Q&P钢热处理工艺的开发进展.pdf

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1、2009年第1期世界钢铁Q&P钢热处理工艺的开发进展DevelopmentsintheQuenchingandPartitioningProcessJohnGSpeerandDavidKMatlock科罗拉多矿业学院先进钢工艺和产品研发中心，美国，戈尔登，CO80401(AdvancedSteelProcessingandProductsResearchCenter，ColoradoSchoolofMines，Golden，CO80401，USA)摘要：Q&P钢的工艺概念已提出了有些年了，它作为一种热处理工艺

2、，生产的组织具有马氏体和富C的亚稳残余奥氏体。工艺包括：控制淬火形成部分的马氏体，然后热处理以使C从过饱和的马氏体中转移到残余奥氏体中。潜在的应用包括具有好的成型性和抗断裂的高强度钢。应用该工艺可生产薄板和厚板，以及用从长锻材生产热处理元件，甚至于铸铁。自2003年一直在实验室研究，早期的工作结果已有发表。近期的研究主要集中于机理方面的细节。国际范围的独立团队在此研究领域也有很多进展。Abstract：ThequenchingandpartitioningorQ&Pprocessconcepthasbeend

3、evelopedoverthepastfewyears，asaheat—treatmenttoproducemartensiticmicrostructureswithcarbon—enrichedmetastableretainedaustenite．Theprocessinvolvespartialmartensiteformationbycontrolledquenching，followedbyathermaltreatmenttoallowcarbontransportfromthe(supersa

4、turated)martensiteintotheremainingaustenite．Potentialapplicationsinvolvehighstrengthwhereretainedaustenitemaybebeneficialforformability，fractureresistance，etc．Theprocessmaybeapplicabletoproductionofsteelsheetandplateproducts，aswellasheattreatedcomponentspro

5、ducedfromlongproductforgings，andevencast—iron．Theconcepthasbeenstudiedintheauthors’laboratoriessinceabout2003andaseriesofpubli-cationsisavailabledocumentingmuchoftheearlywork．Morerecentstudieshavefocusedonunder—standingmechanisticdetails，andotherindependent

6、researchgroupsarenowalsomakingadvancementsinthisfield．Keywords：：quenching；partitioning；retainedausteniteOIntrOductiOnThroughthisconcept，amartensiticmicrostructurea—Thequenchingandpartitioningprocesswasde—longwithmetastableretainedausteniteisintendedtovelope

7、dearlierinthisdecadeasanalternativebepresentafterfinalquenching．meanstoproducemicrostructureswithsubstantialre．tainedaustenitefractions．incombinationwithamartensiticmatrix【．rheprocessconsistsofa2．stepheattreatment．illustratedbytheschematicther．malprofileinF

8、ig．1．Afterreheatinginordertoob-tainafullyausteniticorintercriticalmicrostrncture，thesteeliSquenchedtoasuitablepre—determinedtemperatureintheregionbetweentheMsandMftem-peratures．Thedesiredmicrostrncture