本文研究了快速凝固水雾化M3/2高速钢粉末的凝固特征。经理论计算，水雾化M3/2高速钢粉末的平均冷却速度在10^5～10^7K/s之间。粉末颗粒的凝固组织主要以等轴晶为主，碳化物以空间网络状分布于等轴晶之间的晶界处。粉末基体组织以奥氏体为主，仅小粒径粉末基体由奥氏体与δ铁素体共同组成。碳化物主要为立方的MC型和密排六方的M2C型。
The solidification characteristics of rapidly solidified M3/2 high speed steel powers produced by water atomization were investigated. The cooling rate of the powers was calculated to be 10^5～10^7K/s. In the size range of the atomized powders, the microstructure was found to exhibit an equiaxed crystal morphology, with carbides existing in continuous network between the crystal grains. The matrix of the HSS powders was principally austenite; as the particle size decreased, the matrix changed from austenite to austenite/ ferrite. The types of carbides were mainly cubic MC and close-packed hexagonal, M2C.
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