U71Mn钢轨端部淬火工艺研究  

Study on End Quenching Process for U71Mn Rail

作　　者：任安超[1] 周剑华[1] 朱敏[1] 费俊杰[1] 郑建国[1] 张银花[2] 董茂松[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080 [2]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《天津冶金》2015年第2期12-15,共4页Tianjin Metallurgy

基　　金：武汉市科技计划资助项目(2013011403010505)

摘　　要：采用CFD软件建立喷风冷却流场模型,模拟喷嘴与钢轨之间不同距离时流场的速度分布,利用Olympus PME3显微镜观察淬火低倍组织形貌,同时观察钢轨纵断面硬化区、过渡区以及软化区的组织,通过MVK-E型显微Vickers硬度计测量淬火区硬度。结果表明：模拟出喷嘴与钢轨之间的距离在15~20 mm范围时冷却效果最好。通过应用实践,淬火帽形、稳定硬化区、过渡区以及软化区硬度和组织,均满足了TB/T 2344标准要求,验证了模拟分析结果的正确性。CFD software was adopted to establish a model for the flow field of air cooling to simulate the distribution of the velocity of flow field between nozzle and rail at different distances. Olympus PME3 microscope was utilized to observe the macrostructure of quenching and the structures of the hardened zone, transition zone and softened zone of rail longitudinal section. MVK-E type micro Vickers durometer was used for measuring the hardness at quenching area. Simulation results showed that the best cooing effect was given when the distance between nozzle and rail was within the range of 15-20 mm. In practice, quenching cap profile and the hardness and structure of stable hardened zone, transition zone and softened zone all meet the requirement by TWF 2344 Standard and the correctness of simulation and analysis were proved.

关 键 词：钢轨 淬火 低倍组织 硬度 模拟 

分 类 号：TG156.3[金属学及工艺—热处理]