一种粉末冶金铁素体钢中的双组态结构（英文）.pdfVIP

Transactionsof NonferrousM etals 爨 Av冁a静ialb：leonSlniecaite、nn^n^c^，s．ecDeinceirdreiecctct．om SocietyofChina Press Trans．NonferrousMet．Soc．China22(2012)330—334 www ．tnm sc．cn Bi-modalmicrostructureinapowdermetallurgicalferriticsteel LIUFeng，LIUYong，WUHong，FANGJing-hua，ZHAODa—peng，ZHANGLiu-jie，LIUDong—hua StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,Changsha410083，China Received7January 2011；accepted26May2011 Abstract：Ferritic steelwith a nominalcomposition ofFe-14Cr一3W一0．42Ti-0-32Y was prepared by mixing gas—atomized prealloyedpowderandmechanicallyalloyedpowder．Themicrostructureismuchdifferentfxom otherferriticsteelswiththesame compositionandpreparedviaonlymechanicallyalloyedpowder．A bi-modalstructure，whichconsistsofpureferriticgrainsand martensiticgrains，wasobtainedafterhotforgingandaircooling．A phasetransformationofabcc— yfcc—}口bccwasalsodiscoveredin microstruc~ralobservation．Thebi—modalmicrostructureshowsagoodcombinationofhighstrengthandhighductility． Keywords：ferriticsteel；powdermetallurgy；phasetransformation；bi—modalmicrostructure；mechanicalproperty prepared material，and theirmechanicalproperties as 1Introduction wel1． The ferritic steels are considered potential 2Experimental candidates for elevated tempera~re applications in fusionreactors 1『—31andfissionreactors，becauseof Thenomina1composition (massrfaction)ofthe theirhighthermalconduct