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研究了汽车用AISI 347不锈钢在酸性氯化钠水溶液中的环境诱发破裂性能。结果显示,经过650℃保温后AISI 347不锈钢具有抵抗敏化的能力;其腐蚀电位钝态区范围随650℃保温时间的延长而缩小;在25℃、pH=2的3.5%(质量分数)NaCl水溶液或90℃、pH=2的1%NaCl水溶液中,主要以延性韧窝状的模式断裂,应力腐蚀破裂仅局限在试棒断面的边缘,其抵抗环境诱发破裂性能良好,具有优良的抗应力腐蚀破裂的性能。
The environmental-induced rupture behavior of automotive AISI 347 stainless steel in acidic aqueous sodium chloride solution was investigated. The results show that AISI 347 stainless steel has the ability of resisting sensitization after heat preservation at 650 ℃. The passivation potential of AISI 347 decreases with the increase of holding time at 650 ℃. At 25 ℃, 3.5% (mass fraction) NaCl Aqueous solution or 1% NaCl aqueous solution with pH = 2 at 90 ° C, the fracture is mainly in the ductile dimple mode. The stress corrosion cracking is limited to the edge of the cross section of the test rod and has good resistance to environment-induced rupture and excellent stress resistance Corrosion cracking performance.