工艺研究August,20232023年8月RECHULIJISHUYUZHUANGBEIVol.44,No.4热处理技术与装备第44卷第4期DP1000超高强度双相钢激光对接焊工艺研究许新军,宋涛2(1.歌尔股份有限公司,山东潍坊262000;2.潍柴雷沃智慧农业科技股份有限公司,山东潍坊262000)摘要:对DP1000超高强度双相钢进行了激光对接焊试验,并测试分析了焊后试样的显微组织和机械性能。结果表明,DP1000超高强度双相钢焊缝接头熔合区组织为粗大的板条状马氏体,还存在少量的贝氏体、残余奥氏体以及先共析铁素体组织。焊接区域依次分为:过热区、部分相变区、回火区。过热区的组织为板条状马氏体,其他两个区域组织均为回火马氏体和铁素体,同时导致焊接接头显微硬度降低,出现了软化。热影响区的显微硬度最低,拉伸试验结果显示,断裂往往出现在热影响区。DP1000超高强度双相钢的最佳焊接工艺参数为:激光功率1.7kW,焊接速度6~10mm/s,保护气体流量20L/min。关键词:DP1000超高强度双相钢;激光焊接;显微组织;机械性能中图分类号:TG456.7文献标识码:A文章编号:1673-4971(2023)04-0001-06ResearchonLaserButtWeldingProcessofDP1000UltraHighStrengthDualPhaseSteelXUXin-jun',SONGTao?(1.GoertekCo.,Ltd.,WeifangShandong262000,China;2.WeichaiLovolIntelligentAgriculturalTechnologyCo.,Ltd.,WeifangShandong262000,China)Abstract:LaserbuttweldingexperimentswereconductedonDP1000ultrahighstrengthdualphasesteel,andthemicrostructureandmechanicalpropertiesoftheweldedspecimenswereanalyzedandtested.TheresultsshowedthatthefusionzonestructureofDP1000ultrahighstrengthdualphasesteelweldedjointwascoarselathmartensite,withasmallamountofbainite,residualausteniteandproeutectoidferrite.Theweldingareawassequentiallydividedintooverheatingzone,partialphasetransformationzoneandtempe-ringzone.Themicrostructureoftheoverheatingzonewaslathmartensite,andthemicrostructureoftheothertwoareaswastemperedmartensiteandferrite.Atthesametime,themicrohardnessoftheweldedjointdecreasedandsofteningoccured.Themicrohardnessoftheheat-affectedzonewasthelowest,andthetensiletestresultsshowedthatthefractureoftenoccuredintheheat-affectedzone.TheoptimalweldingprocessparametersforDP1000ultrahighstrengthdualphasesteelwerelaserpowerof1.7kW,wel...