Purpose

This paper aims to design a novel TiC/GTD222 nickel-based high-temperature alloy with excellent hot corrosion resistance by incorporating appropriate amounts of C, Al and Ti elements into GTD222 alloy.

Design/methodology/approach

The composite material was prepared using the selective laser melting (SLM) technology, followed by a hot isostatic pressing (HIP) treatment. Subsequently, the composite underwent a hot corrosion test in a 75% Na₂SO₄ + 25% NaCl mixed salt environment at 900 °C.

Findings

The HIP-SLMed TiC/GTD222 composite exhibits a relatively low weight loss rate. First, the addition of alloying elements facilitates the formation of multiple protective oxide films rich in Al, Ti and Cr. These oxide films play a crucial role in enhancing the material’s resistance to hot corrosion. Second, the HIP treatment results in a reduction of grain size in the composite and an increased number of grain boundaries, which further promote the formation of protective films.

Originality/value

The hot corrosion behavior of the TiC/GTD222 nickel-based composite material prepared through SLM and HIP processing has not been previously studied. This research provides a new approach for designing nickel-based superalloys with excellent hot corrosion resistance.

中文翻译：

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选区激光熔化热等静压处理 TiC/GTD222 复合材料的热腐蚀行为

目的

本文旨在通过在GTD222合金中掺入适量的C、Al和Ti元素，设计出一种具有优异抗热腐蚀性能的新型TiC/GTD222镍基高温合金。

设计/方法论/途径

该复合材料采用选择性激光熔化（SLM）技术制备，然后进行热等静压（HIP）处理。 随后，复合材料在900 ℃的75% Na ₂ SO ₄ + 25% NaCl混合盐环境中进行热腐蚀试验。

发现

HIP-SLMed TiC/GTD222 复合材料表现出相对较低的失重率。首先，合金元素的添加有利于形成富含Al、Ti和Cr的多重保护性氧化膜。这些氧化膜对于增强材料的耐热腐蚀性能起着至关重要的作用。其次，HIP 处理导致复合材料晶粒尺寸减小，晶界数量增加，从而进一步促进保护膜的形成。

原创性/价值

此前尚未研究过通过SLM和HIP工艺制备的TiC/GTD222镍基复合材料的热腐蚀行为。该研究为设计具有优异耐热腐蚀性能的镍基高温合金提供了一种新方法。