| CO_3~(2-)-HCO_3~-溶液中X80管线钢焊接接头的应力腐蚀开裂分析 |
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| 引用本文： | 王炳英,霍立兴,张玉凤,王东坡. CO_3~(2-)-HCO_3~-溶液中X80管线钢焊接接头的应力腐蚀开裂分析[J]. 焊接学报, 2007, 0(7) |
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| 作者姓名： | 王炳英 霍立兴 张玉凤 王东坡 |
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| 作者单位： | 天津大学材料科学与工程学院 天津300072 |
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| 摘 要： | 采用慢应变速率试验(SSRT)、扫描电镜(SEM)观察研究了国产X80管线钢焊接接头在0.5mol/LNa2CO3 1mol/LNaHCO3溶液中的应力腐蚀开裂(SCC)敏感性。结果表明,拉伸试样全部断裂在焊缝或热影响区。在所研究的电位区间,拉伸试样随着外加电位正向增加,断面收缩率、断裂时间和断后伸长率增加,而断口部位的裂纹平均扩展速率减小,SCC敏感性降低。试样断口形貌在阴极电位条件下呈准解理断裂,在自腐蚀电位和阳极电位条件下,焊缝试样断口主要是韧性断裂。应力腐蚀机理可以用阳极溶解理论和氢致破裂来解释。
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| 关 键 词： | X80管线钢 焊接接头 慢应变速率试验 应力腐蚀开裂 |
CO_3~(2-)-HCO_3~- stress corrosion test of welded joint for X80 pipeline steel |
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| WANG Bingying,HUO Lixing,ZHANG Yufeng,WANG Dongpo. CO_3~(2-)-HCO_3~- stress corrosion test of welded joint for X80 pipeline steel[J]. Transactions of The China Welding Institution, 2007, 0(7) |
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| Authors: | WANG Bingying HUO Lixing ZHANG Yufeng WANG Dongpo |
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| Abstract: | The susceptibility to stress corrosion cracking (SCC) of the welded joint of X80 pipeline steel in solution of 0.5 mol/L Na2CO3 and 1mol/L NaHCO3 was investigated by means of slow strain rate testing (SSRT) and scanning electron microscope. The results showed that all tensile test specimens cracked in welded joint and heat affected zone (HAZ). The general tendency in the studied potential range was that with positive increasing of potential, reduction in area, fracture time and elongation of specimens increased, and mean crack growth rate of SCC and the susceptibility to SCC decreased. At cathodic potentials, obvious quasi-cleavage fracture was observed in the fracture area of specimens. At open circuit potential and anodic potential, ductile fracture was the common fracture pattern. The mechanism of the stress corrosion could be explained with anodic solution theory and hydrogen induced cracking. |
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| Keywords: | X80 pipeline steel welded joint slow strain rate testing stress corrosion crack |
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