李学达,林学强,孙建波,曹宁

• 1:中国石油大学(华东)机电工程学院

摘要(Abstract)：

利用Gleeble热模拟实验机模拟了铁素体-贝氏体双相X100管线钢在不同的单道次热循环临界峰值温度(760℃和800℃)下生成的临界热影响区(ICHAZ)的组织,利用光学显微镜、扫描电镜、透射电镜等对显微组织进行了表征,尤其是对马氏体-奥氏体(M-A)组元的分布状态进行了研究。同时对不同峰值温度的样品在-20℃的冲击韧度进行了测试。结果表明,铁素体-贝氏体双相X100管线钢ICHAZ的冲击韧度较高,在760℃时平均为163 J,800℃时平均为201 J。800℃时的冲击韧度高于760℃,这是因为760℃时形成的M-A组元的分布较为连续,而加热至800℃时逆转组织含量更高,部分逆转组织转变为贝氏体,从而使得M-A组元的分布较为分散。贝氏体-铁素体双相组织X100管线钢的ICHAZ的冲击韧度明显高于传统的单相贝氏体组织管线钢,这是由于双相组织的ICHAZ处的M-A组元沿着铁素体-贝氏体边界形成,尺寸较小并且比较分散,因此对冲击韧度的危害程度显著降低。

关键词(KeyWords)： X100管线钢;临界热影响区;组织;冲击韧度;M-A组元

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金项目(2015M582159);; 山东省博士后创新项目(201602029);; 青岛市博士后应用研究项目资助(2015240)

作者(Author): 李学达,林学强,孙建波,曹宁

DOI: 10.13289/j.issn.1009-6264.2016-X303

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