热变形对316LN奥氏体不锈钢微观组织和力学性能的影响

Effect of Hot Deformation on the Microstructure and Mechanical Properties of 316LN Austenitic Stainless Steel

利用Gleeble-1500热模拟试验机、光学显微镜、显微硬度计和纳米力学探针仪研究了温度、变形量和变形道次对316LN不锈钢组织和性能的影响。结果表明,试样3个变形区域的组织和显微硬度差距很大,难变形区变化最小,心部区域变化最大。统计分析不同试样的心部区域可知,大的变形量能得到细的晶粒和较高的显微硬度;高的变形温度能使材料充分再结晶;多道次变形后,试样的晶粒均匀性和圆整性得到改善;变形量为0.6时,1000℃下大变形后材料的纳米硬度和弹性模量高于原始材料,1200℃下则相反。

Effect of deformation temperature, strain and passes on the microstructure and mechanical property of 316LN austenitic stainless steel was studied by Gleeble-1500 thermomechanical simulator, optical microscopy （OM） and Nano Indenter II. The results showed that the difference of microstructure and mechanical property among specimensr three deformation zones was large. Study of centre zones of samples indicated that finer grain and higher microhardness of the samples can be got under bigger strain. Recrystallization of specimens became more sufficient with higher deformation temperature. The grains of the samples got uniformly distribution and more round after multipas- ses treatment. The microhardness and elasticity modulus of the sample deformed at 1000 ℃ were higher than those of original sample at the strain of 0. 6, but sample deformed at 1200 ℃ were adverse.