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依据NACE TM 0284-2003标准比较了X80和X120管线钢的氢致开裂(HIC)敏感性,采用光学显微镜、扫描电镜观察了裂纹扩展形貌,分析了裂纹扩展与管线钢微观结构之间的关系,依据氢渗透试验结果讨论了管线钢微观组织对氢原子捕捉能力的影响.结果表明,具有针状铁素体组织的X80钢的抗HIC敏感性高于含超低碳贝氏体组织的X120钢;X80钢中HIC裂纹主要沿着多边形铁素体(PF)扩展,X120钢中的HIC裂纹主要沿着原奥氏体晶界扩展;以板条贝氏体为主的X120管线钢对氢原子的捕获能力大于以针状铁素体为主的X80管线钢.

参考文献

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