Development of wire consumables for overlay deposition by hot-wire TIG welding

拟议的工作将涉及评估用碳化钨增强的ni基耐磨复合涂层，该涂层采用使用脉冲电流线加热器的新型焊接工艺沉积。通过确保在制造过程中保留高比例的碳化钨颗粒，可以优化这些Ni-WC复合材料的性能。这些涂层目前主要应用于等离子转移弧焊，在这种情况下，材料过热通常会导致形成各种其他脆性碳化物，其耐磨性较差。该Engage项目将确定将HC Starck Ni-WC线产品与新型热线TIG方法结合使用的可行性，并为进一步合作奠定基础。定量电子显微镜（SEM， EPMA和AES），显微硬度压痕和磨损测试的组合将评估使用HC Starck材料和带有脉冲线电源的热线TIG系统组合制成的覆盖层的性能。其目的是为后续的CRD申请设定背景并进行初步基准研究。

The proposed work will involve the evaluation of Ni-based wear resistant composite coatings reinforced with tungsten carbide, deposited using a novel welding process that uses a pulsed current wire heater. The performance of these Ni-WC composites can be optimized by ensuring a high fraction of the tungsten carbide particles are retained during fabrication. These coatings are presently applied mainly by plasma transferred arc welding, where overheating of the material often leads to the formation of a wide range of other brittle carbides with inferior wear resistance. This Engage project will establish the feasibility of using HC Starck Ni-WC wire products in conjuction with a novel hot-wire TIG approach, and set the groundwork for further collaborations. A combination of quantitative electron microscopy (SEM, EPMA, and AES), microhardness indentation, and wear testing will evaluate the performance of the overlay made using a combination of HC Starck material and the hot-wire TIG system incorporating a pulsed wire power supply. The intent is that this Engage grant would set the background and conduct preliminary benchmark studies required for a subsequent CRD application.