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1、第39卷第10期Vol.39No.102014年10月HEATTREATMENTOFMETALSOctober2014殜檴檴檴檴殜檴檴工藝研究檴檴殜檴檴檴檴殜熱處理工藝對低碳馬氏體鋼沖擊性能的影響1221,2彭良貴,劉偉杰,吳淑通,劉相華(1.東北大學(xué)軋制技術(shù)及連軋自動化國家重點實驗室,遼寧沈陽110819;2.東北大學(xué)研究院,遼寧沈陽110819)摘要:對一種低碳試驗鋼分別采用淬火、回火、Q&P、深冷等不同工藝進(jìn)行熱處理,并借助落錘沖擊試驗機(jī)、掃描電鏡、X射線衍射、透射電鏡等手段對其沖擊性能、斷口形貌和顯微組織進(jìn)行研究。結(jié)果表明,深冷處理能使鋼中殘留奧氏體明顯減少,但沖擊吸
2、收能量的變化不明顯。經(jīng)過Q-P處理可以顯著提高殘留奧氏體量,同時改善試驗鋼沖擊性能。經(jīng)過280℃×5min回火處理后,殘留奧氏體量雖有所降低,但沖擊性能卻有較大的提高。對低碳馬氏體鋼而言,可以通過Q-P處理提高殘留奧氏體的熱穩(wěn)定性來改善其沖擊性能,也可以通過低溫回火處理促使ε過渡型碳化物的析出或者形成退火孿晶來提高其沖擊性能。關(guān)鍵詞:沖擊性能;殘留奧氏體;淬火-配分(Q-P)工藝;回火;深冷處理中圖分類號:TG142.1文獻(xiàn)標(biāo)志碼:A文章編號:0254-6051(2014)10-0001-06Effectofheattreatmentprocessonimpactproper
3、tyoflowcarbonmartensitesteel1221,2PengLianggui,LiuWeijie,WuShutong,LiuXianghua(1.TheStateKeyLaboratoryofRollingandAutomation,NortheasternUniversity,ShenyangLiaoning110819,China;2.NortheasternUniversityResearchAcademy,ShenyangLiaoning110819,China)Abstract:Alow-carbonsteelwastreatedbyquenchin
4、g,tempering,Q&P(quenchingandpartitioning)processandcryogenictreatmentrespectively.Theimpactproperty,fracturemorphologyandmicrostructureofthetestedsteelwereinvestigatedwiththehelpofdropweightimpacttestingmachine,SEM(scanningelectronmicroscope),XRD(X-raydiffraction)andTEM(transmissionelectron
5、microscope).Theresultsshowthatthevolumefractionofretainedausteniteofthetestedsteeldecreasesconsiderablyaftercryogenictreatment,butitsimpactpropertydoesnotchangeobviously.However,afterQ-Ptreatment,thevolumefractionofretainedausteniteincreasessignificantlyandmeanwhiletheimpactpropertyisimprov
6、ed.Moreover,theimpactpropertyofthetestedsteelincreasesdramaticallyaftertemperedat280℃for5mineventhoughthevolumefractionofretainedaustenitereducesslightly.Therefore,theimpactpropertyoflow-carbonmartensitesteelcanbeimprovedbyQ-Pprocesswhichstrengthensthestabilityofretainedausteniteandalsobylo
7、wtemperaturetemperingwhichresultsinεcarbideprecipitationorannealingtwinsformation.Keywords:impactproperty;retainedaustenite;quenchingandpartitioning(Q-P)process;tempering;cryogenictreatment[1-2]近年來,國內(nèi)外學(xué)者對汽車先進(jìn)高強(qiáng)鋼(AHSS)措施。通過合理的組織調(diào)控獲得硬基體與亞穩(wěn)奧進(jìn)行了深入的研究,對鋼鐵材料組織