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材料工程  2015 

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

DOI: 10.11868/j.issn.1001-4381.2015.01.016, PP. 89-95

Keywords: X80管线钢,应力腐蚀开裂,慢应变速率拉伸

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Abstract:

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.

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