X120管线钢轧板不同厚度处的氢致开裂敏感性研究  

Study on HIC sensitivity at different thickness of X120pipeline steel

作　　者：段小林[1] 刘静[1] 黄峰[1] 胡骞[1] 张杰[1] 彭先华[1] 鲁修宇[2] 

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [2]武汉钢铁(集团)公司研究院,武汉430082

出　　处：《中国科技论文》2015年第16期1973-1977,共5页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20124219110004)

摘　　要：为研究X120管线钢氢致开裂原因,根据NACE标准TM 2048—2003测试了X120试验管线钢的HIC敏感性,并采用Davanathan-Stachursky氢渗透装置分别测量了其不同轧板厚度处的氢渗透曲线,采用扫描电镜和EBSD技术观察了不同轧板厚度处的微观组织及晶粒取向差分布。结果表明:X120管线钢的HIC裂纹多出现在轧板的次表层;由于轧板次表层的微观组织与晶粒取向差的共同作用,最终导致该处对氢原子的捕获效率最高,HIC敏感性也最强。To study the hydrogen induced cracking （HIC）of X120 pipeline steel,the HIC susceptibility in H2 S environments of X120 steel of different rolled plate thickness was evaluated by using NACE TM 2048-2003 standard.The hydrogen trapping effi-ciency was investigated by measuring the permeability （J ∞）and the apparent diffusivity （Dapp ）.Field emission scanning electron microscopy （FE-SEM）and energy dispersive spectrometry （EDS）were employed to study the microstructure and the grain mis-orientation distribution,respectively.The results suggested that X120 steel has the highest HIC susceptibility at the subsurface of rolled plate;due to the interaction between the microstructure and the grain mis-orientation distribution,the subsurface of the rolled plate has the highest hydrogen trapping efficiency and the highest HIC susceptibility.

关 键 词：X120管线钢 微观组织 氢致开裂 氢渗透 晶粒取向差 

分 类 号：TG335.5[金属学及工艺—金属压力加工]