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首页> 外文期刊>Journal of Materials Engineering and Performance >Weldability and microstructural variations in weldments of Ti-5Ta-1.8Nb alloy
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Weldability and microstructural variations in weldments of Ti-5Ta-1.8Nb alloy

机译：Ti-5Ta-1.8Nb合金的焊接性和显微组织变化

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摘要

The successful replacement of the present generation of corrosion-resistant materials (nitric acid-grade stainless steel and Ti) by Ti-5Ta-1.8Nb, which has better corrosion resistance, depends on its weldability characteristics. This article presents the results of a study on the fabrication, qualification, and microstructural characterization of the welds. Welding was carried out using the direct current electrode negative (DCEN) polarity tungsten inert gas (TIG) (manual) welding method with high-purity Ar shielding. Testing was carried out as per the ASME standard (section IX, welding and brazing). Qualification tests found that the weldment met the required properties. The weldment showed heterogeneous microstructures, which are rationalized based on differences in phase transformation mechanisms that are dictated by the thermal cycles experienced by various microscopic regions. The results, described in this article, confirm that the weldability of the developmental Ti-Ta-Nb alloy is excellent. A preliminary evaluation of the corrosion behavior of the welds showed rates comparable to that of the base metal, establishing that this alloy could be considered as an alternative material for use in highly corrosive environments.
机译：Ti-5Ta-1.8Nb具有更好的耐腐蚀性，能否成功地替代目前的耐腐蚀材料（硝酸级不锈钢和Ti）取决于其可焊性。本文介绍了焊缝的制造，鉴定和微结构表征的研究结果。使用直流电极负极（DCEN）极性钨极惰性气体（TIG）（手动）焊接方法，并采用高纯度Ar屏蔽进行焊接。根据ASME标准（第IX节，焊接和钎焊）进行测试。资格测试发现焊件满足要求的性能。焊件显示出异质的微观结构，这些微观结构是根据相变机制的差异而合理化的，这些差异是由各个微观区域经历的热循环决定的。本文所述的结果证实，开发的Ti-Ta-Nb合金的焊接性极好。对焊缝腐蚀行为的初步评估表明，其腐蚀速率可与贱金属相媲美，证明该合金可被视为在高腐蚀性环境中使用的替代材料。

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