湿H<sub>2</sub>S环境中L360MCS钢焊接热影响区的应力导向氢致开裂行为

doi:10.3724/SP.J.1037.2009.00669

金属学报

2010, Vol. 46

Issue (5): 547-553 DOI: 10.3724/SP.J.1037.2009.00669

论文

本期目录 | 过刊浏览

湿H₂S环境中L360MCS钢焊接热影响区的应力导向氢致开裂行为

周成双; 郑树启; 陈长风

中国石油大学(北京) 机电工程学院; 北京 102249

STRESS ORIENTED HYDROGEN INDUCED CRACKING BEHAVIOR OF HEAT AFFECTED ZONE OF L360MCS STEEL IN WET H₂S ENVIRONMENT

ZHOU Chengshuang; ZHENG Shuqi; CHEN Changfeng

Mechanical and Electrical Engineering Faculty; China University of Petroleum; Beijing 102249

引用本文:

周成双郑树启陈长风. 湿H₂S环境中L360MCS钢焊接热影响区的应力导向氢致开裂行为[J]. 金属学报, 2010, 46(5): 547-553.
. STRESS ORIENTED HYDROGEN INDUCED CRACKING BEHAVIOR OF HEAT AFFECTED ZONE OF L360MCS STEEL IN WET H₂S ENVIRONMENT[J]. Acta Metall Sin, 2010, 46(5): 547-553.

全文: PDF(968 KB)

摘要:

利用裂纹面分离及SEM和EDS研究了L360MCS钢焊接热影响区(HAZ)在湿H₂S环境中的应力导向氢致开裂(SOHIC)行为. 结果表明: 应力导向氢致开裂裂纹由轴向和纵向两种裂纹组成, 先形成轴向裂纹, 后形成纵向裂纹, 两种裂纹均独立形核. 裂纹带有明显的阶梯状氢致开裂特征, 裂纹面呈现准解理型断口形貌. 拉应力在裂纹形核和扩展方面起主要作用, 拉应力不仅增加了拉伸区的过饱和氢浓度, 而且直接推动纵向裂纹的扩展. 轴向裂纹在MnS和CaS夹杂以及析出相处形核, 以氢压为主要的裂纹扩展动力. 而纵向裂纹则主要在析出相处萌生, 裂纹扩展受拉应力和氢压双重控制, 拉应力为主导.

关键词 ：管线钢, 热影响区(HAZ), 应力导向氢致开裂(SOHIC), H₂S, 拉应力

Abstract：

Stress oriented hydrogen induced cracking (SOHIC) behavior of heat affected zone (HAZ) of L360MCS steel in wet H$_{2}$S
environment was studied by separating crack, SEM and EDS. The cracks are formed by four--point bending test in
wet H$_{2}$S environment. The microstructure of HAZ is obviously different from
the base metal, and the hardness of HAZ is lower than those of the base metal and welding joint. The fracture
surface of the cracks was separated and the hydrogen blisters were torn off. The cross section and fracture surface of
the cracks are analyzed by SEM and EDS. Results show that the cracks of SOHIC appeared as axial crack and vertical
crack, and the former is preferential. The appearance of cracks is associated with the low hardness value of
HAZ. The dimension of hydrogen blasters in tension stress zone of bended specimen is bigger than that in
unstressed specimen, which is due to hydrogen concentration in bended specimen is higher. Both axial and vertical
cracks nucleate independently and propagate in the quasi--cleavage manner. Tension stress not only increases the
supersaturated hydrogen concentration in tension stress zone but directly promotes vertical crack propagation.
Axial crack nucleates at MnS, CaS and precipitated phase, and propagates under internal hydrogen pressure.
Vertical crack mainly nucleates on precipitated phase and propagates under both internal hydrogen pressure and
tensile stress.

Key words： pipeline steel heat affected zone (HAZ) stress oriented hydrogen induce cracking (SOHIC) H₂S tension stress

收稿日期: 2009-10-10

基金资助:

国家自然科学基金项目50871122和高等学校博士学科点专项科研基金项目20070425021资助

作者简介: 周成双, 男, 1982年生, 博士生

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