2023,Vol.37,No.13www.mater-rep.com21110021-1基金项目:国家自然科学基金(51574449)ThisworkwasfinanciallysupportedbytheNationalNaturalScienceFoundationofChina(51574449).changcluj@163.comDOI:10.11896/cldb.21110021TiCNp增强高铬铸铁复合材料的制备与性能赵吉康,肖平安,顾景洪,钟斯远湖南大学材料科学与工程学院,长沙410082本工作以TiCNp和20Cr高铬铸铁粉末为原料,采用压制和超固相液相烧结(SLPS)工艺,制备含10%~30%(质量分数,下同)TiCNp的高铬铸铁复合材料,系统研究了增强相含量和烧结温度对复合材料致密化行为、显微组织、物相组成和力学性能的影响规律。研究结果表明,通过真空液相烧结可以制备出相对致密度均达到97.5%以上的各成分复合材料,物相主要由TiCN、Cr7C3碳化物、马氏体和少量奥氏体组成;随着增强相添加量逐步增加,TiCNp沿晶界分布,逐渐形成网状分布结构,而Cr7C3越来越多地在烧结过程中没有熔化的合金基体中析出和粗化;这使得复合材料的硬度线性上升,而抗弯强度和冲击韧性则降低。当TiCNp添加量为30%时复合材料的力学性能可以达到硬度87.8HRA,抗弯强度1304MPa,冲击韧性2.35J/cm2。关键词复合材料TiCNpPM高铬铸铁力学性能显微组织中图分类号:TB331文献标识码:APreparationandPropertiesofTiCNpReinforcedHighChromiumCastIronCompositesZHAOJikang,XIAOPing’an,GUJinghong,ZHONGSiyuanSchoolofMaterialsScienceandEngineering,HunanUniversity,Changsha410082,ChinaTakingTiCNpand20Crhighchromiumcastironpowderasrawmaterials,reinforcedhighchromiumcastironwith10wt%—30wt%TiCNpinthisworkwasfabricatedbysupersolidusliquidphasesintering(SLPS)method.TheinfluenceofTiCNpadditionamountandsinteringtem-peratureonitsdensification,constituentphase,microstructureandmechanicalpropertieshavebeeninvestigatedsystematically.TheresultsshowthattherelativedensityoftheTiCNpsinteredthroughSLPStechniquecouldreachto97.5%,andit’sphasecompositioncontainingTiCN,Cr7C3carbides,martensiteandasmallamountofaustenite.Besides,withtheincrementofTiCNpadditionamount,TiCNpgraduallyforminganetdistri-butionalongthegrainboundary.Meanwhile,moreandmoreCr7C3carbideswereprecipitatedandcoarsenedintheunmeltedalloymatrix,whichcouldleadtothelinearlyincre...