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运用Gleeble-1500热模拟试验机对254SMO奥氏体不锈钢进行了高温拉伸试验,利用光学显微镜、扫描电镜等对热模拟拉伸断口进行了表面形貌观察。结果表明:254SMO奥氏体不锈钢热塑性的优劣主要由脆性的σ析出相决定;热模拟时各温度段的断裂微观机制均不同,254SMO奥氏体不锈钢最适宜的热塑性温度宜选在1200℃临近区域。
The hot tensile test of 254SMO austenitic stainless steel was carried out by Gleeble-1500 thermal simulator. The surface morphology of the hot-tensile fracture was observed by optical microscope and scanning electron microscope. The results show that the thermal and mechanical properties of 254SMO austenitic stainless steel are mainly determined by the brittle σ precipitates. The microscopic mechanism of fracture in each temperature section is different during thermal simulation. The most suitable thermoplastic temperature of 254SMO austenitic stainless steel should be near 1200 ℃ area.