0.8设计系数用X80管线钢在近中性pH溶液中的应力腐蚀开裂行为  

Stress Corrosion Cracking Behavior of X80 Pipeline Steel with Design Factor of 0.8 in Near-neutral pH Value Solutions

作　　者：杨东平[1] 胥聪敏[1] 罗金恒 王珂 李辉辉[1] 

机构地区：[1]西安石油大学材料科学与工程学院材料加工工程重点实验室,西安710065 [2]中国石油集团石油管工程技术研究院石油管力学和环境行为重点实验室,西安710065

出　　处：《材料工程》2015年第1期89-95,共7页Journal of Materials Engineering

基　　金：陕西省教育厅专项科研计划项目(2013JK0895);陕西省重点学科专项资金资助项目(ys37020203)

摘　　要：采用慢应变速率拉伸(SSRT)实验研究了X80管线钢及其焊缝在近中性的NS4溶液中的应力腐蚀行为与敏感性。结果表明:X80管线钢及其焊缝主要是塑性损失,且焊缝塑性损失大于母材;X80管线钢及其焊缝在空气中属于典型的韧性断裂特征,在NS4溶液中属于穿晶应力腐蚀开裂(TGSCC),在NS4溶液中母材和焊缝断口中间区域比断口边缘区域表现出更明显的脆性断裂特征。电位在大于-749.86mV时,SCC机制为阳极溶解机制,在-749.86^-839.19mV之间时为阳极溶解和氢脆混合机制,小于-839.19mV时为氢脆机制。Stress corrosion cracking （SCC） behavior and sensitivity of X80 pipeline steel and weld joint in NS4 solutions were investigated using slow strain rate tension （SSRT） test. The results show that XS0 pipeline steel and weld joint appear mainly plastic damage. The plastic damage of weld joint is higher than that of base metal. The fracture mode of XS0 pipeline steel and weld joint exhibits typical ductile fracture in the air, and the transgranular SCC in NS4 solution. Both base metal and weld joint fracture＇s middle areas of XS0 pipeline steel exhibit more obvious brittle fracture feature than that of the edge area in NS4 solutions. The corrosion mechanism of XS0 steel is anodic dissolution（AD） above --749.86mV, and the mixed mechanism of AD and hydrogen embrittlement（HE） between -749.86- -839.19mV, and HE mechanism below --839.19inV.

关 键 词：X80管线钢 应力腐蚀开裂 慢应变速率拉伸 

分 类 号：TG172[金属学及工艺—金属表面处理]