半固态高碳(C＞1%)工具钢压缩变形的组织演变

采用Gleeble-1500热/力模拟机,对电磁搅拌法制备的高碳钢半固态坯料进行压缩实验,研究半固态高碳(C>1％)工具钢在不同温度、不同变形程度和不同变形速率下压缩变形的组织演变规律.结果表明,随变形程度的增加,试样心部和边部晶粒的尺寸逐渐减小;随温度的升高,固相率降低,试样心部和边部晶粒的尺寸变大;随变形速率的提高,试样心部的晶粒尺寸减小,边部的“大结构”破碎。

Microstructure evolution of high carbon (C＞1%) tool steel during compression

In order to research the microstructure evolution law and the deformation mechanism of semi-solid high carbon (C>1%) tool steel during compression process, the compression deformation experiments were carried out using Gleeble-1500 thermal simulator with specimens of semi-solid high carbon steel fabricated by magneto-hydrodynamic stirring process. The microstructure evolution law and the deformation mechanism of samples under different deformation temperature, reduction and rate were analyzed. Experimental results show that the average size of grains at center and edge of sample decreases with increasing the reduction degree; solid fraction decrease and the grain at center and edge grows with increasing the deformation temperature; the average size of grains at center decreases and the aggregation at the edge of sample breaks down with increasing the deformation rate.