作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《东北大学学报（自然科学版）》 2002年第11期1097-1100,共4页

摘　　要： 在实验室新建的水平式双辊铸轧机上进行了W9高速钢薄带的铸轧实验研究,得到了主要工艺参数对铸带显微组织分布的影响规律,给出了实验室条件下W9高速工具钢薄带铸轧工艺参数的最佳变化范围·研究了铸轧对高速钢薄带的组织及碳化物形态的影响,铸轧高速钢显微组织主要由马氏体、残余奥氏体及共晶碳化物组成,不存在鱼骨状莱氏体组织,薄带内的残余奥氏体的质量分数仅为10%左右·碳化物以片层状M2C型为主,呈断续网状分布在晶界上,而M6C型的鱼骨状碳化物很少·铸轧高速钢薄带的退火组织主要为索氏体组织和碳化物·碳化物球化的机理在于铸轧改善了共晶碳化物球化的动力学条件,使碳化物层片明显细化,有利于碳化物的球化,同时铸轧有利于亚稳定的M2C型碳化物的形成,使铸轧状态高速钢薄带的球化退火变得容易· ?The experimental study on castrolling of W9 highspeed steel strip was carried out by using the horizontal twinroll strip caster. The effects of the main processing parameters on the microstructure of the strips were investigated,and the optimal processing parameters were obtained. Microstructure and eutectic carbide morphology of the strip in the castrolled state and subsequent annealled were examined. The microstructure of the strip in the castrolled state is mainly consiste of martensite, residual austenite and eutectic carbide. Fish bone ledeburite does not exist in the strip and the amount of residual austenite is just 10 per cent. The microstructure of the strip in the subsequent annealled state is mostly composed of sorbite and eutectic carbide. Carbide spheroidizing mechanics denpends on the casting operation which improved dynamics condition of eutectic carbide spheroidizing. The twinroll strip casting results in carbide layer tablets finer and easier to be spheroidizied. And at the same time twin roll strip casting process is favorable to formation of M2C type carbide due to the rapid cooling of the process.

关 键 词： 双辊铸轧 高速钢 碳化物球化 显微组织 退火

领　　域： [冶金工程]