热变形条件下高氮CrMn型不锈钢的力学与组织行为  

Mechanical and Microstructural Behavior of CrMn Based Stainless Steel Containing High Nitrogen Under Hot Deformation Condition

作　　者：陈雷[1,2] 马筱聪[2] 王明家[3] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]燕山大学机械工程学院,河北秦皇岛066004 [3]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《热加工工艺》2014年第16期34-37,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51101136);河北省自然科学基金资助项目(E2012203013)

摘　　要：研究了高氮CrMn型不锈钢在温度950～1200℃,应变速率0.01～10 s^-1内热变形时的力学行为与动态组织演变规律。通过回归计算,得到了试验钢热变形激活能为320 kJ/mol,表观应力指数3.51,建立了热变形方程;得到了峰值应力（σp）、发生动态再结晶的临界应变（εc）与温度（T）、应变速率间（ε觶）的定量关系。结果表明,σp与εc均随T升高而降低,随着觶增加而增大。在1150℃、0.01 s^-1热变形条件下试验钢可获得均匀细小的完全动态再结晶组织。The mechanical and microstructure behavior of CrMn stainless steel with high nitrogen was investigated within the temperature of 950-1200℃ and strain rate of 0.01-10 s^-1. Based on the regression, the apparent activation energy（Q） and stress exponent（n） of the steel is about 320 kJ/mol and 3.51, respectively. The constitutive equation for hot deformation are determined as well as the quantity relationship among temperature（T）, strain rate（ε）, peak stress（σp） and critical strain（εc） for dynamic recrystalization（DRX）. The results show that σpand εcdecrease with increasing T while increasing with rising ε. Full DRX with uniform and fine can be obtained under the condition of 1150℃ and 0.01s^-1.

关 键 词：热变形方程 峰值应力 动态再结晶 动态再结晶 临界应变 

分 类 号：TG304[金属学及工艺—金属压力加工]