Abstract

The causes of the decrease in the impact toughness of a cast VKh4L-VI nickel superalloy melted using the substandard wastes of a deformable KhN50VMTYuB (EP648) nickel superalloy in the form of ingots formed by remelting chips in an open induction furnace are studied. The decrease in the impact toughness of the cast VKh4L-VI nickel superalloy is found to be caused by coarse carbides with an unfavorable morphology and their long conglomerates disposed both in the grain volume and at grain boundaries. Experiments show that, during melting of the VKh4L-VI alloy, a carbide structure is inherited from the wastes of the KhN50VMTYuB superalloy. A technology of melting the VKh4L-Vi superalloy using up to 25% substandard wastes of the KhN50VMTYuB superalloy has been developed. This technology includes high-temperature melt treatment (HTMT) to exclude the formation of a rough carbide phase in the superalloy and allows us to achieve the properties of the finished metal that meet the requirements of normative documents.

中文翻译：

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高温处理对 VKh4L-VI 合金组织和力学性能的影响

摘要

研究了使用可变形 KhN50VMTYuB (EP648) 镍高温合金的不合格废料熔炼的铸造 VKh4L-VI 镍高温合金冲击韧性降低的原因，该废料是通过在开放式感应炉中重熔切屑形成的锭形式。已发现铸造 VKh4L-VI 镍高温合金冲击韧性的降低是由具有不利形态的粗大碳化物及其位于晶粒体积和晶界处的长聚集体引起的。实验表明，在 VKh4L-VI 合金的熔化过程中，从 KhN50VMTYuB 高温合金的废料中继承了碳化物结构。已经开发出一种使用高达 25% 的 KhN50VMTYuB 高温合金不合格废料熔化 VKh4L-Vi 高温合金的技术。