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1、第34卷第2期北京科技大學(xué)學(xué)報Vo1．34No．22012年2月JournalofUniversityofScienceandTechnologyBe
2、jingFeb．2012調(diào)質(zhì)低碳貝氏體鋼的組織和性能徐立善余偉圜張燁銘盧小節(jié)北京科技大學(xué)高效軋制國家工程研究中心，北京100083函通信作者，E-mail：yuwei@nercar．ustb．edu．cn摘要研究了C—Mn—Mo—Cu—Nb—Ti—B系低碳微合金鋼915oC淬火和490～640℃回火的調(diào)質(zhì)工藝對鋼的組織及力學(xué)性能的影響．用掃描電鏡和透射電鏡對實驗鋼的組織、析出
3、物形態(tài)和分布以及斷口形貌進行觀察，采用x射線衍射儀分析鋼中殘余奧氏體的體積分?jǐn)?shù)．結(jié)果表明：調(diào)質(zhì)后，實驗鋼獲得貝氏體、少量馬氏體及殘余奧氏體復(fù)相組織，貝氏體板條寬度只有250nm，殘余奧氏體的體積分?jǐn)?shù)隨著回火溫度的升高而降低，經(jīng)淬火與520℃回火后殘余奧氏體的體積分?jǐn)?shù)為2．1％．調(diào)質(zhì)后析出物的數(shù)量激增，6一-15am的析出物占70％以上．實驗鋼經(jīng)過915℃淬火與520℃回火后，其屈服強度達到915MPa，抗拉強度990MPa，一40qC沖擊功為95J．細(xì)小的析出物及窄的板條提高了鋼的強度．板條間有殘余奧氏體存在，改善了實驗鋼的
4、韌性．關(guān)鍵詞高強鋼；熱處理；殘余奧氏體；析出物；微觀組織；力學(xué)性能分類號TG142．1MicrostructureandmechanicalpropertiesoflowcarbonbainitesteeltreatedbyquenchingandtemperingXULi—shan，YUWei，ZHANGYe．ming，LUXiao-fieNationalEngineeringResearchCenterforAdvancedRollingTechnology，UniversityofScienceandTechnolog
5、yBeijing，Beijing100083，China圜Correspondingauthor，E-mail：yuwei@nercar．ustb．edu．enABSTRACTTheeffectsofquenchingat915℃andtemperingat490～640℃onthemicrostructureandmechanicalpropertiesofC—Mn—Mo-Cu-Nb—Ti—Bbasedlow—carbonmicroalloyedsteelwereinvestigated．Themierostructure
6、．theshapeanddistributionofprecipi—tates，andthefractographofthesteelwereobservedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM)．ThevolumefractionofretainedaustenitewasmeasuredbyX-raydiffractometry(XRD)．Theresultsshowthatamuhiphasemicrostructu
7、rewithbainite，martensiteandretainedausteniteisachievedafterquenchingandtempering．Thebainitelathis250nminwidth．Thevolumefractionofretainedaustenitedecreaseswiththetemperingtemperaturerising．a(chǎn)nditis2．1％aftertemperingat520℃．Thequantityofprecipitatesincreasessharplyaft
8、erheattreatment．a(chǎn)ndtheproportionofprecipitatesinasizerangeof6to15nmisabove70％．Afterquenchingat915oCandtemperingat520oC，theteststeelhasayieldstrengthof915MPa，atensilestrengthof990MPaanda一40oCimpactenergyof95J．Fineprecipitatesandnarrowlathbainitecanenhancethestrength
9、．buttheretainedausteniteexistingbetweenbainitelathscansignificantlyimprovethetoughness．KEYWORDShigbstrengthsteel；heattreatment；retainedaustenite；
