温度对X70管线钢在含氧溶液中应力腐蚀的影响
发布时间：2018-10-05 17:26
【摘要】：通过扫描电镜观察X70管线钢表面铁素体微观形貌,采用能谱仪分析其化学元素质量分数。在常温及60℃时,采用慢应变速率法(SSRT),分别在空气和氧质量分数为1.0×10-4的NACE(Na C1与CH3COOH质量分数分别为5%和0.5%)溶液中进行X70管线钢应力腐蚀试验,对试样断口形貌进行分析,并研究温度对X70管线钢在氧质量分数为1.0×10-4溶液中应力腐蚀开裂(SSCC)敏感性的影响。研究结果表明:常温下X70管线钢应力腐蚀敏感性不明显,当温度升至60℃时应力腐蚀敏感性增加,有应力腐蚀倾向;氧元素对试样应力腐蚀性能有一定的促进作用,60℃时NACE溶液中Cl-与O2运动加剧,是应力腐蚀敏感性增强的重要因素。
[Abstract]:The microstructure of ferrite on the surface of X70 pipeline steel was observed by scanning electron microscope (SEM). The chemical element mass fraction of X70 pipeline steel was analyzed by energy spectrometer. At room temperature and 60 鈩，
本文编号：2254234
[Abstract]:The microstructure of ferrite on the surface of X70 pipeline steel was observed by scanning electron microscope (SEM). The chemical element mass fraction of X70 pipeline steel was analyzed by energy spectrometer. At room temperature and 60 鈩，
本文编号：2254234
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