晏利君,祝鹏,刘宇,时佳,李玉卓,常增顺,孙佳玥

• 1:中油管道机械制造有限责任公司
• 2:中国石油天然气管道科学研究院有限公司
• 3:中国石油集团石油职业卫生技术服务中心

摘要(Abstract)：

通过夏比V型缺口冲击试验研究X70大变形管线钢20℃至-100℃的低温韧性,采用扫描电镜观察断口形貌并分析其断裂特征,讨论冲击温度、断口分离、分层裂缝等对管材低温韧性的影响,以及断口分离的影响因素。结果表明:随着冲击温度降低,纵向管材的冲击吸收能量没有明显减小,横向管材的冲击吸收能量以9%降速逐渐减小,-100℃时管材并没有发生脆性转变;随着温度降低而形成管材断口分离并趋于严重;断口起裂区和纤维区的微观形貌较为相似,以韧窝断裂为主,而放射区的微观形貌差异较大,温度低于-40℃时,放射区呈韧窝、滑移分离、解理断裂交互出现的混合型断裂特征;断口分离的主要影响因素是冲击温度和试样缺口方向,-40℃为管材冲击吸收能量转变和断口分离现象产生的临界温度点。

关键词(KeyWords)： X70大变形管线钢;低温;冲击韧性;断口分离;分层裂缝

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气集团公司科学研究与技术开发项目(2011B-3303)

作者(Author): 晏利君,祝鹏,刘宇,时佳,李玉卓,常增顺,孙佳玥

DOI: 10.13289/j.issn.1009-6264.2017-0488

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