MS X70酸性环境用管线钢焊接接头氢致开裂敏感性及氢捕获效率研究

doi:10.11900/0412.1961.2017.00101

金属学报

2017, Vol. 53

Issue (12): 1579-1587 DOI: 10.11900/0412.1961.2017.00101

本期目录 | 过刊浏览

MS X70酸性环境用管线钢焊接接头氢致开裂敏感性及氢捕获效率研究

赵小宇, 黄峰(

), 甘丽君, 胡骞, 刘静

武汉科技大学省部共建耐火材料与冶金国家重点实验室武汉 430000

Hydrogen-Induced Cracking Susceptibility and Hydrogen Trapping Efficiency of the Welded MS X70 Pipeline Steel in H₂S Environment

Xiaoyu ZHAO, Feng HUANG(

), Lijun GAN, Qian HU, Jing LIU

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430000, China

引用本文:

赵小宇, 黄峰, 甘丽君, 胡骞, 刘静. MS X70酸性环境用管线钢焊接接头氢致开裂敏感性及氢捕获效率研究[J]. 金属学报, 2017, 53(12): 1579-1587.
Xiaoyu ZHAO, Feng HUANG, Lijun GAN, Qian HU, Jing LIU. Hydrogen-Induced Cracking Susceptibility and Hydrogen Trapping Efficiency of the Welded MS X70 Pipeline Steel in H₂S Environment[J]. Acta Metall Sin, 2017, 53(12): 1579-1587.

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摘要:

对MS X70管线钢母材及其焊接接头氢致开裂(HIC)敏感性进行了评估,利用OM、FE-SEM和EBSD对其显微组织、HIC裂纹及周围的晶界结构进行了观察和分析,并通过计算渗透通量J_∞和氢有效扩散系数D_eff对母材及焊接接头的氢捕获效率进行了研究。结果表明,MS X70管线钢母材及其焊接接头的HIC敏感性均不能达到欧标要求,且焊接接头比母材具有更高的HIC敏感性。焊接接头的HIC敏感性较高主要归结于：以条状贝氏体为主的焊缝组织对H原子的捕获效率高于母材;焊接接头中较多的作为H通道的小角度晶界可通过提高大角度晶界氢捕获效率从而增加其裂纹敏感率;焊接接头中较少量低能重位点阵(CSL)晶界和Σ13b、Σ29b重位晶界降低了大角度晶界裂纹扩展抗力从而使其具有更高的HIC敏感性。

关键词 ： MS X70管线钢, 焊接接头, 晶界, 氢致开裂(HIC), 氢捕获效率

Abstract：

Pipeline steels for sour oil and gas containing H₂S generally suffer from either hydrogen-induced cracking (HIC) or sulfide stress corrosion cracking (SSC). Oil and gas containing high concentration H₂S are noxious to pipeline steels because of the hydrogen-induced corrosion. In this study, HIC susceptibility of welded MS X70 pipeline steels was evaluated in NACE “A” solution at room temperature. Meanwhile, microstructure and regions near a HIC crack in the MS X70 base steel and its welded joint were analyzed through OM, SEM and EBSD. The hydrogen trapping efficiency was also investigated by measuring the permeability (J_∞) and the effective hydrogen diffusivity (D_eff). The results showed that both base metal and welded joint were highly susceptible to HIC and the later steel sample was more vulnerable than the former. This higher susceptibility could be primarily attributed to the following effects: the higher hydrogen trapping efficiency of bainitic lath microstructure in the welded joint; the more low angle grain boundary in the welded joint also made it easier to crack by improving the hydrogen trapping efficiency of high angle grain boundary; the less amount of coincidence site lattice grain boundary and Σ13b、Σ29b lead to higher HIC susceptibility by decreasing the resistance to crack of high angle grain boundary.

Key words： MS X70 pipeline steel welded joint grain boundary hydrogen-induced cracking (HIC) hydrogen trapping efficiency

收稿日期: 2017-03-28

ZTFLH:

TG172.3

基金资助:国家自然科学基金项目No.51571154和湖北省科技支撑计划项目No.2015BAA083

作者简介:

作者简介赵小宇,男,1992年生,硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00101 或 https://www.ams.org.cn/CN/Y2017/V53/I12/1579

表1 MS X70管线钢和药芯焊丝的主要化学成分

图1 MS X70管线钢焊接接头宏观照片

图2 MS X70管线钢焊接接头显微组织的OM像

图3 MS X70管线钢焊接接头显微硬度分布图

表2 MS X70管线钢母材和焊接接头氢致开裂(HIC)敏感性参数

图4 MS X70管线钢母材和焊接接头放氢电流强度曲线

图5 MS X70管线钢母材和焊接接头氢渗透曲线

表3 MS X70管线钢母材和焊接接头氢渗透动力学参数

图6 MS X70管线钢母材和焊接接头HIC裂纹取向成像图

图7 MS X70管线钢母材和焊接接头HIC裂纹周围晶界分布图

图8 MS X70管线钢母材及其焊接接头不同晶界所占体积分数

图9 MS X70管线钢母材和焊接接头HIC裂纹附近重位点阵晶界频度图

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