摘要
国产１８Ｎｉ（３５０）马氏体时效钢在温度９０℃，ＵＦ６压力６．７ｋＰａ条件下，其应力腐蚀临界应力场强度因子ＫＳＣＣ值为１０１３±９９Ｎ／ｍｍ３／２。还给出３种初始应力水平：８８２，６８６，４９０Ｎ／ｍｍ３／２下其断裂韧性Ｋｃ与腐蚀时间ｔ的关系。随ｔ的增加Ｋｃ都有下降趋势，皆服从半对数规律。对不同杂质元素含量的马氏体时效钢做了对比试验。结果表明杂质Ｓ、Ｃ、Ｎ含量是影响ＫＳＣＣ的主要因素。如控制在０．００２％以下，ＫＳＣＣ可望提高４０％。
The critical stress intensity factor K SCC of maraging steel at 90℃ at UF 6 pressure of 6.7 kPa was measured and the relation between fracture toughness K c and exposure time t was established.K C decreased with t. Relation between K C and t conformed to half logarithm law. To find a method improving K SCC of 18Ni (350) maraging steel, contrast stress corrosion tests were made for maraging steel with different impurity contents. Results showed that sulphur impurity contents was a main factor to affect K SCC . The K SCC can also be affected by c C and c N. If c S , c C and c N all are not above 0.002%, K SCC may increase by 40%.
出处
《腐蚀科学与防护技术》
CAS
CSCD
1996年第3期206-209,共4页
Corrosion Science and Protection Technology
关键词
马氏体时效钢
应力腐蚀
杂质
含量
maraging steel, stress corrosion, impurity content
