摘要
测试了添加稀土元素和Ti、Nb的11%Cr铁素体不锈钢的力学特性,观察了退火后冲击试样的断口形貌,利用金相显微镜和透射电镜观察退火前后不锈钢的组织,分析加入稀土的铁素体不锈钢韧性变化原因。结果表明:退火前添加稀土比添加Ti、Nb的11%Cr铁素体不锈钢综合力学性能提升效果好;退火后添加稀土的11%Cr铁素体不锈钢为韧性断裂,这是由于稀土夹杂物在晶界上富集,起到钉扎效应。
Mechanical properties were tested on 11%Cr ferritic stainless steel with addition of rare earth （RE） , Ti and Nb, fracture morphologies of impact samples after annealing were observed, and microstructures were observed using metallographic microscope and TEM. Reasons for toughness change of 11% Cr ferritic stainless steel with RE were analyzed. Results indicate that comprehensive mechanical properties of 11%Cr ferritic stainless steel with RE before annealing are higher than those with Ti or Nb. Ductile fracture of annealed 11%Cr ferritic stainless steel results from RE inclusion enrichment on grain boundary which causes pinning effect.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2014年第2期34-37,共4页
Ordnance Material Science and Engineering
基金
宁波市重大科技攻关项目(2009B10011)
关键词
铁素体不锈钢
稀土
组织
性能
韧性
ferritic stainless steel
rare earth
microstructure
properties
toughness
