The effect of post-weld heat treatment on microstructure and tensile properties of alloy C-276 welded joints fabricated by pulsed current gas tungsten arc welding

Ciência & Tecnologia dos Materiais Pub Date : 2017-05-01 DOI:10.1016/j.ctmat.2017.03.001

M. Arivarasu , M. Manikandan , A. Vinoth Jebaraj , N. Arivazhagan

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引用次数: 4

Abstract

The Mo-rich TCP phases P and μ are susceptible to hot cracking in the alloy C-276. These phases can be reduced by quashing the microsegregation of alloying element Mo in the weldment. The present study investigates the possibility of reducing the microsegregation by post weld heat treatment of the weldments. The joints were fabricated by pulsed current gas tungsten arc welding by employing different filler wires ERNiCrMo-3 and ERNiCrMo-4. The weld joints were characterized with respect to microstructure, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and tensile test. The optical microstructure revealed the fine equiaxed dendrites were observed in the fusion zone. EDS analysis revealed the presence of Mo-rich segregation in the subgrain boundary in the ERNiCrMo-3 and absence in the later. The results show that selection of temperature to dissolve Mo segregation is not sufficient in the case of ERNiCrMo-3. The tensile result shows the improved strength in both weldments compared to base metal.

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焊后热处理对脉冲电流钨极气体保护焊接C-276合金接头组织和拉伸性能的影响

C-276合金中富mo的TCP相P和μ易发生热裂。这些相可以通过消除焊件中合金元素Mo的微偏析来减少。本研究探讨了通过焊后热处理减少焊缝微偏析的可能性。采用不同填充焊丝ERNiCrMo-3和ERNiCrMo-4，采用脉冲电流气体钨极电弧焊制备接头。采用显微组织、扫描电镜(SEM)、能谱仪(EDS)和拉伸试验对焊缝进行了表征。光学显微组织显示，熔合区存在细小的等轴枝晶。EDS分析显示ERNiCrMo-3的亚晶界存在富mo偏析，而后者则不存在。结果表明，对于ERNiCrMo-3，溶解Mo偏析的温度选择是不够的。拉伸结果表明，与母材相比，两种焊接材料的强度都有所提高。

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