Microstructure and precipitates of X120 high strength pipeline steel
A new ultrahigh strength pipeline steel with yield strength 950 MPa has been demonstrated by means of scanning electron microscopy and transmission electron microscopy,and the charp impact toughness of this steel at -30℃ is 227J.Obsevation has shown that the microstructure of the steel comprises a majority of the low carbon lath bainite with different sublaths and sub-sublaths,meanwhile there is high density of dislocation between laths and a small amount of dispersed film-like martensite-anstenite (M-A)constituents.The precipitates in this steel are most of duplex type containing Nb and Ti with characterized morphology of cap.The precipitation sizes observed are a few tens to a few nanometers.
pipeline steel microstructure bainite precipitate
Liu Junliang Zhang Jiming Gao Jiaqiang Shen Wei Zheng Lei Zhang Chuanguo
Baosteel Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China
国际会议
上海
英文
1208-1211
2008-09-26（万方平台首次上网日期，不代表论文的发表时间）