形变退火后铁素体不锈钢的晶界组成及腐蚀特性
Constitute and Corrosion Behaviors of Grain Boundary in Cold-rolled and Annealed Ferritic Stainless Steel
方晓辉, 时立迎
点击：3377次 下载：0次
作者单位：(东北电业管理局第一工程公司 焊接专业分公司, 辽宁 铁岭 112000)
中文关键字：形变退火； 晶界； EBSD； 铁素体不锈钢
英文关键字：strain and annealing; grain boundary; EBSD; ferritic stainless steel
中文摘要：采用电子背散射和SEM技术研究了经85%冷轧的铁素体不锈钢在1000 ℃退火过程中晶粒组织、取向织构和晶界取向差的变化规律以及晶界的腐蚀特性。结果表明，退火初期晶粒长大不显著；当退火时间达到2 h时，晶粒长大，平均晶粒尺寸达到65 μm，同时晶粒的｛100｝<hkl>织构明显增强，由此导致的小角度晶界比例提高。晶界腐蚀实验表明，小角度晶界具有较高的晶界腐蚀抗力。
英文摘要：The microstructure, grain orientation texture and misorientation were investigated using EBSD and SEM technology in cold-rolled and annealed ferritic stainless steel. The results show that, when the cold-rolled specimens with the thickness reduction of 85% are annealed at 1000 ℃ for varying time from 30 min to 2 h, grain size has little change at the early stage. The average grain size increases significantly after 2 h annealing, which reaches 65 μm. In the meanwhile, strong｛100｝<hkl> grain texture occurs and resulted in a high frequency of low angle grain boundaries, which posses better intergranular corrosion resistance.