王雷,刘云,周勇,毕宗岳,冯雪楠,谭昊

• 1:西安石油大学材料科学与工程学院
• 2:国家石油天然气管材工程技术研究中心

摘要(Abstract)：

通过电子背散射衍射(EBSD)技术和透射电镜(TEM)等研究了低碳微合金钢经3种成熟的焊接工艺(打底焊、间隙焊和连续焊)焊接后的焊接接头热影响区软化区的本质及软化机理。结果表明:低碳微合金钢卷板经制管过程后亚晶界比例及位错密度显著提升,呈现典型的加工硬化效应,并伴随一定程度的细晶强化、固溶强化和第二相粒子强化。经3种焊接工艺后,再结晶晶粒比例增加,高应变区域减少,软化区的小角度晶界明显减小,位错密度下降。低碳微合金钢油管焊接软化区的形成机制主要是部分组织在焊接热循环的作用下,受形变的强化组织发生回复与部分再结晶,从强化机制角度看,具体表现为应变强化和细晶强化效应降低。

关键词(KeyWords)： 低碳微合金钢油管;热影响区;软化区;软化机制

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2016ZX05023006-001-002);; 陕西省教育厅科研计划(18JK0604);; 中石油集团公司项目(2015F-2001);; 西安石油大学“材料科学与工程”省级优势学科资助

作者(Author): 王雷,刘云,周勇,毕宗岳,冯雪楠,谭昊

DOI: 10.13289/j.issn.1009-6264.2018-0525

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