Abstract

Thin sheets of N155 superalloy were welded by AMS 5832 filler metal using gas tungsten arc welding (GTAW). The purpose of this study is to investigate the characterization of microstructure and texture across the weldment using electron backscatter diffraction (EBSD) technique. The results indicated that N155 superalloy with the crystal lattice (FCC) experienced annealing process before the welding, which made a lot of coherent twins be created in the base metal due to low stacking fault energy (SFE). Moreover, the coherent twins were created mainly in the heat-affected zone by the presence of cumulative stresses of the molten pool solidification shrinkage. Having the same crystal lattice (FCC), the base metal and the weld metal resulted in the formation of epitaxial grains with the preferred growth direction in the weld metal.

中文翻译：

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含奥氏体填充金属的N155高温焊接接头的组织和织构特征

摘要

使用气体钨极电弧焊（GTAW），通过AMS 5832填充金属焊接N155高温合金薄板。这项研究的目的是研究使用电子背散射衍射（EBSD）技术对焊件的微观结构和织构进行表征。结果表明，具有晶格（FCC）的N155高温合金在焊接前经历了退火过程，由于堆垛层错能（SFE）低，使得在母材中产生了许多相干孪晶。而且，由于熔池凝固收缩的累积应力的存在，相干孪晶主要在热影响区产生。具有相同的晶格（FCC），贱金属和焊接金属导致在焊接金属中形成具有优选生长方向的外延晶粒。