X80管线钢氢致开裂研究  

Research on Hydrogen Induced Crack of X80 Pipeline Steel

作　　者：王萍[1] 陈富强[1] 石云峰[2] 吴扣根[2] 黄贞益[1] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]宝山钢铁股份有限公司,上海200941

出　　处：《热加工工艺》2013年第16期208-211,共4页Hot Working Technology

基　　金：国家科技支撑计划项目(2007DAE300B01);轧制技术及连轧自动化国家重点实验室开放课题项目(2009002)

摘　　要：通过电化学充氢法研究了X80管线钢氢致裂纹(HIC)的种类及开裂特征,探讨了氢致开裂规律,对X80管线钢的氢致开裂影响因素进行了分析。结果表明:随充氢时间的延长和电流密度的增大,氢鼓泡的密度逐渐增大,体积先增大后趋于稳定;形成的氢致裂纹主要呈阶梯状,由直线型裂纹和"S型裂纹"组成,多以穿晶方式扩展,裂纹尖端沿着晶界萌生;X80管线钢中的带状组织是氢致裂纹萌生和扩展的聚集场所;非金属夹杂物是氢致裂纹萌生的裂纹源,其中较大尺寸的Al和Si的氧化物易于诱发"S型裂纹"形成,对管线钢抗氢致开裂的敏感性有很大影响。The species and cracking characteristics of X80 pipeline steel hydrogen induced cracking （HIC） was studied by electrochemical charge-to hydrogen. The law of hydrogen-induced cracking of X80 pipeline steel hydrogen induced cracking influencing factors specific analysis was explored. The results show that： with the hydrogen filling time and the current density increasing, the density of hydrogen blistering gradually increases, volume first increases and then stabilized. The ladder-like hydrogen-induced cracking is composed of linear cracks and ＂S-crack＂, which is mostly transgranular extension, and the initiation of the crack tip is along the grain boundaries. The banded structure in X80 pipeline steel is where the hydrogen-induced crack initiate and gather; non-metallic inclusion is the source of hydrogen induced crack initiation crack, where the larger size orAl and Si oxide is easy to induce ＂S-crack＂ formation, and the sensitivity of resistance to hydrogen is influenced.

关 键 词：X80管线钢 电化学充氢 氢致开裂 

分 类 号：TG113.253[金属学及工艺—物理冶金]