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1、等溫溫度對(duì)中碳貝氏體鋼組織和性能的影響摘要貝氏體鋼是指正火狀態(tài)或者連續(xù)冷卻條件下可獲得以貝氏體為基體組織的鋼。由于貝氏體本身具有良好的強(qiáng)度和韌性，貝氏體鋼才具有優(yōu)異的綜合力學(xué)性能，這促進(jìn)了貝氏體鋼的研究、開發(fā)和應(yīng)用。國內(nèi)外學(xué)者依據(jù)貝氏體相變理論對(duì)貝氏體鋼進(jìn)行了大量的研究，設(shè)計(jì)出了不同成分的鋼種和生產(chǎn)工藝，形成了不同系列的貝氏體鋼，大大推動(dòng)了貝氏體鋼的發(fā)展，本文對(duì)中碳貝氏體鋼，對(duì)其熱處理工藝、組織、性能、亞結(jié)構(gòu)等方面進(jìn)行了部分研究。本文通過對(duì)中碳貝氏體鋼進(jìn)行900℃奧氏體化后，分別在200℃、250℃、300℃、330℃進(jìn)行不同時(shí)間的等溫處理，觀察其金相組織，測定組織硬度，
2、并進(jìn)行透射分析，來探究中碳貝氏體鋼的顯微組織和其硬度等性能之間的內(nèi)在本質(zhì)聯(lián)系。結(jié)果表明：該試樣等溫處理后的室溫組織為貝氏體、馬氏體和殘余奧氏體，且隨著保溫時(shí)間的延長，馬氏體的量逐漸減少，貝氏體的量逐漸增多，并趨于穩(wěn)定；相應(yīng)的，試樣的硬度逐漸降低，也趨于穩(wěn)定。通過透射電鏡的亞結(jié)構(gòu)分析，貝氏體組織晶間沒有碳化物的析出，而是存在著薄膜狀的中含碳量的奧氏體，貝氏體的亞結(jié)構(gòu)均為納米級(jí)的精細(xì)結(jié)構(gòu)。關(guān)鍵詞：貝氏體鋼，貝氏體相變，金相組織，顯微硬度26TheEffectofIsothermalTemperatureonMicrostructureandPropertiesofMedium
3、-carbonBainiticSteelAbstractBainitesteelreferstothesteelwhichisobtainedwithbainitebeingitsmatrixstructureundernormalizedconditionorcontinuouscoolingstate.Duetobainiteit-selfowninggoodintensityandtoughness,ithasexcellentcomprehensivemechanicalproperty,whichpromotestheresearch,exploitationa
4、ndapplicationofbainitesteel.Accordingtobainitephasetransitiontheory,scholarsathomeandabroadhaddonealargenumberofresearchesonbainitesteel.Theyworkedoutdifferentsteelgradesandmanufacturingtechniques,whichdevelopedintoadifferentsetofbainitesteelandgreatlypromotedthedevelopmentofit.Inthispape
5、r,someresearcheswereconductedwhichwereabouttechnologyforheatingprocessing,organization,propertyandsuborganizationofbainitesteelwithdifferentcomposition.Basedonthemiddle-carbonbainiticsteel900℃austenite,respectively,at200℃,250℃,300℃,330℃fordifferenttimeisothermaltreatment,toobservethemicro
6、structure,thedeterminationofhardness,andtransmissionanalysis,toexplorethelinksbetweencarbonbainiticsteelmicrostructureandhardnesspropertiesoftheirinherentnature.Resultsshowthatthesamplesorganizationsatroomtemperatureafterisothermaltreatmentisbainite,martensiteandretainedaustenite,andwitht
7、heextendedholdingtime,theamountofmartensitegraduallydecreases,theamountofbainitegraduallyincreases,andtendstobestable;Accordingly,graduallythehardnessofsamplealsotendstobestable.Bytransmissionelectronmicroscopy(SEM)analysisofthesubstructure,noprecipitationofcarbidei
