CAJ | 학술논문

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。
위연구 X120관선강경치개렬원인，근거 NACE 표준 TM 2048—2003측시료 X120시험관선강적 HIC 민감성，병채용Davanathan-Stachursky 경삼투장치분별측량료기불동알판후도처적경삼투곡선，채용소묘전경화 EBSD 기술관찰료불동알판후도처적미관조직급정립취향차분포。결과표명：X120관선강적 HIC 렬문다출현재알판적차표층；유우알판차표층적미관조직여정립취향차적공동작용，최종도치해처대경원자적포획효솔최고，HIC 민감성야최강。
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.