Hot corrosion behavior of hot isostatic pressing treated TiC/GTD222 composite fabricated by selective laser melting

Abstract

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.

Citation

Lv, Y., Liu, Y., Wang, R., Yu, H., Bi, Z., Liu, G. and Sun, G. (2024), "Hot corrosion behavior of hot isostatic pressing treated TiC/GTD222 composite fabricated by selective laser melting", Anti-Corrosion Methods and Materials, Vol. 71 No. 1, pp. 30-37. https://doi.org/10.1108/ACMM-08-2023-2870