王凤会,陈延清,王全礼,牟淑坤

• 1:首钢集团有限公司技术研究院

摘要(Abstract)：

采用中频真空感应炉冶炼了两种不同N含量的X70管线钢。利用Gleeble-2000热模拟研究了两种钢焊接热影响区的组织及冲击性能。采用三丝埋弧焊对两种钢分别进行了焊接,随后采用光学显微镜和冲击试验研究了两种钢的焊接接头组织及冲击韧性。结果表明:在N含量高的钢中发现了尺寸为20～50 nm、弥散分布的(Ti,Nb)(C,N)粒子,而N含量低的钢中只存在少量尺寸为50～100 nm的(Ti,Nb)(C,N)粒子。细小、弥散的(Ti,Nb)(C,N)粒子抑制了晶粒的长大,细化了晶粒,对稳定试验钢的热影响区冲击韧性有利。

关键词(KeyWords)： X70管线钢;焊接热影响区;析出相;冲击韧性

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王凤会,陈延清,王全礼,牟淑坤

DOI: 10.13289/j.issn.1009-6264.2019-0364

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