316LN高氮超低碳奥氏体不锈钢的热变形行为和组织演变  

Hot Deformation Behavior and Structure Evolution of High Nitrogen Ultra-Low-Carbon Austenite Stainless Steel 316LN

作　　者：裴海祥[1,2] 曾莉[2,3] 王立新[2,3] 张海龙[1] 王西涛[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]山西太钢不锈钢股份有限公司技术中心,太原030003 [3]山西太钢不锈钢股份有限公司先进不锈钢材料国家重点实验室,太原030003

出　　处：《特殊钢》2014年第6期54-56,共3页Special Steel

基　　金：国家863计划项目资助(2012AA03A507)

摘　　要：试验的316LN钢(/%:0.011C,0.49Si,1.52Mn,0.016P,0.001S,16.65Cr,13.43Ni,2.18Mo,0.153N)为7.2 t铸锭初轧开坯并锻造成的φ180 mm圆钢。利用Gleeble-3800热模拟试验机研究了316LN钢在应变速率0.1~50 s^(-1)、1 050~1 200℃时的热变形行为和组织演变规律,并通过线性回归分析建立了316LN钢的本构方程。结果表明,变形温度升高有利于动态再结晶的形核,并在热变形过程中促进动态再结晶扩展;热变形过程材料常数α为0.0061,应力指数n为5.543 6,表观激活能550.512 kJ/mol,动态再结晶晶粒数量随着变形温度的增加而增多,到1 200℃变形时发生了完全的动态再结晶。The test steel 316LN （/%：0.011C,0.49Si, 1.52Mn,0.016P,0.001S, 16.65Cr, 13.43Ni,2.18Mo, 0. 153N） is Ф180 mm round bar forged and primary-rolled from 7.2 t ingot. The hot deformation behavior and structure evolution rule of steel 316LN with strain rate 0. 1 -50 s n at l 050 - 1 200℃ has been studied by using thermal-simulated test machine Gleeble-3800, and a constitutive equation of steel 316LN is established by linear regression analysis. Results show that increase of detormation temperature is favorable tor nucleation of dynamic recrystallization and promoting the development of dynamic recrystallization during hot deformation; in hot defiwmation process the material constant α is 0. 006 1, the stress exponent n is 5. 543 6 and the apparent activation energy is 550. 512 kJ/mol; with increasing deformation temperature the number of dynamic recrystallized grains in steel increases, and the complete dynamic reerystallization oceurs in steel deformed at 1 200℃.

关 键 词：316LN高氮超低碳奥氏体不锈钢 热变形 本构方程 动态再结晶 

分 类 号：TG142.71[一般工业技术—材料科学与工程]