非晶纳米晶Fe基孕育剂变质细化高速钢

Fe-Al-Cr-Nb-C-N amorphous nanocrystalline inoculant was prepared using the method of rapid solidification. and this inoculant was used to refine high speed steel. Based on the test and ananlysis results of the phase composition of Fe-Al-Cr-Nb-C-N inoculant,The effect of Fe-Al-Cr-Nb-C-N inoculant on structures and properties of W18Cr4V HSS was studied. The results show that the inoculant is a mixture of amorphous and nanometer crystal, andthe matrix phases of Fe-Al-Cr-Nb-C-N inoculant are Fe-Al(-Cr) intermetallics compound, and its reinforcement consists ofparticulate nitride, carbide, oxide and some important precipitated phase. With the addition of inoculant, the grain size of as-cast HSS was refined sharply, and the fishbone carbide tended to be broken. At the same time, the distribution of the carbides is more homogeneous in steel matrix. The quenching grain size of T1 is refined obviously after modification with Fe-Al-Cr-Nb-C-N inoculant. And the hardness, red-hardness , wear resistance and impact toughness are also improved obviously.