对半固态高碳工具钢T12坯料在不同温度、不同保温时间下局部重熔后的组织演变进行了研究。结果表明,半固态T12钢坯料具有非枝晶和近球形的显微结构。半固态坯料局部重熔时,随着温度的升高和保温时间的延长,晶粒尺寸和圆整度都有所提高;局部重熔温度越高,保温时间越长,形状因子值越大、越接近1。 The microstructure evolution of semi-solid high-carbon tool steel T12 after partial remelting at different temperatures and different holding time was studied. The results show that semi-solid T12 billets have non-dendritic and nearly spherical microstructures. When the partial remelting of semi-solid billet partially remelted, the grain size and roundness increased with the increase of temperature and holding time; the higher the local remelting temperature, the longer the holding time, the larger the value of shape factor, The closer to 1.