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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of {VIM+EBCHR} Refining for IN-738 Alloy
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Effects of {VIM+EBCHR} Refining for IN-738 Alloy

机译：{VIM + EBCHR}精炼对IN-738合金的影响

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摘要

Alloy IN-738 has gained acceptance as a durable turbine blade material for the gas turbine power industry. Typically, IN-738 material is a vacuum-cast, precipitation-hardened nickel-base alloy exhibiting excellent high-temperature creep-stress rupture strengths for extended service in a harsh thermal environment. This alloy also demonstrates an outstanding hot-corrosion resistance superior to that of other high-strength superalloys containing lower chromium content. Normally, IN-738 is vacuum-melted and investment-cast where typical casting conditions are problematic. For example, melts are superheated above the lower-liquidus temperature to about 1454 °C (2650 °F) and casting molds are preheated to temperatures of 981 °C (1800 °F) or higher. For an alloy, which exhibits a melting range of (1231-1315) °C (2250-2400) °F, this abusive melt practice leads to an excessively large dendritic crystals and gross coring of the microstructure with associated defects and deleterious phases. The intent of this article is to show that modern-day refining by {VIM+EBCHR} methods can be used to create a better alloy 738 for turbine blade applications. Cross-comparisons of selected properties for both investment-cast and ingot-cast test samples are here given.
机译：IN-738合金已被接受为燃气轮机发电行业的耐用涡轮叶片材料。通常，IN-738材料是一种真空浇铸，沉淀硬化的镍基合金，具有出色的高温蠕变应力断裂强度，可以在恶劣的热环境中长期使用。该合金还表现出优异的耐热腐蚀性，优于其他铬含量较低的高强度高温合金。通常，在典型的铸造条件有问题的情况下，IN-738是真空熔融和熔模铸造的。例如，熔融金属在较低液相线温度以上过热至约1454°C（2650°F），铸模被预热至981°C（1800°F）或更高。对于熔点范围为（1231-1315）°C（2250-2400）°F的合金，这种有害的熔融行为会导致树枝状晶体过大，并导致微观结构的整体取芯，以及相关的缺陷和有害相。本文的目的是表明通过{VIM + EBCHR}方法进行的现代精炼可用于制造用于涡轮叶片应用的更好的合金738。此处给出了投资铸造和铸锭测试样品的选定性能的交叉比较。

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