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Gas turbine blade hardfacing process development and microstructural study of the interface.

机译：燃气轮机叶片堆焊工艺的发展和界面的微结构研究。

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Extending the life of gas turbine blades by preventing wear damage that could lead to cracking or material loss poses many cost benefits. Hardfacing is a weld overlay method that can provide the necessary wear resistance in critical regions on a turbine blade. The development of an efficient and sound hardfacing process for specific material combinations of IN738 with wear resistant alloys Stellite 694 and Tribaloy T-800 using plasma transferred arc (PTA) welding was the objective of this research. Taguchi design of experiment methods were used to optimize processing parameters for PTA hardfacing, resulting in a set of predicted parameter level settings for each material combination. In addition to the process development, the interface microstructure was studied for varying degrees of mixing/dilution. Using analytical techniques such as differential scanning calorimetry, scanning electron microscopy, and energy dispersive spectroscopy, mixtures of different ratios of hardfacing alloy to substrate alloy were examined for any occurrence of deleterious phases. Mixtures resembling a high dilution rate (50 wt% of hardfacing material in the substrate) exhibited microstructures that indicated the presence of both topologically close-packed and adverse carbide phases.
机译：通过防止可能导致破裂或材料损失的磨损损坏来延长燃气涡轮机叶片的寿命，具有许多成本优势。堆焊是一种堆焊方法，可以在涡轮叶片的关键区域提供必要的耐磨性。这项研究的目的是开发一种针对IN738与Stellite 694和Tribaloy T-800耐磨合金的特殊材料组合的高效，合理的表面堆焊工艺，这是本研究的目标。 Taguchi设计了实验方法，用于优化PTA堆焊的加工参数，从而为每种材料组合提供了一组预测的参数水平设置。除了工艺开发之外，还研究了界面微观结构的混合/稀释程度。使用诸如差示扫描量热法，扫描电子显微镜和能量色散光谱法之类的分析技术，检查了不同比例的堆焊合金与基体合金的混合物是否存在有害相。类似于高稀释率的混合物（基材中表面硬化材料的50 wt％）显示出微观结构，表明存在拓扑紧密堆积和不利的碳化物相。

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