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Stress Corrosion Cracking Study of Austenitic Stainless Steels by the Drop Evaporation Test

机译:降液蒸发试验应力腐蚀开裂研究奥氏体不锈钢

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The drop evaporation test (DET) is useful for study of stainless steels and related alloys resistance to stress corrosion cracking (SCC) in the chloride containing water environments at elevated temperature. This standardised test simulates the initiation of cracking under severe evaporating conditions with possibility of local chloride content increasing and precipitation (deposition) of salts and the test can be also modified. In the contribution the austenitic stainless steels (X9CrNi 19-9, XlCrNiCr 18-14-4, X2CrNiMoN 20-18-6, annealed) were compared and evaluated by the DET. The small specimens were resistively heated (≈250°C) in the exposed section under dropping of diluted NaCl water solution. The initiation and short cracks growth as well as pits were observed during test. The sequence of material resistance to SCC was determined according to relations time to fracture - tensile stress and conventional threshold stresses. The subcritical transcrystalline corrosion cracks and ductile shearing transcrystalline mechanism of unstable final fracture were confirmed by a light and scanning electron microscopy.
机译:下降蒸发试验(DET)可用于研究不锈钢和相关合金对升高温度含水环境中的氯化物中的应力腐蚀裂化(SCC)的抵抗力。该标准化测试模拟了在严重蒸发条件下裂化的启动,盐的局部氯化物含量增加和沉淀(沉积)也可以改变。在贡献中,比较奥氏体不锈钢(X6CrnI 19-9,XLcRNICR 18-14-4,X2Crnimon 20-18-6,退火)并由DET评估。在稀释的NaCl水溶液的滴加下,在暴露的部分中,小标本在暴露的部分中被电阻抗热(≈250℃)。在测试期间观察到开始和短裂缝的增长以及凹坑。根据关系时间来确定对SCC的材料抗性的序列 - 拉伸应力和常规阈值应力。通过光和扫描电子显微镜确认不稳定的最终骨折的亚临界经克隆腐蚀裂缝和延展性剪切经晶机理。

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