Modification of M23C6 carbides by Ti addition in Ni-based polycrystalline superalloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-04-07 DOI:10.1016/j.scriptamat.2025.116686

Han Wang , Xiang Fei , Shijie Sun , Naicheng Sheng , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun

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引用次数: 0

Abstract

The M₂₃C₆ phase is usually precipitated in high-Cr content Ni-based polycrystalline superalloys, which has significant effects on properties of the alloys. In this work, the role of Ti on the modification of M₂₃C₆ carbides was investigated. In the alloys without Ti (6.6Al-0Ti alloy), MC carbides decomposed and M₂₃C₆ carbides precipitated during primary aging treatment. In contrast, alloy containing Ti (3.8Al-3Ti alloy), MC carbides remained stable throughout aging process and M₂₃C₆ carbides precipitated during secondary aging treatment. Furthermore, M₂₃C₆ carbides distributed along grain boundaries in 6.6Al-0Ti alloy were larger and more regular. According to first-principle calculations, the formation energy of MC carbide in 3.8Al-3Ti alloy was lower, which indicated MC carbide was more stable, resulting in limited carbon available for M₂₃C₆ carbides precipitation. Therefore, the introduction of Ti would inhibit precipitation of M₂₃C₆ carbides due to more stable MC carbides in superalloy containing Ti.

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ni基多晶高温合金中Ti对M23C6碳化物的改性

M23C6相在高cr含量镍基多晶高温合金中析出，对合金性能有重要影响。本文研究了Ti对M23C6碳化物的改性作用。在不含Ti的合金（6.6Al-0Ti合金）中，MC碳化物分解，M23C6碳化物析出。而含Ti的合金（3.8Al-3Ti合金），MC碳化物在时效过程中保持稳定，M23C6碳化物在二次时效过程中析出。此外，在6.6Al-0Ti合金中，沿晶界分布的M23C6碳化物更大、更规则。根据第一性原理计算，3.8Al-3Ti合金中MC碳化物的形成能较低，表明MC碳化物更稳定，导致析出M23C6碳化物的可用碳有限。因此，Ti的引入会抑制M23C6碳化物的析出，因为在含Ti的高温合金中MC碳化物更加稳定。

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

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.