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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >A review on alpha case formation and modeling of mass transfer during investment casting of titanium alloys
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A review on alpha case formation and modeling of mass transfer during investment casting of titanium alloys

机译：钛合金投资铸造中α壳体形成及大规模转移建模综述

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摘要

Titanium alloys have excellent corrosion resistance, high temperature strength, low density, and biocompatibility. Therefore, they are increasingly used for aerospace, biomedical, and chemical applications. Investment casting is a well-established process for manufacturing near-net-shape intricate parts for such applications. However, mass transfer arising from metal-mold reactions is still a major problem that drastically impairs the surface and properties of the castings. Although there have been astounding developments over the past 20 years, they remain scattered in various research papers and conference proceedings. This review summarizes the current status of the field, gaps in the scientific understanding, and the research needs for the expansion of efficient casting of titanium alloys. The uniqueness of this paper includes a comprehensive analysis of the interfacial reactions and mass transfer problems. Additionally, momentum and heat transfer are presented where applicable, to offer a holistic understanding of the transport phenomena involved in investment casting. Solutions based on modeling and experimental validation are discussed, highlighting ceramic oxide refractories like zirconia, yttria, calcia, alumina, and novel refractories namely, calcium zirconate and barium zirconate. It was found that while mold material selection is vital, alloy composition should also be carefully considered in mitigating metal-mold reactions and mass transfer. (C) 2020 Elsevier B.V. All rights reserved.
机译：钛合金具有优良的耐腐蚀性、高温强度、低密度和生物相容性。因此，它们越来越多地用于航空航天、生物医学和化学应用。熔模铸造是一种成熟的工艺，用于制造此类应用的近净形状复杂零件。然而，金属型反应引起的传质仍然是一个严重损害铸件表面和性能的主要问题。尽管在过去20年里有了惊人的发展，但它们仍然分散在各种研究论文和会议记录中。本文综述了该领域的现状、科学认识上的差距以及扩大钛合金高效铸造的研究需求。本文的独特之处在于对界面反应和传质问题进行了综合分析。此外，在适用的情况下，还介绍了动量和热传递，以全面了解熔模铸造中涉及的传输现象。讨论了基于建模和实验验证的解决方案，重点介绍了氧化锆、氧化钇、钙、氧化铝等陶瓷氧化物耐火材料，以及新型耐火材料，即锆酸钙和锆酸钡。研究发现，虽然模具材料选择至关重要，但在缓解金属-模具反应和传质时，也应仔细考虑合金成分。（C） 2020爱思唯尔B.V.版权所有。

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