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1、第17卷第2期材料科學(xué)與工藝Vol117No122009年4月MATERIALSSCIENCE&TECHNOLOGYApr.,2009管線鋼在役焊接熱影響區(qū)顯微組織的熱模擬研究12陳玉華,王勇(1.南昌航空工業(yè)學(xué)院材料科學(xué)與工程學(xué)院,江西南昌330063,E2mail:ch.yu.hu@163.com;2.中國(guó)石油大學(xué)(華東)機(jī)電工程學(xué)院,山東東營(yíng)257061)摘要:為探討在役焊接這種嚴(yán)酷的焊接條件下管線鋼焊接熱影響區(qū)顯微組織的變化,采用焊接熱模擬技術(shù)、金相分析及透射電鏡對(duì)比研究了X70管線鋼在役焊接熱影響區(qū)和常規(guī)焊接熱影響區(qū)的金相組織和精細(xì)結(jié)構(gòu).結(jié)果表明,在役焊
2、接的快速冷卻只對(duì)粗晶區(qū)的金相組織產(chǎn)生了較大影響,而對(duì)過(guò)渡區(qū)、細(xì)晶區(qū)和類母材區(qū)的金相組織幾乎沒(méi)有影響.金相顯微鏡下兩者粗晶區(qū)的組織均為貝氏體鐵素體和粒狀貝氏體,但各組織的形態(tài)和數(shù)量不同.在透射電鏡下觀察,兩者粗晶區(qū)的精細(xì)結(jié)構(gòu)有較大差異,在役焊接粗晶區(qū)生成了少量細(xì)小的橫穿貝氏體鐵素體板條的板條馬氏體,常規(guī)焊接粗晶區(qū)生成了少量的塊狀鐵素體組織.關(guān)鍵詞:在役焊接;X70管線鋼;熱影響區(qū);顯微組織;精細(xì)結(jié)構(gòu)中圖分類號(hào):TG14211;TG406文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1005-0299(2009)02-0178-03Microstructureofheat2affected
3、zoneofin2serviceweldingontopipelinesteelbyweldingthermalsimulation12CHENYu2hua,WANGYong(1.SchoolofMaterialScienceandEngineering,NanchangInstituteofAeronauticalTechnology,Nanchang330063,China,E2mail:ch.yu.hu@163.com;2.CollegeofMechanicalandElectronicEngineering,ChinaUniversityofPetrole
4、um,Dongying257061,China)Abstract:Tounderstandthemicrostructurealterationinheat-affectedzone(HAZ)ofin-serviceweldingontopipelinesteel,weldingthermalsimulation,metallographicanalysisandtransmissionelectronmicroscope(TEM)wereusedtostudythemetallurgicalstructureandsubstructureinHAZofin-se
5、rviceweldingandroutinewelding.Theresultsshowthatahighercoolingspeedofin-serviceweldingjointonlyaffectsthemi2crostructureofcoarsegrainheat-affectedzone(CGHAZ)andalmostdoesn’taffectthemicrostructureintransitionzone,finegrainzoneandsimilarbasemetalzone.MetallurgicalmicrostructuresinbothH
6、AZofin-serviceweldingandHAZofroutineweldingaregranularbainiticandbainiticferrite,buttheshapeanda2mountofthetwokindsofmicrostructuresaredifferentineachHAZ.MuchmoredifferencebetweenthesubstructureinCGHAZofin-serviceweldingsampleandroutineweldingsamplewereobservedbyTEM.Thereareasmallamou
7、ntoffinelathmartensitecrossingthelathofbainiticferriteinCGHAZofin-serviceweldingandasmallamountofmassiveferriteinCGHAZofroutinewelding.Keywords:In2servicewelding;X70pipelinesteel;Heat2affectedzone;Microstructure;Substructure[1]在役焊接,即對(duì)發(fā)生腐蝕或破壞的管道在運(yùn)行條件下(不停輸、帶壓)直接進(jìn)行焊接修復(fù).對(duì)運(yùn)行管線進(jìn)行在役焊接修復(fù)可保持管道
8、運(yùn)行的收稿
