摘要
研究了水雾化M 2和M 4高速钢粉末在 7× 10 -2 Pa真空下加热后组织结构的变化。当粉末加热至固相线以下 15～ 2 0℃ ,即 12 2 0～ 12 2 5℃时 ,M6C及MC型碳化物都由 1～ 2 μm长大到 3～ 4 μm ;当粉末加热至固相线以上时 ,碳化物尤其是M6C型碳化物颗粒快速长大 ,并且有不均匀长大现象 ;当温度升至 12 5 0℃后 ,贫碳型的M4C3 转变为MC型碳化物 ,其中大部分Fe被V所取代 ;当进一步加热至 12 6 0℃以上时 ,M6C型碳化物将转变为M2 C碳化物。经真空脱氧后高速钢粉末的氧含量降低至 10 0× 10 -6以下。
The microstructural changes of M2 and M4 high speed steel powders were investigated during heating in the vacuum of 7 × 10-2Pa. Both M6 and MC carbides only grew from 1-2 μm to 3-4 μm if heating to 1220-1225°C, 15-20°C below the solidus of HSS. When it is heated above the solidus, the particle size of carbides especially for M6C rapidly and non-homogeneously is increased. When the temperature is elevated from 1220°C to 1250°C, M4C3 is transformed to MC, in which main part of Fe should be substituted by V. M6C will be turned into M2C at the temperature higher than 1260°C. The oxygen content is decreased to lower than 100 × 10-6 after deoxidization.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2003年第3期145-150,共6页
Powder Metallurgy Technology
