放电等离子烧结超细晶ODS镍基合金的高温氧化行为研究

doi:10.11902/1005.4537.2021.237

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 709-716 DOI: 10.11902/1005.4537.2021.237

研究报告

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放电等离子烧结超细晶ODS镍基合金的高温氧化行为研究

解磊鹏, 陈明辉(

), 王金龙, 王福会

东北大学沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819

High Temperature Oxidation Behavior of Ultrafine Grained ODS Nickel-based Superalloy Prepared by Spark Plasma Sintering

XIE Leipeng, CHEN Minghui(

), WANG Jinlong, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

全文: PDF(4483 KB) HTML

摘要:

通过机械合金化 (MA) 和放电等离子烧结 (SPS) 制备了Cr₂O₃颗粒强化的超细晶结构镍基高温合金 (ODS合金)。对比研究了不添加氧化物颗粒合金 (Base合金) 和ODS合金样品的微观结构和高温氧化行为。结果表明,在1200 ℃烧结过程中,Cr₂O₃完全转变为Al₂O₃。由于SPS快速烧结及弥散分布的原位Al₂O₃颗粒钉扎,抑制了晶粒长大,ODS合金具有十分细小的晶粒结构,其平均晶粒尺寸为0.98 μm；Base合金平均晶粒尺寸稍大,为1.54 μm。ODS合金在900 ℃下具有较好的抗氧化性能和较低的氧化速率,得益于其表面迅速生成了连续致密的内层α-Al₂O₃膜,能有效地阻止Ti和Cr向外扩散,表面生成少量保护性较差的TiO₂和NiCr₂O₄。而Base合金表面则生成了以Al₂O₃为内层,TiO₂和Cr₂O₃为中间层以及NiCr₂O₄为外层的多层结构氧化膜,并且其在初期的氧化速率较快,为1.66×10^-7 mg²·cm^-4·s^-1,是ODS合金的2倍多。

关键词 ：高温合金, 氧化物弥散强化, 细晶结构, 高温氧化, 放电等离子烧结

Abstract：

Two ultrafine-grained Ni-based superalloys with or without the addition of micron Cr₂O₃ particles are prepared by mechanical alloying (MA) and spark plasma sintering (SPS). The microstructure and high temperature oxidation behavior of these two alloys are investigated. Results indicate that the Cr₂O₃ particles are completely transformed into Al₂O₃ after sintering at 1200 ℃. Owing to the high speed of sintering by SPS and the pinning effect of oxide dispersoids, the grain growth of the alloy was effectively inhibited during sintering, which makes the ODS alloy exhibits ultrafine grain structure with an average grain size of 0.98 μm, while the same alloy without addition of Cr₂O₃ particles (denoted as blank contrast alloy) has a larger average grain size of 1.54 μm. The ODS alloy has better oxidation resistance with lower oxidation rate at 900 ℃. A continuous and dense layer of α-Al₂O₃ scale has immediately formed on the surface of ODS alloy, thus effectively prevents the outward diffusion of Ti and Cr and the formation of less protective TiO₂ and NiCr₂O₄. For the blank contrast alloy, a multilayered scale with Al₂O₃ as the inner layer, TiO₂ and Cr₂O₃ as the middle layer and NiCr₂O₄ as the outer layer could formed on the surface, and its oxidation rate is 1.66×10^-7 mg²·cm^-4·s^-1 in the initial stage, which is more than twice as much as that of the ODS alloy.

Key words： superalloy oxide dispersion strengthening fine grain structure high temperature oxidation spark plasma sintering

收稿日期: 2021-09-10

ZTFLH:

TG142.14

基金资助:国家自然科学基金(51871051);国家工业和信息技术部项目(MJ-2017-J-99)

通讯作者: 陈明辉 E-mail: mhchen@mail.neu.edu.cn

Corresponding author: CHEN Minghui E-mail: mhchen@mail.neu.edu.cn

作者简介: 解磊鹏,男,1990年生,博士生

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引用本文:

解磊鹏, 陈明辉, 王金龙, 王福会. 放电等离子烧结超细晶ODS镍基合金的高温氧化行为研究[J]. 中国腐蚀与防护学报, 2022, 42(5): 709-716.
Leipeng XIE, Minghui CHEN, Jinlong WANG, Fuhui WANG. High Temperature Oxidation Behavior of Ultrafine Grained ODS Nickel-based Superalloy Prepared by Spark Plasma Sintering. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 709-716.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.237 或 https://www.jcscp.org/CN/Y2022/V42/I5/709

表1 FGH4097合金粉末的化学成分

图1 两种烧结态合金的XRD图谱

图2 两种烧结态合金的微观结构及特征

图3 ODS合金的TEM元素面扫结果

图4 两种合金在900 ℃下氧化100 h的动力学曲线

图5 两种样品在900 ℃下氧化100 h后的XRD图谱

图6 两种合金在900 ℃下氧化100 h后表面形貌及EDS分析

图7 两种合金样品在900 ℃氧化100 h后的截面微观形貌

图8 两种合金样品在900 ℃氧化20 h后的表面微观形貌

图9 两种合金样品在900 ℃氧化20 h后的截面形貌

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