摘要
采用Gleeble-1500D热模拟机模拟高温压缩实验,研究奥氏体不锈钢06Cr19Ni9NbN在900~1200℃、应变速率0.005~0.5s-1变形条件下的热变形行为,通过对实验数据的分析,得到了该钢的流动应力曲线,高温塑性本构方程,热变形激活能,建立了06Cr19Ni9NbN钢动态再结晶动力学模型和动态再结晶晶粒尺寸模型,为优化高温条件下的锻造加工工艺提供理论依据。结果表明,当变形温度越高、变形速率越小时,越易发生动态再结晶,同时在能够发生动态再结晶的条件下,变形量越大,动态再结晶越充分。
Hot deformation behaviour of 06Cr19Ni9NbN austenitic stainless steel was studied by high temperature compression tests on a Gleeble-1500 D thermal simulation machine at 900-1200 ℃ and strain rate 0. 5 s- 1,0. 05 s- 1and 0. 005 s- 1. Through the analysis of experimental data,flow stress curve,high temperature plastic constitutive equation and the hot deformation activation energy of the steel were obtained, and the dynamic recrystallization kinetics model and dynamic recrystallization grain size model of the steel were established,to provide theoretical foundation for optimizing the forging process under high temperature conditions. It is found that higher deformation temperature,lower strain rate are advantageous to dynamic recrystallization. When dynamic recrystallization takes place, the fraction of dynamic recrystallization increases with the increase of strain.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第9期89-93,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51275330)
