偏析及M/A组元对高强度管线钢抗氢致裂纹性能的影响  

Effect of segregation and M/A constituent on hydrogen induced cracking resistance of high strength pipeline steel

作　　者：陈健[1,2] 胡亮 汪兵[2] 刘清友[2] 刘翔[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院工程用钢所,北京100081 [3]番禺珠江钢管有限公司,广东番禺511450

出　　处：《金属热处理》2015年第9期21-28,共8页Heat Treatment of Metals

基　　金：国家科技支撑计划(2011BAE25B00;2011BAE25B03)

摘　　要：通过调整Mo、Ti的含量,得到了3种M/A组元含量不同的高强度管线钢,运用LIBS-OPA-100原位分析仪、扫描电镜(SEM)等手段,研究了偏析及M/A组元对高强度管线钢抗氢致裂纹(HIC)性能的影响。结果表明,3种高强度管线钢M/A含量分别为1号钢(高Mo低Ti)17.4%、2号钢(中Mo中Ti)2.1%、3号钢(无Mo高Ti)0.75%,Mo促进了M/A组元形成,Ti微合金化可有效抑制M/A组元形成,M/A组元的含量、尺寸、形状及分布是影响高强度管线钢抗HIC性能的重要因素,尤其是大块状的M/A使抗HIC性能急剧下降;C、Mn、Si元素在1/4处和中心发生偏析和硬度较高的M/A组元是导致1号、2号试验钢氢致开裂的主要原因;使用原位分析仪测得Al的偏析度顺序为2号钢>1号钢>3号钢,氧化铝夹杂物是诱发氢致裂纹一个重要原因。Three kinds of high strength pipeline steels with different contents of M / A constituent were gained through adjusting the content of Mo and Ti. Effect of segregation and M / A constituent on hydrogen induced cracking（ HIC） resistance of the high strength pipeline steels were analyzed by means of LIBS-OPA-100 in-situ analyzer and scanning electron microscopy（ SEM）. The results show that the content of M / A constituent are 17. 4%,2. 1% and 0. 75% respectively in No. 1 steel（ high Mo content,low Ti content）,No. 2 steel（ middle Mo content,middle Ti content） and No. 3 steel（ no Mo,high Ti content）. Mo can promote the forming of M / A constituent,while micro-alloyed Ti plays an opposite role. The content,size,shape and distribution of M / A constituent are important factors to affect the HIC resistance property of high strength pipeline steels. Especially,the large block M / A constituent reduces the HIC resistance property sharply. The segregation of C,Mn and Si element in the 1 /4 thickness position and the core of the steel and the high hardness of M / A constituent are the main reasons leading to the hydrogen induced cracking of No. 1 and No. 2 tested steel. The segregation degree of Al element measured by insitu analyzer in the order of large to small is No. 2 steel 〉No. 1 steel 〉No. 3 steel,and the aluminum oxide inclusion is one of the important causes of hydrogen induced cracking.

关 键 词：管线钢 M/A组元 偏析 氢致裂纹(HIC) 硫化氢(H2S) 氧化铝夹杂物 

分 类 号：TG142[一般工业技术—材料科学与工程]