基于CA法的高温合金IN690管材挤压变形动态再结晶组织演变规律研究  

Micro-structure Evolution of Dynamic Recrystallization during Tube Extrusion of IN690 Superalloy Based on Cellular Automata

作　　者：王忠堂[1] 户金科 王羚伊[2] Wang Zhongtang Hu Jinke Wang Lingyi(Shenyang Ligong University, Shenyang 110159, China Shenyang Institute of Technology, Fushun 113122, China)

机构地区：[1]沈阳理工大学,辽宁沈阳110159 [2]沈阳工学院,辽宁抚顺113122

出　　处：《稀有金属材料与工程》2017年第9期2512-2516,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51575366)

摘　　要：采用元胞自动机(CA)方法对高温合金IN690管材挤压变形过程中动态再结晶组织演变规律进行了数值模拟研究。确定了位错密度模型、回复模型、形核模型、晶粒长大模型等。分析了挤压变形过程中动态再结晶的过程,得到了变形过程中的晶粒形态、分布、取向和尺寸。结果表明,在相同挤压比条件下,管壁外部的平均晶粒尺寸小于管壁中部;在管材的相同部位,随着挤压比的增大,平均晶粒尺寸减小。平均晶粒尺寸的数值模拟结果与实验结果的相对误差小于16.6%。Dynamic recrystallization of IN690 superalloy during tube extrusion has been simulated based on Cellular Automata（CA）. The model of dislocation density and model of reply and model of nucleation and model of grain growth were determined. Morphology,distribution,orientation and size of grains during the process of deformation were obtained through dynamic recrystallization analysis. The results show that the grain size of the external wall is smaller than that of the middle under the same extrusion ratio. With the increasing of extrusion ratio,the grain size at the same site of the tube decreases. The relative errors of the grain sizes of simulation and experiment are less than 16.6%.

关 键 词：高温合金 IN690 元胞自动机 动态再结晶 晶粒尺寸 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG376.9[金属学及工艺—合金]