工程机械刃具钢30CrMnB焊接接头的显微组织和力学性能.pdfVIP

HotWorkingTechnology2020,Vol.49,No.23

工程机械刃具钢30CrMnB焊接接头的

显微组织和力学性能

姚宙，刘红艳，杜琦铭，张卫攀，徐桂喜

(河钢集团邯郸公司技术中心，河北邯郸056000)

摘要：分别采用ER50-焊丝和GM120焊丝对刃具钢30CrMnB进行C02气体保护焊，研究焊接接头的力学性

能和组织。结果表明：采用ER50-焊丝焊接的接头强度大于焊材强度，小于母材强度；焊缝和热影响区的冲击功是母

材的1.3〜4倍；焊缝硬度低于热影响区和母材的；焊缝组织为粒状贝氏体+先共析铁素体。采用GM120焊丝焊接的接

头强度同焊材强度相当，但小于母材强度；焊缝和热影响区的冲击功是母材的1.2〜1.7倍；焊缝硬度高于细晶区的但低

于粗晶区的，焊缝组织为细小的板条贝氏体+马氏体组织。

关键词：30CrMnB;焊接接头；显微组织；力学性能

DOI:10.14158/j.cnki.1001-3814.

•中图分类号：TG444+.73;TG457.11文献标识码：A文章编号：1001-3814(2020)23-0122-03

MicrostructureandMechanicalPropertiesofWeldedJoints

ofConstructionMachineryCuttingToolSteel30CrMnB

YAOZhou,LIUHongyan,DUQiming,ZHANGWeipan,XUGuixi

(TechnicalCenterofHBISGroupHanSteel,Handan056000,China)

Abstract：3OCrMnBofcuttingtoolsteelwereweldedbyC02gas-shieldweldingwithER50-6weldingwireandGM120

weldingwirerespectively.Themechanicalpropertiesandmicrostructureoftheweldedjointswerestudied.Theresultsshow

thatthestrengthofthejointweldedwithER50-6wireisbiggerthanthatofweldingmaterialandlessthanthatofbase

material;theimpactenergyofweldandHAZis1.3-4timesofthatofthebasemetal;thehardnessofweldislowerthanthat

ofheataffectedzoneandbasemetal;theweldmicrostructureisgranularbainite+proeutectoidferrite.Thestrengthofthejoint

weldedwithGM120wireissimilartothatofweldingmaterialbutlessthanthatofbasematerial;theimpactenergyofweld

andHAZis1.2-1.7timesofthatofthebasemetal;thehardnessofweldishigherthan