although the resistance to oxidation increases with the increase of tungsten, the netlike carbides distributed along the crystal boundary including m2c, m6c and complex carbides manifold by means of the analysis of optical microstructure, xrd and reckoning the volume fraction of carbides by lattice 1变质时;晶粒大小在扣100pm之问,而网状碳化物明显细化,网状碳化物处在1030um之间;用14re1img复合变质后,晶粒大小在1050um之间,网状碳化物处在1020um之间,组织细小而均匀,绝大部分晶界碳化物呈断网状分布。
the results show that the solidification microstructure of high speed steel fe-2 % c-4 % v-4 % mo-5 % cr-x % w ( wt ) contains of martensite, retained austenite structure, and mc, m6c, m2c carbides, and mc / m2c complex carbides by xrd, sem and metallographs . most of the mc carbides locate in the cell and other carbides distribute along the boundary of the cell 结果表明:经金相组织观察、x射线衍射和扫描电镜分析,fe-2c-4v-4mo-5cr-xw合金系高速钢凝固组织包含马氏体基体、残余奥氏体及各种类型的碳化物如mc型碳化物、m_2c型碳化物、m_6c型碳化物和mcm_2c类型复杂碳化物,大部分mc型碳化物分布于晶粒内部,其它类型碳化物则沿晶界呈网状分布。