Further investigations into alloy induced acidic fluxing

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials at High Temperatures Pub Date : 2023-06-04 DOI:10.1080/09603409.2023.2219877

A. Potter, J. Sumner, N. Simms

引用次数: 0

Abstract

ABSTRACT Gas turbine materials often feature precipitates containing refractory metals to enhance their mechanical strength. This can make them susceptible to alloy-induced acidic fluxing whereby refractory elements increase the acidity of salt deposits. It is not clear to what degree degradation around alloy precipitates is caused by alloy-induced hot corrosion mechanisms, or the inability to develop a protective scale where precipitates are located. The effect of alloy-induced hot corrosion was isolated from the disruption of the protective-scale formation by adding particles of molybdenum to the 80/20 (Na/K)2SO4 deposit for a ‘deposit re-coat’ style hot corrosion test. The resulting morphologies were compared to samples exposed without the addition of molybdenum. Morphology changes were investigated using scanning electron microscopy with energy-dispersive X-ray mapping. Results show a mix of sulphidation and pitting. The effects of molybdenum additions appear more severe for MarM 509 compared to PWA 1483.

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合金诱导酸性熔炼的进一步研究

燃气轮机材料通常具有含有难熔金属的沉淀物，以提高其机械强度。这可以使它们容易受到合金引起的酸性熔剂的影响，因此耐火材料元素增加了盐沉积物的酸度。目前尚不清楚合金析出相周围的降解在多大程度上是由合金诱导的热腐蚀机制引起的，或者无法在析出相所在的地方形成保护层。通过在80/20 (Na/K)2SO4镀层中加入钼颗粒，进行“镀层重涂”式热腐蚀试验，将合金诱导热腐蚀的影响与保护垢层的破坏隔离。将所得的形貌与未添加钼的样品进行比较。利用扫描电子显微镜和能量色散x射线成像技术研究其形态学变化。结果表明硫化和麻点混合。与PWA 1483相比，添加钼对MarM 509的影响更为严重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.