期

页      面：1965页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Sichuan Science and Technology Program 

主　　题：nickel-based alloy grain growth dynamic recrystallization grain coarsening grain refinement kinetics model 

摘      要：During thermal deformation, grain coarsening due to grain growth and grain refinement resulting from dynamic recrystallization (DRX) collectively influence the deformed grain size. To investigate the separative and comprehensive effects of the two mechanisms in the Ni-38Cr-3.8Al alloy, grain growth experiments and isothermal compression tests were conducted. Kinetics models for grain growth and DRX behaviors were established based on the experimental data, which were integrated with finite element (FE) techniques to simulate the evolution of grain size throughout the entire thermal compression process. The effects of grain coarsening and grain refinement during this process were separated and quantified based on the simulation data. The results revealed that grain coarsening predominated during the heating and holding stages, with a longer holding time and higher holding temperatures intensifying this effect. However, during the compression stage, grain coarsening and grain refinement co-existed, and their competition was influenced by deformation parameters. Specifically, grain refinement dominated at strain rates exceeding 0.1 s(-1), while grain coarsening dominated at lower strain rates (1373 K). The simulated grain sizes closely matched the experimental observations.