Cause analysis and optimization suggestions for low-impact energy in stainless steel 316LN at ultralow temperatures  

作　　者：CHEN Xu WANG Zhiyu 

机构地区：[1]Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China

出　　处：《Baosteel Technical Research》2024年第4期20-26,共7页宝钢技术研究(英文版)

摘　　要：The detailed reasons for the low impact energy of stainless steel 316LN were investigated through optical microscopy,EDS,and EBSD techniques.The results indicated that the massiveσphase with brittle properties precipitated in the center layer of 316LN was the main cause of the relatively low impact energy observed in the experiment.According to calculations using Thermo-Calc software,theσphase in the center layer precipitated from theδferrite following prolonged hot deformation and annealing at 700-950℃.However,theδferrite andσphase could be eliminated through proper thermo-mechanical treatments,which would improve the impact properties at ultralow temperatures.

关 键 词：stainless steel 316LN impact toughness σphase δferrite 

分 类 号：TG1[金属学及工艺—金属学]