高强度沉淀硬化不锈钢与K_(IC)和K_(ISCC)  

High strength precipitation-hardening stainless steel with KIC and KISCC

作　　者：李志 赵振业[1] 刘天琦[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2003年第z1期83-87,共5页Journal of Aeronautical Materials

摘　　要：分析了航空用沉淀硬化不锈钢的化学成分与力学性能之间特别是断裂韧度(K_(IC))和应力腐蚀门坎值(K_(ISCC))的关系,指出沉淀硬化不锈钢的K_(IC)和K_(ISCC)数值接近,而以二次硬化为主的不锈钢的K_(IC)和K_(ISCC)差别较大,表现出与高合金超高强度钢相同的特征。文章指出,因二次硬化引起基体中Cr,Mo含量的减少与K_(IC)和K_(ISCC)差别直接相关;由上述分析,引出超高强度不锈钢设计原则的初步构想。The relationship between compositions and mechanical properties (especially KIC and KISX) of aerospace high strength precipitation-hardening stainless steel has been analyzed. KIC and KISCC of high strength stainless steels with precipitation-hardening as main strengthening factor show the same data, while stainless steels with secondary hardening as main strengthening factor show different data, which expresses the same characteristics as high alloy ultrahigh-strength steels such AF1410. Decrease of elements such as Cr,Mo in martensite phase because of secondary hardening during tempering treatment is thought to lead to the difference between KIC and KISCC . Design principle of ultra high stainless steels has been advanced from above discussion.

关 键 词：高强度沉淀硬化不锈钢 断裂韧度(KIC) 应力腐蚀门坎值(KISCC) 二次硬化 

分 类 号：TG142.71[一般工业技术—材料科学与工程]