CAJ | 학술논문

将中国西部某管线现场取得的土壤样品配制成土壤溶液，对X65管线钢在该土壤溶液中进行氢渗透、慢拉伸和应力波动试验。通过观察试验数据和试件主断面及表面扫描电镜图，评价X65管线钢在该土壤溶液中发生SCC的敏感性及其他力学因素对SCC的影响。结果表明： X65管线钢在试验土壤溶液中对SCC是敏感的，氢原子的渗入使得敏感性提高，且提升的幅度较大， CO2气体能够促进氢在管线钢中的渗透；应力波动对应力腐蚀开裂初始阶段裂纹的萌生有重要的影响，二次应力波动试验表明，交变载荷的作用能够导致裂纹的进一步扩展。
장중국서부모관선현장취득적토양양품배제성토양용액，대X65관선강재해토양용액중진행경삼투、만랍신화응력파동시험。통과관찰시험수거화시건주단면급표면소묘전경도，평개X65관선강재해토양용액중발생SCC적민감성급기타역학인소대SCC적영향。결과표명： X65관선강재시험토양용액중대SCC시민감적，경원자적삼입사득민감성제고，차제승적폭도교대， CO2기체능구촉진경재관선강중적삼투；응력파동대응력부식개렬초시계단렬문적맹생유중요적영향，이차응력파동시험표명，교변재하적작용능구도치렬문적진일보확전。
Soil solution was taken from soil samples which were obtained from some western pipeline field in China. Hydrogen immersion test, slow tensile test and stress fluctuation test were conducted in soil solution for X65 pipeline steel. Test data were calculated and SEM of fracture surface and lateral surface of specimens were observed. The susceptibility of SCC of X65 pipeline steel in soil solution was assessed and effects of other mechanical factors on SCC were also studied. Test results showed that X65 pipeline steel is susceptible to SCC in soil solution and hydrogen immersion promotes the susceptibility greatly, and CO2 gas promotes the hydrogen immersion in pipeline steel. Stress fluctuation is with great influence on crack initiation during the preliminary stage of SCC. The secondary stress fluctuation indicated that the effect of alternating load can lead to further extension of crack.