X100管线钢的连续冷却相变及强韧性研究  

Continuous cooling transformation and strength-toughness of X100 pipeline steel

作　　者：王斌[1] 周翠[1] 赵迪 申坤[1] 胡红梅[1] 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500 [2]本溪钢铁公司国际贸易公司销售处辽宁本溪117000

出　　处：《兵器材料科学与工程》2013年第5期77-80,共4页Ordnance Material Science and Engineering

基　　金：四川省教育厅成果转化重大培育项目“抗大变形管线钢用新型药芯焊丝的研制”(13CZ0026)

摘　　要：通过连续冷却转变方式在全自动相变仪上测定X100管线钢的静态CCT曲线,分析不同冷却速度下X100管线钢显微组织的变化情况。结果表明:X100管线钢是铁素体、贝氏体的复相组织,冷却速度对各相的形态、数量、分布和硬度均有影响;当冷却速度为10~20℃/s,显微组织为针状铁素体+粒状贝氏体,M/A岛弥散分布于其晶界上,且硬度随着冷却速率的增加而增大;X100管线钢的应力-应变曲线为Round house型,有较高的强度和韧性,-20℃时夏比冲击吸收功达291 J;韧脆转变温度在-80^-100℃。The static CCT curve was investigated by continuous cooling transformation method on automatic transformation instru- ment, and the microstructure changes of X100 pipeline steel under different cooling rates were analyzed. The results show that the microstructure of X 100 pipeline steel is composed of bainite and ferrite. The cooling rates have great effect on the form, pro- portion, distribution of phases and hardness. When the cooling rate is between 10 ℃/s and 20 ℃/s, the microstructure consists of acicular ferrite and granular bainite, the M/A constituents are dispersed on the grain boundaries. Furthermore, the hardness increases with the cooling rates increasing. The stress-strain curve is typical Round-house shape and the steel exhibits good com- bination of strength and toughness, the Charpy impact energy reaches 291 J at -20 ℃, and the ductile-brittle transition tempera- ture is between -80 ℃ and -100 ℃.

关 键 词：X100管线钢 连续冷却相变 微观组织 强韧性 

分 类 号：TG142[一般工业技术—材料科学与工程]