La对17wt%Cr铁素体不锈钢组织和性能的影响
Effects of La on Microstructure and Properties of 17wt%Cr Ferritic Stainless Steel
李丽坤, 刘 实
点击：3646次 下载：0次
作者单位：中国科学院 金属研究所, 辽宁 沈阳 110016
中文关键字：La； 17wt%Cr铁素体不锈钢； 塑性应变比； 应变硬化指数； 电化学再活化率
英文关键字：La; 17wt%Cr ferritic stainless steels; plastic strain ratio; tensile strain hardening exponent; electrochemical
中文摘要：利用OM、SEM和TEM等观察分析了未添加La和添加La的17wt%Cr铁素体不锈钢的组织和第二相；测定了塑性应变比、应变硬化指数和电化学再活化率；确定了热轧再结晶的工艺参数。结果表明，两种合金中的主要第二相均为TiN；添加La后，合金铸态组织中存在柱状晶，热轧再结晶温度降低，塑性应变比得到提高，加工硬化性能和耐晶间腐蚀性能基本不变。
英文摘要：The microstructure and precipitates of 17wt%Cr ferritic stainless steels with and without La were analyzed by OM, SEM and TEM. The plastic strain ratio, tensile strain hardening exponent and electrochemical potentio-kinetic reactivation ratio were measured. The process parameters of recrystallization after hot-rolling were studied. The results show that the main precipitates in two alloys are both TiN. The as-cast samples with La contain columnar crystals. As a result of addition La, the temperature of recrystallization after hot-rolling declines; the plastic strain ratio of the alloy improves; the properties of work hardening and the resistance to intergranular corrosion are the same as the alloy without La.