开发用于生产大型非合金钨部件的线+弧增材制造技术
Development of Wire + Arc Additive Manufacturing for the production of large-scale unalloyed tungsten components
摘要：
由于材料的低温脆性和高氧化敏感性，耐火金属部件的制造存在一些限制。粉末冶金通常是选择的工艺过程。最近，Wire + Arc增材制造已被证明能够通过使用高质量的线材作为原料，以相对较低的成本生产完全致密的大型金属零件。在这项研究中，这种技术已被用于生产大型钨线性结构。已经研究并优化了送丝方向，以获得无缺陷的钨沉积物。特别地，与侧面送丝相比，正面送丝消除了孔隙和微裂纹的发生。对镀层的显微结构、缺陷的产生及其与沉积工艺的关系进行了讨论。尽管重复的热循环和材料固有的脆性，沉积结构是免费的内部裂纹和层的尺寸是稳定的，在整个沉积过程中。这使得生产一个相对较大的组件，尺寸为210 × 75 × 12毫米。这项研究表明，线+电弧增材制造可用于生产大规模的非合金钨零件通过完全融合，提出了一个潜在的替代粉末冶金制造路线。
英文摘要：
The manufacturing of refractory-metals components presents some limitations induced by the materials characteristic low-temperature brittleness and high susceptibility to oxidation. Powder metallurgy is typically the manufacturing process of choice. Recently, Wire + Arc Additive Manufacturing has proven capable to produce fully-dense large-scale metal parts at relatively low cost, by using high-quality wire as feedstock. In this study, this technique has been used for the production of large-scale tungsten linear structures. The orientation of the wire feeding has been studied and optimised to obtain defect-free tungsten deposits. In particular, front wire feeding eliminated the occurrence of pores and micro-cracks, when compared to side wire feeding. The microstructure, the occurrence of defects and their relationship with the deposition process have also been discussed. Despite the repetitive thermal cycles and the inherent brittleness of the material, the as-deposited structures were free from internal cracks and the layer dimensions were stable during the entire deposition process. This enabled the production of a relatively large-scale component, with the dimension of 210 x 75 x 12 mm. This study has demonstrated that Wire + Arc Additive Manufacture can be used to produce large-scale parts in unalloyed tungsten by complete fusion, presenting a potential alternative to the powder metallurgy manufacturing route.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
