【摘要】：通過(guò)掃描電鏡觀察X70管線(xiàn)鋼表面鐵素體微觀形貌,采用能譜儀分析其化學(xué)元素質(zhì)量分?jǐn)?shù)。在常溫及60℃時(shí),采用慢應(yīng)變速率法(SSRT),分別在空氣和氧質(zhì)量分?jǐn)?shù)為1.0×10-4的NACE(Na C1與CH3COOH質(zhì)量分?jǐn)?shù)分別為5%和0.5%)溶液中進(jìn)行X70管線(xiàn)鋼應(yīng)力腐蝕試驗(yàn),對(duì)試樣斷口形貌進(jìn)行分析,并研究溫度對(duì)X70管線(xiàn)鋼在氧質(zhì)量分?jǐn)?shù)為1.0×10-4溶液中應(yīng)力腐蝕開(kāi)裂(SSCC)敏感性的影響。研究結(jié)果表明:常溫下X70管線(xiàn)鋼應(yīng)力腐蝕敏感性不明顯,當(dāng)溫度升至60℃時(shí)應(yīng)力腐蝕敏感性增加,有應(yīng)力腐蝕傾向;氧元素對(duì)試樣應(yīng)力腐蝕性能有一定的促進(jìn)作用,60℃時(shí)NACE溶液中Cl-與O2運(yùn)動(dòng)加劇,是應(yīng)力腐蝕敏感性增強(qiáng)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，

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