Resistances to SCC and HIC for 17-4PH Steel in H2S Environment
摘 要
根据美国NACE标准研究了17-4PH钢在酸性H2S水溶液中的抗氢致开裂(HIC)和应力腐蚀开裂(SCC)的性能,利用光学显微镜及扫描电镜(SEM)观察了裂纹及组织形貌,并结合理论分析了材料的氢致开裂与应力腐蚀开裂行为。结果表明:17-4PH钢在标准NACE试验溶液中会产生氢致裂纹,试样内部微裂纹主要在晶界、夹杂等缺陷处成核并扩展;标准C型环试样在0.8σs的恒应力作用下,浸泡于饱和硫化氢溶液中,720 h内3组试样均发生断裂,表明其SCC敏感性较大,试样的宏观裂纹由边缘向内部扩展;扫描电镜结果显示,SCC断口有明显的脆性断裂(解理断口)特征,应力腐蚀开裂是由HIC引起,且裂纹扩展形式多为穿晶型。
Abstract
According to the American NACE standard the resistances of 17-4PH steel to hydrogen induced cracking (HIC) and stress corrosion cracking (SCC) in wet H2S environment were studied, and the microstructure and cracks were observed using optical microscopy and scanning electronic microscopy (SEM). The HIC and SCC behaviors were analyzed in combination with theoretical analysis. The results show that the hydrogen induced cracks appeared in the 17-4PH steel in standard NACE test solution, the internal micro-cracks formed and grew in boundaries, inclusions and other defects mainly. Within 720 hours, three standard C-ring specimens were broken under the constant load stress of 0.8σs in a saturated solution of hydrogen sulfide, indicating the high susceptibility to SCC of the specimens, and macroscopic cracks extended from sample edge to the inside. SEM examination show that SCC fracture was distinguished by brittle fracture. Stress corrosion cracking was caused by HIC, most cracks extended as transgranular form.
中图分类号 TG172.9 DOI 10.11973/fsyfh-201602002
所属栏目 试验研究
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收稿日期 2015/2/2
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备注魏安安(1957-),教授级高工,学士,从事化工机械防腐蚀与延寿工作,
引用该论文: WANG Yao,WEI An-an,SHEN Deng-luan. Resistances to SCC and HIC for 17-4PH Steel in H2S Environment[J]. Corrosion & Protection, 2016, 37(2): 100
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参考文献
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【2】余荷英,赵子伟,万晓景,等. 17-4PH钢在3.5% NaCl水溶液中的应力腐蚀开裂[J]. 机械工程材料,1989,13(4):17-20.
【3】NACE TM0284-2003Evaluation of pipeline and pressure vessel steels for resistance to hydrogen induced cracking[S].
【4】GB/T 20972.2-2008石油天然气工业油气开采中用于含硫化氢环境的材料 第二部分: 抗开裂碳钢、低合金钢和铸铁[S].
【5】NACE TM0177-2005Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H2S environments[S].
【6】乔利杰,王燕彬,褚武杨. 应力腐蚀机理[M]. 北京:科学出版社,1993:6-50.
【7】褚武杨,乔丽杰,李金许,等. 氢脆与应力腐蚀[M]. 北京: 科学出版社,2013:364-365.
【8】TIEN J K,THOMPSON A W,BERNSTEIN I M,et al. Hydrogen transport by dislocation[J]. Metall Trans A,1976,7:821-825.
【9】刘智勇,李明,李晓刚. 16Mn(HIC)钢在硫化氢环境中的应力腐蚀开裂行为[J]. 中国腐蚀与防护学报,2006(6),361-373.
【10】ZIELINSKI A,DOMZALICKI P. Hydrogen degradation of high-strength low-alloyed steels[J]. J Mater Proc Thch,2003,133:230-236.
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