254SMO奥氏体不锈钢热模拟断口断裂机理分析
The microstructure and fracture mechanisms of thermal simulation test for 254SMO austenitic stainless steel
何青
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作者单位：太原理工大学
中文关键字： 奥氏体不锈钢；254SMO；热塑性；断裂机制；热轧工艺
英文关键字：austenitic stainless steel,；245SMO,；thermoplasticity, ；racture mechanisms ；hot rolling process
中文摘要： 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及微观组织分析。研究结果表明：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为1200℃临近区域。
英文摘要：Gleeble-1500 thermal simulation testing machine is used to study the microstructure of fracture of 254SMO austenitic stainless steel. The fracture surface and microstructure of 254SMo austenitic stainless steel were analyzed at thermal simulation temperature by SEM,ESA and XRD. Research results show that: 254SMO austenitic stainless steel thermoplastic quality mainly caused by the σ phase. Thermal simulation results of fracture micromechanism temperature period is different, 254SMO austenitic stainless steel optimum thermoplastic temperature is during 1200℃.