09cuptire钢晶粒超细化研究

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1、试样的力学性能的对比分析，发现Nb确实能够有效的细化09CuPTIRE钢的晶粒，并有效的提高其拉伸强度性能同时并不降低其韧性。钢中加入微量的Nb能有助于实现变形诱导铁索体相变，Nb元素通过阻止奥氏体再结晶使车LaIJ变形能可保留于奥氏体中，通过变形能的积累使奥氏体体系自由能升高，并且改善其形变诱导铁素体相变的热力学和动力学条件，实现形变诱导铁素体相变(DIFT)。D1FT工艺可以提高钢的强度，而且并不损害钢的延伸率，试验结果显示：对于09CuPTiRE钢的屈服强度，细化后平均达到了464MPa，而抗拉强度则达到了平均57

2、1MPa，钢的延伸率为平均27．2％。比没有采用形变诱导相变的常规工艺都有很大程度的提高。本研究还通过理论推导获得了DIFF过程中低碳含量钢中形变能的聚积即储存能的估计公式，以及DIFT相变包括晶胚形成的晶核和晶核的长大所形成的新相的体积分率公式。关键词：09CuPTiRE钢，超细晶粒化。形变诱导相变，储存能，Nb添加物IIAbstractSteelisanextremelyimportantmaterial．Asthenationaleconomydevelops，thenumberandperformanceofst

3、eelmaterialshavesethigherrequirements．Currently,theyieldstrengthlevelofcarbonstructuralsteelis200MPagrade，thatofhigh-intensitylow·alloysteelis400MPagrade．andtensilestren【gthofalloystructuralsteelis800MPagrade．Inordertomeetfutureeconomicandsocialdevelopmentneeds，t

4、heneedforresearchanddevelopllaentofanewgenerationofhigh—intensityandlong-lifesteel．Againstthisbackgroundanewgenerationofsteelmaterials’’supersteel”．Thebasicideasofsupersteeldevelopmentare：throughhigh—cleansing,homogeneous，andceramiccrystaltosignificantlyincreaset

5、heperformanceofsteel．Thetraditionalmethodssteelmaterialsformicroorganizationalstrengtheningare：useofpointfaultsinsteelforstrengtheningitbyproducingsolidsolutionenhancement，nsgoflinefaultsinsteelforstrengtheningitbyproducingdislocationenhancement，useoffacefaultsin

6、steelforstoppingthemoveofdislocationanduseofspacefaultsbyproducingprecipitation．Grainrefinementistheonlywaytoenhancetheresilienceofmetalmaterialsintensitywithoutsacrificing．Currently,theconsistentwaysoftheceramicgrainrefinementofsteelare．"MicroalloyingProcessing，

7、ElectromageticProcessing，Thermo—Mecl口IanicalProcessing(TMP)，Microalloying．ThestudyusesDeformatinnInducedFerriteTransformation(DIFT)withmaterialstotraceelementsofNbin09CuPTiREsteelgrainrefinementrole，andthestrengtheningofsteel，andtheeffectofgrainstorageenergytogro

8、wingofnuclei，andinthecontextofstrengtheningtheroleofthecertificationtest‘data．09CuPTiREsteelisusedintheproductionofrailvehicles，tensilestrengthof390MPaclass09C