工程科学学报Issue(3)：329-335,7.DOI:10.13374/j.issn2095-9389.2015.03.011
喷射成形含铌 M3型高速钢的组织和耐磨性
Microstructure and wear resistance of spray-formed M3 high speed steel with niobium addition
摘要
Abstract
M3 high speed steel (HSS) with or without niobium addition was prepared by spray forming, and the effect of niobium on the microstructure of M3 HSS was investigated by scanning electron microscopy ( SEM) combined with energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysis, differential scanning calorimetry (DSC) and optical microscopy (OM). Fi-ner and uniformly-distributed grains without macrosegregation appear in the as-deposited HSS, and the addition of niobium tends to shift the precipitation of primary MC-type carbides to a higher temperature. Plenty of refined niobium-containing MC carbides precipi-tate as isolated sphere particles in the grain boundaries before onset of eutectic reaction. Niobium mainly appears in primary MC-type carbides by consuming carbon, which suppresses the degree of eutectic reaction to a large extent, leading to the decrease in both amount and size of M2 C lamella carbides. The refined metastable M2 C carbides in Nb-containing HSS can be completely decomposed easily during hot deformation, and the homogeneity of carbides in Nb-containing HSS is improved. The wear-resistant property of Nb-containing HSS is superior to that of M3 HSS at a lower load or temperature. But this gap is reduced with temperature rise. The main reason is that the large number of refined primary MC carbides can improve the abrasive wear resistance of HSS, but have no effect on its oxidation resistance.关键词
高速钢/喷射成形/铌/显微组织/磨损抗性Key words
high speed steel/spray forming/niobium/microstructure/wear resistance分类
矿业与冶金引用本文复制引用
王和斌,侯陇刚,卢林,张金祥,崔华,黄进峰,张济山..喷射成形含铌 M3型高速钢的组织和耐磨性[J].工程科学学报,2015,(3):329-335,7.基金项目
国家重点基础研究发展计划资助项目(2011CB606303) （2011CB606303）
