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金属学报  2018, Vol. 54 Issue (10): 1343-1349    DOI: 10.11900/0412.1961.2017.00522
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新型含Cu管线钢的抗氢致开裂性能
史显波, 严伟, 王威, 单以银, 杨柯()
中国科学院金属研究所 沈阳 110016
Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels
Xianbo SHI, Wei YAN, Wei WANG, Yiyin SHAN, Ke YANG()
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
引用本文:

史显波, 严伟, 王威, 单以银, 杨柯. 新型含Cu管线钢的抗氢致开裂性能[J]. 金属学报, 2018, 54(10): 1343-1349.
Xianbo SHI, Wei YAN, Wei WANG, Yiyin SHAN, Ke YANG. Hydrogen-Induced Cracking Resistance of Novel Cu-Bearing Pipeline Steels[J]. Acta Metall Sin, 2018, 54(10): 1343-1349.

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摘要: 

对比研究了传统X80管线钢和新型含Cu管线钢的氢致开裂敏感性。结果表明,传统X80管线钢抗氢致开裂性能不佳,氢致裂纹主要沿着马氏体/奥氏体(M/A)岛与基体界面扩展;而不同Cu含量的新型管线钢具有优异的抗氢致开裂性能,表现为氢致开裂实验后无裂纹出现。分析认为,含Cu管线钢中的纳米尺寸富Cu相提供了捕获H的有利陷阱,这种均匀弥散析出的细小富Cu相为H的分布提供了众多位置,有助于避免在局部区域产生很高的H富集而发生微观区域氢脆。纳米尺寸富Cu相作为有利氢陷阱为研发高强度兼具优异抗氢致开裂性能的新型管线钢提供了新思路。

关键词 管线钢Cu氢致开裂富Cu相氢陷阱    
Abstract

Hydrogen-induced cracking (HIC) resistance of pipeline steels is one of the most important properties for sour gas service pipelines. For the conventional pipeline steels, the strength level mainly depends on the Mn content. However, as the Mn content increases, the unfavorable microstructures such as large size martensite/austenite (M/A) islands, bainite or martensite will be generated, which will deteriorate the HIC resistance of the steels. Therefore, it is hard to simultaneously improve strength level and HIC resistance for pipeline steel. The nature of HIC in pipeline steel is hydrogen embrittlement, which is essentially the redistribution of H atoms into the matrix of steel. So, how to make the distribution of H atoms in the steel as evenly as possible without causing local enrichment is a key factor to improve the HIC of pipeline steels. In this work, the susceptibilities of HIC of traditional X80 and novel Cu-bearing pipeline steels were studied with comparison. The results showed that the X80 pipeline steel behaved bad HIC resistance. The hydrogen-induced cracks mainly expanded along the interface between M/A islands and the matrix. However, the novel Cu-bearing pipeline steels with different Cu contents exhibited excellent HIC resistance, showing no cracks were produced after HIC test. It was analyzed that nano-sized Cu-rich precipitates in the Cu-bearing pipeline steels are speculated to act as the beneficial hydrogen traps, and these uniformly dispersed fine Cu-rich phases in matrix provide many sites for the distribution of H atoms, which helps to avoid the localized high concentration H atoms enrichment leading to hydrogen embrittlement. Taking nano-sized Cu-rich phases as a type of beneficial hydrogen traps provides a new way for the development of new pipeline steels with high strength and excellent HIC resistance.

Key wordspipeline steel    Cu    hydrogen-induced cracking    Cu-rich phase    hydrogen trap
收稿日期: 2017-12-06     
ZTFLH:  TG142.1  
基金资助:沈阳市科技计划项目No.18-013-0-53
作者简介:

作者简介 史显波,男,1988年生,博士

Steel C Si Mn Mo Cu Ni Cr S P Nb+V+Ti Fe
1.0Cu 0.031 0.14 1.09 0.31 1.06 0.32 0.32 0.0011 0.005 0.05 Bal.
1.5Cu 0.019 0.12 1.03 0.31 1.46 0.31 0.31 0.0011 0.005 0.05 Bal.
2.0Cu 0.023 0.13 1.06 0.30 2.00 0.30 0.30 0.0010 0.005 0.05 Bal.
X80 0.046 0.10 1.68 0.19 0.30 0.20 0.29 0.0013 0.005 0.12 Bal.
表1  实验用钢的化学成分
图1  氢致开裂(HIC)试样取向及检测面示意图
图2  含Cu管线钢和X80管线钢在氢致开裂实验后的宏观腐蚀形貌及SEM像
图3  X80管线钢HIC裂纹形貌的OM像
图4  1.0Cu和X80钢中氢致裂纹扩展路径的SEM像
图5  X80钢和1.0Cu钢显微组织的SEM 和 OM像
图6  1.5Cu钢轧态和时效后的TEM像
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