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Study of stress corrosion cracking initiation of high alloy materials

机译:高合金材料应力腐蚀开裂的研究

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The stainless steels and related alloys with sufficient resistance to a general corrosion can besusceptible to a localized corrosion (pitting, cracking, intergranular corrosion) in certainenvironment under specific conditions. The Drop Evaporation Test (DET) was developed forstudy of stainless materials resistance to stress corrosion cracking (SCC) at elevatedtemperatures 100 – 300 ℃ under constant external load using a chloride containing watersolution. In the contribution the initiation and propagation of short cracks as well as pits wereobserved during the test. The crack initiation and/or propagation can be influenced by thecyclic thermal stresses, when the diluted water solution drops cool down the hot sample. Thecoordinates measurement of microscopic pits and sharp corrosion crack tips by the travellingmicroscope method allowed to derive the crack growth lengths and rates of short cracks.
机译:在一定条件下,在特定条件下,对一般腐蚀具有足够抵抗力的不锈钢及其相关合金可能会受到局部腐蚀(点蚀,裂纹,晶间腐蚀)的影响。滴落蒸发试验(DET)的开发是为了研究不锈钢材料在恒定的外部载荷下,使用含氯化物的水溶液在100 – 300℃的高温下抗应力腐蚀开裂(SCC)的能力。在测试过程中,观察到了短裂纹以及凹坑的产生和扩展。当稀释的水溶液液滴冷却热样品时,裂纹的萌生和/或扩展可能会受到循环热应力的影响。通过行进显微镜方法对微观凹坑和尖锐腐蚀裂纹尖端进行坐标测量,可以得出裂纹扩展长度和短裂纹率。

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