Preliminary Research on Ultra-clean High-speed-steel Powders
High-speed steel T15 and T15L(T15 modified with La and Ce rare-earth elements)powders were prepared with a self-innovative electrode induction melting gas atomization facility for making ultra-clean high-speed-steel powders.The particle size distribution,yield,purity,morphology,microstructure,oxygen and nitrogen contents of the two powders were studied by SEM,EDS,XRD,ON-3000 Oxygen Nitrogen Analyzer.The results show that the T15 and T15L powders prepared by electrode induction melting gas atomization(EIGA)are nearly spherical in shape,and smooth surface of particles,with a few powders in the form of rods or other irregular shapes.The size of T15L powder is more uniform and there is less satellite powder compared to T15 powder.The T15 powder below 76μm particle size accounted for 50%,The T15L powder below 74μm particle size accounted for 50%,La and Ce do not obviously change the particle size distribution of high-speed steel powder,but have a certain effect on the reduction of oxygen content.The loose density of T15L powder is lower than that of T15,and the tap density is higher.The T15 and T15L as-cast condition have a dendritic morphology,the average dendrite spacing in T15 and T15L are 18.63 and 15.06μm respectively.The average volume fraction of carbides in T15 and T15L are 48.61%and 37.57%respectively.It shows that after adding rare earth elements,the grains of T15L as-cast condition is refined,the volume fraction of eutectic carbides is reduced,and the non-uniformity is improved.The T15 and T15L as-cast condition mainly contain M6C carbides,which are typical of fishbone,irregular layered carbides of M2C carbides and deeper colored blocky,short rodlike MC carbides.
EIGA high speed steel T15 and T15L powders La and Ce carbides
Tian Tian Hao Zhibo Zhao Bo Peng Shiqing Yan Mengjie Ge Changchun
Institute of Powder Metallurgy and Advanced Ceramics,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China
国际会议
北京
英文
202-209
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）