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1、材料热处理技术Material&HeatTreatment2010年8月ER110S-1焊丝拉拔过程中退火工艺及机理探讨1,21,21,2喻兰英,罗宏,罗昌森(1.四川理工学院材料与化学工程学院,四川自贡643000;2.材料腐蚀与防护四川省高校重点实验室,四川自贡643000)摘要:用差热分析法确定了ER110S-1焊丝的相变点,通过扫描电镜观察分析了断口的形貌特征。进行多种再结晶退火和等温球化退火,用金相显微镜观察金相组织,测定维氏硬度和晶粒度,从而确定最佳球化退火工艺。研究表明:ER110S-1焊
2、丝最佳球化退火工艺为660℃保温12h,随炉冷至380℃空冷;ER110S-1焊丝进行再结晶退火的球化效果优于等温球化退火;ER110S-1焊丝预拉拔产生的塑性变形可以促进再结晶退火的球化率。关键词:ER110S-1焊丝;拉拔;再结晶退火;等温球化退火;球化机理中图分类号:TG156.2文献标识码:A文章编号:1001-3814(2010)16-0168-04DiscussiononSpheroidizingAnnealingProcessandMechanismofER110S-1WeldingWir
3、einDrawingProcess1,21,21,2YULanying,LUOHong,LUOChangsen(1.InstituteofMaterialsScienceandChemistryEngineering,SichuanUniversityofScienceandEngineering,Zigong643000,China;2.KeyLaboratoryofMaterialCorrosionandProtectionofSichuanCollegesandUniversity,Zigong6
4、43000,China)Abstract:ThephasetransformationtemperatureofER110S-1weldingwirewasdeterminedbyDSC,andthefracturemicrostructureofER110S-1weldingwirewasobservedbySEM.Thedifferentheattreatmenttechnologiesofrecrystallizationannealingandisothermalspheroidizingwer
5、econducted,themicrostructureofER110S-1weldingwirewasobserved,andtheVickershardnessandcrystalsizeweremeasured,andtheoptimizationrecrystallizationannealingtechnologywasdetermined.Theresultsshowthattheoptimizationrecrystallizationannealingtechnologyisasfoll
6、ow:heatingat660℃for12h,coolinguntil380℃infurnaceandthencoolinginair;theeffectofrecrystallizationannealingisbetterthanthatofisothermalspheroidizingannealing;thedeformationcanpromotethespheroidizationrateinpre-drawing.Keywords:ER110S-1weldingwire;drawing;r
7、ecrystallizationannealing;isothermalspheroidizingannealing;spheroidizingmachanismER110S-1焊丝是近年来新兴的一种低碳高强化学成分(质量分数,%)为:0.06~0.08C,1.53~1.76Mn,度合金焊丝,具有优良的焊接工艺性能,广泛用于0.45~0.49Si,≤0.005S,≤0.010P,0.25~0.31Cr,2.10~760MPa级低合金高强度钢的焊接。成品焊丝是由2.16Ni,0.45~0.54Mo。准5.
8、6mm的盘条拉拔至准1.2mm得到的,为了获得1.2试验方法良好的塑性,拉拔过程中进行了一次球化退火。目取原材料约50mg用丙酮清洗干净,用前国内外对过共析钢的球化退火工艺研究已经非常Q600TGA/DSC差示扫描量热仪以10K/min加热至成熟,但对低碳钢的球化退火研究很少。本文通过1100℃,测定其相变点。理论分析和多种球化退火实验,得到ER110S-1的截取350mm作为拉伸试样,进行完全退火最佳球化退火工艺,初步探讨了低碳钢的球化机