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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Al对M2高速钢凝固组织的影响*
DOI: 10.3724/SP.J.1037.2013.00621, PP. 769-776
Keywords: M2高速钢,Al,凝固组织,M2C共晶碳化物,微观结构
Abstract:
采用OM,TEM,SEM,EBSD,XRD等手段,分析了不同Al加入量(0%,0.6%,1.2%)的M2高速钢的铸态组织,研究了Al对高速钢凝固组织转变特别是共晶碳化物形貌和微观结构的影响规律.结果表明,M2高速钢铸态组织主要由位错型马氏体和M2C共晶莱氏体组成.过量Al(1.2%)促进大量铁素体和针状碳化物形成.Al提高了共晶碳化物的分布均匀性,促进M2C形貌由纤维状转变为片状,并使碳化物微观结构发生明显改变.片状碳化物表面平行于(0002)晶面,内部存在微孪晶、层错等缺陷,片层之间具有不同的晶体取向,而纤维状碳化物内部缺陷极少,呈单晶取向.与纤维状碳化物相比,加Al后形成的片状碳化物高温加热时不易团球化,对碳化物尺寸细化不利.添加过量Al(1.2%)形成的铁素体无法通过常规热处理消除,使高速钢淬火硬度显著降低.
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