双相不锈钢脉冲激光焊接焊缝金属显微组织的发展 毕业论文外文翻译

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1、拟建中的阜阳市中国XXXX国际服装城依托中国XX国际服装城，拟建成为皖西北地区规格最高、规模最大、商务及功能最优的现代化、国际化服装专业市场，建设规模占地约128亩，建筑面积约25万平方米，项目总投资约5亿元人民币。经过1--2年的开发建设，能达到正常运营期的中国XX.XX国际服装城将吸纳全国和世界各地的经销商、代理商企业物流总部等500—1000家，预计年交易额实现68亿元人民币，每年实现税收8000—10000万元人民币，每年实现利润1.68亿元人民币，实现就业和创业人员约2万以上。英文原文DevelopmentofWeldMetalMicrostructure

2、sinPulsedLaserWeldingofDuplexStainlessSteelF.Mirakhorli,F.MalekGhaini,andM.J.Torkamany(SubmittedOctober30,2011)ThemicrostructureoftheweldmetalofaduplexstainlesssteelmadewithNd:YAGpulsedlaserisinvestigatedatdifferenttravelspeedsandpulsefrequencies.Intermsofthesolidificationpattern,thewel

3、dmicrostructureisshowntobecomposedoftwodistinctzones.Thepresenceoftwocompetingheattransferchannelstotherelativelycoolerbasemetalandtherelativelyhotterpreviousweldspotisproposedtodeveloptwozones.Athighoverlappingfactors,anarrayofcontinuousaxialgrainsattheweldcenterlineisformed.Atlowover

4、lappingfactors,inthezoneofhighercoolingrate,ahigherpercentageofferriteistransformedtoaustenite.Thisisshowntobebecausewithextremecoolingratesinvolvedinpulsedlaserweldingwithlowoverlapping,theferrite-to-austenitetransformationcanbelimitedonlytothegrainboundaries.Keywordsduplexstainlessst

5、eel,microstructure,pulsedlaserwelding,solidificationIntroduction　　Duplexstainlesssteels(DSS)arewidelyusedinpetro-chemicalandchemicalprocessingsbecauseofthecombinationofcorrosionresistanceandadvantageousmechanicalproper-ties.Thewroughtalloysmicrostructureatroomtemperatureiscomposedofaust

6、eniteandferritephases(Ref1,2).However,themicrostructureresultingfromafusionweldingprocesscanbesignificantlydifferentbecauseofthecoolingratesinvolved(Ref3-5).Figure1depictsatypicalDSSalloythatwouldsolidifycompletelyintoferriteandthen,whilecoolingthroughsolidstatetransformation,itpartiall

7、ytransformsintoaustenite(Ref1,2).Consideringthecomparativelyhighercoolingratesinvolvedinweldingprocesses,theweldmetalandtheHAZmicrostructurecouldcontainhigheramountsofferritephasethanthebasemetal.ThisalsocanaffectthemechanicalandcorrosionresistancepropertiesofDSSwelds(Ref2-7).　　Weldi