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00Cr17Mn6Ni5N奥氏体不锈钢在10 kg真空感应炉内熔炼,并在氮气气氛下加氮化铬进行N合金化。通过Gleeble-1500D热模拟试验机进行高温拉伸试验。采用扫描电镜和蔡司金相显微镜,观察断口形貌及近断口处组织。研究表明,实验钢的高温塑性较好,最佳塑性区间为1050~1150℃,在1200℃附近存在高温脆性区;从1000~1250℃热模拟拉伸断口形貌分析,实验钢的断裂方式以韧性断裂为主,在1200℃脆性区的断裂为微孔或析出物为中心的韧窝断裂。
00Cr17Mn6Ni5N Austenitic stainless steel is smelted in a 10 kg vacuum induction furnace and N chromium alloyed with chromium nitride under a nitrogen atmosphere. High-temperature tensile tests were performed on a Gleeble-1500D thermal simulation tester. Scanning electron microscopy and Zeiss metallographic microscope were used to observe the morphology of the fracture surface and the tissue near the fracture surface. The experimental results show that the high temperature plasticity of the experimental steel is better, the best plasticity range is 1050 ~ 1150 ℃, and the high temperature brittleness zone exists near 1200 ℃. From the thermal simulation of 1000 ~ 1250 ℃, the fracture morphology of the experimental steel The ductile fracture is dominant, and the fracture in the brittle zone at 1200 ℃ is the dimple fracture centered on micropores or precipitates.