国外焊管第46卷第1期2023年1月Vol.46No.1Jan.2023HANGUAN焊管WELDEDPIPEANDTUBE焊缝金属对奥氏体不锈钢失延裂纹敏感性的影响孙咸编译（太原理工大学焊接材料研究所，太原030024）摘要：采用伍德（Wood）液态金属对GTAW制作的平板堆焊试件淬火，以及光学金相、电子背散射衍射等测试手段，研究了焊缝金属对奥氏体不锈钢失延裂纹（Ductility⁃dipcracking，DDC）敏感性的影响。结果表明，伍德金属淬火在焊缝熔化区中捕获了高温显微组织细节形貌，揭示了310的淬火诱发DDC敏感性比304、316和321严重得多。304和316均凝固为柱状δ晶粒，沿δ柱状晶粒之间的边界形成了几乎连续的γ；由于γ深入δ生长，δ晶粒被γ牢固地结合在一起，阻碍沿δ晶界的DDC。321凝固为等轴δ晶粒，等轴晶粒的弯曲边界阻碍DDC。310凝固为粗直的、沿晶界几乎没有δ的γ柱状晶粒，并且晶界迁移变成为局部直的；由此产生的又长又直的裸晶界成为DDC的理想通道。归纳了奥氏体不锈钢焊缝抗DDC的两种新机制：①沿δ柱状晶的边界形成几乎连续的、非平直的γ；②凝固为等轴δ晶粒。关键词：焊缝金属；失延裂纹；奥氏体不锈钢：铁素体；奥氏体中图分类号：TG406文献标识码：ADOI:10.19291/j.cnki.1001-3938.2023.01.009EffectofWeldMetalontheSusceptibilityofAusteniticStainlessSteeltoDuctility⁃dipCrackingTranslatedbySUNXian(InstituteofWeldingConsumables,TaiyuanUniversityofTechnology,Taiyuan030024,China)Abstract:Theeffectsofweldmetalonthesensitivityofausteniticstainlesssteeltoductility⁃dipcracking(DDC)wereinvestigatedbymeansofliquidWood'smetalquenchingtheplatesurfacingspecimenmadeofGTAW,opticalmetallographyandelectronbackscatterdiffraction(EBSD)andothertestmeans.Theresultsshowthatwood'smetalquenchingcapturesthedetailedmorphologyofelevated⁃temperaturemicrostructureinweldfusionzone,andrevealsthatthesusceptibilitytoDDCinducedbyquenchingismuchmoreseverein310thanin304、316and321.304and316bothsolidifiesascolumnargrains,andresultingintheformationofanearlycontinuousγalongtheboundariesbetweencolumnarδgrains;Sinceγgrowsdeepintoδ,δgrainsarebondedtogetherfirmlybyγtoresistDDCalongδgrainboundaries.321solidifiesasequiaxedδgrains,andthetortuousboundariesofequiaxedδgrainsresistDDC.310solidifiesascoarse,s...
