TiC弥散强化沉淀硬化不锈钢组织和性能研究的中期报告摘要：本文介绍了TiC弥散强化沉淀硬化不锈钢组织和性能研究的中期报告。通过采用机械合金化和高能球磨技术制备出含有不同质量分数的TiC颗粒的球形粉末，并利用真空感应熔炼法制备出了含有不同量的TiC颗粒的不锈钢试件。研究表明，TiC颗粒与不锈钢基体间可形成结合良好的界面，TiC颗粒的分布均匀性和大小几乎不受球形粉末制备过程中的超声处理场强和时间的影响。通过热处理试验和材料表征，发现TiC颗粒的加入可明显改善不锈钢的硬度和强度，但会对不锈钢的塑性产生一定负面影响。此外，TiC颗粒的大小和质量分数对不锈钢的性能有一定的影响。当TiC颗粒的大小小于40nm且质量分数为1%时，不锈钢的力学性能最佳，并具有良好的韧性和耐蚀性。关键词：TiC颗粒；不锈钢；沉淀硬化；球形粉末；力学性能Mid-TermReportonMicrostructureandPropertiesofTiC-DispersionStrengthenedPrecipitationHardeningStainlessSteelAbstract:Thispaperpresentsamid-termreportonthemicrostructureandpropertiesofTiC-dispersionstrengthenedprecipitationhardeningstainlesssteel.SphericalpowderscontainingTiCparticleswithdifferentmassfractionswerepreparedbymechanicalalloyingandhigh-energyballmilling,andstainlesssteelspecimenscontainingdifferentamountsofTiCparticleswerepreparedbyvacuuminductionmelting.ThestudyshowedthatTiCparticlescanformagoodinterfacewiththestainlesssteelmatrix,andtheuniformityandsizeoftheTiCparticledistributionisalmostunaffectedbytheultrasonictreatmentduringthepreparationofsphericalpowders.ThermaltreatmentexperimentsandmaterialcharacterizationrevealedthattheadditionofTiCparticlescansignificantlyimprovethehardnessandstrengthofstainlesssteel,butcanhaveanegativeimpactonitsplasticity.Inaddition,thesizeandmassfractionofTiCparticleshaveacertaineffectonthepropertiesofstainlesssteel.WhenthesizeofTiCparticlesislessthan40nmandthemassfractionis1%,themechanicalpropertiesofstainlesssteelareoptimal,anditalsoexhibitsgoodtoughnessandcorrosionresistance.Keywords:TiCparticles;stainlesssteel;precipitationhardening;sphericalpowders;mechanicalproperties.