热处理对激光选区熔化GH4099镍基高温合金900 ℃下(75%Na2SO4 + 25%NaCl)热腐蚀行为的影响

doi:10.11902/1005.4537.2025.028

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1709-1716 CSTR: 32134.14.1005.4537.2025.028 DOI: 10.11902/1005.4537.2025.028

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热处理对激光选区熔化GH4099镍基高温合金900 ℃下(75%Na₂SO₄ + 25%NaCl)热腐蚀行为的影响

白英雄¹, 王艳丽¹(

), 李相伟², 吴泽峰², 张书彦²

1 广西大学化学化工学院南宁 530004
2 东莞材料基因高等理工研究院东莞 523808

Effect of Heat Treatment on Hot Corrosion Behavior of Selective Laser Melted GH4099 Nickel-based Superalloy Beneath (75%Na₂SO₄ + 25%NaCl) Deposits in Air at 900 ^oC

BAI Yingxiong¹, WANG Yanli¹(

), LI Xiangwei², WU Zefeng², ZHANG Shuyan²

1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
2 Centre of Excellence for Advanced Materials, Dongguan 523808, China

引用本文:

白英雄, 王艳丽, 李相伟, 吴泽峰, 张书彦. 热处理对激光选区熔化GH4099镍基高温合金900 ℃下(75%Na₂SO₄ + 25%NaCl)热腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2025, 45(6): 1709-1716.
Yingxiong BAI, Yanli WANG, Xiangwei LI, Zefeng WU, Shuyan ZHANG. Effect of Heat Treatment on Hot Corrosion Behavior of Selective Laser Melted GH4099 Nickel-based Superalloy Beneath (75%Na₂SO₄ + 25%NaCl) Deposits in Air at 900 ^oC[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1709-1716.

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摘要:

聚焦激光选区熔化(SLM)制造的GH4099合金，探讨其在900 ℃下75%Na₂SO₄ + 25%NaCl混合盐中的热腐蚀行为。采用真空感应气雾化制备的粉末，经特定SLM工艺成型，并对部分试样热处理。通过金相显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)和能谱仪(EDS)等手段分析热处理前后试样的微观组织、腐蚀动力学及产物。结果表明SLM试样合金有微米级的胞状亚晶与MC碳化物，热处理后晶粒长大且析出新相。腐蚀动力学表明SLM试样初期失重快，后期SLM试样和经过热处理试样(HT)均腐蚀明显。腐蚀产物分4层，热腐蚀机理为酸性溶解腐蚀机理，热处理试样因M₂₃C₆和γ′相而具备更好耐热腐蚀性能。

关键词 ：激光选区熔化, 热处理, 镍基高温合金, 热腐蚀

Abstract：

Bulk GH4099 alloy was fabricated through a specific SLM process, then subjected to appropriate heat treatment. The hot corrosion behavior of the prepared bulk GH4099 alloys with and without heat treatment was comparatively assessed beneath a thin deposits of 75%Na₂SO₄ + 25%NaCl in air at 900 ^oC by means of electronic analytical balance, optical microscopy (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS) etc. The results reveal that the micron-sized cellular sub-grains and MC carbides are detected in the SLM alloy. After heat treatment, the grains grow and new phases precipitate. The corrosion kinetics analysis indicates that the bare and heat treated SLM alloys experience more or less the same weight loss in the initial stage, and in the later stage, the two SLM alloys all show obvious corrosion. The corrosion products are divided into four layers, and the hot corrosion process follows an acid dissolution mechanism. The heat-treated alloy has better hot corrosion resistance due to the formation of M₂₃C₆ and γ′ phases.

Key words： selective laser melting heat treatment nickel-based superalloy hot corrosion

收稿日期: 2025-01-15 32134.14.1005.4537.2025.028

ZTFLH:

TG174

基金资助:广东省基础与应用基础研究重大项目(2020B0301030001)

通讯作者: 王艳丽，E-mail：wyl187358@gxu.edu.cn，研究方向为金属材料的腐蚀与防护

Corresponding author: WANG Yanli, E-mail: wyl187358@gxu.edu.cn

作者简介: 白英雄，男，1999年生，硕士生

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图1 SLM GH4099和HT GH4099的显微组织

图2 SLM GH4099和HT GH4099的TEM像和EDS分析结果

图3 SLM GH4099和HT GH4099在900 ℃下75% Na2SO4 + 25%NaCl混合盐膜中热腐蚀120 h的质量变化曲线

图4 SLM GH4099和HT GH4099热腐蚀不同时间后的表面XRD图谱

图5 SLM GH4099和HT GH4099在900 ℃热腐蚀60 h后的表面形貌

表1 图5中标记点处EDS成分分析结果 (mass fraction / %)

图6 SLM GH4099和HT GH4099在900 ℃热腐蚀120 h后的表面形貌

图7 SLM GH4099经120 h热腐蚀后的截面形貌及EDS元素面分布

图8 SLM GH4099和HT GH4099试样热腐蚀120 h后的截面形貌

图9 HT GH4099经120 h热腐蚀后的截面形貌及EDS元素面分布

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