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

doi:10.11902/1005.4537.2025.028

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

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

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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

Cite this article:

BAI Yingxiong, WANG Yanli, LI Xiangwei, WU Zefeng, ZHANG Shuyan. 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. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1709-1716.

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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

Received: 15 January 2025 32134.14.1005.4537.2025.028

ZTFLH:

TG174

Fund: Guangdong Major Project of Basic and Applied Basic Research(2020B0301030001)

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

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	BAI Yingxiong
	WANG Yanli
	LI Xiangwei
	WU Zefeng
	ZHANG Shuyan

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.028 OR https://www.jcscp.org/EN/Y2025/V45/I6/1709

Fig.1 Microstructures of SLM GH4099 (a, b) and HT GH4099 (c, d)

Fig.2 TEM images and EDS element mappings of SLM GH4099 (a) and HT GH4099 (b)

Fig.3 Mass change curves of SLM GH4099 and HT GH4099 during hot corrosion in 75%Na₂SO₄ + 25%NaCl mixed salt deposit at 900 ^oC for 120 h

Fig.4 XRD patterns of SLM GH4099 and HT GH4099 after hot corrosion for 0 h (a), 60 h (b) and 120 h (c)

Fig.5 Surface morphologies of SLM GH4099 (a, c, e) and HT GH4099 (b, d, f) after hot corrosion at 900 ^oC for 60 h

Table 1 EDS determined compositions of the marked points in Fig.5

Fig.6 Surface morphologies of SLM GH4099 (a, c, e) and HT GH4099 (b, d, f) after hot corrosion at 900 ^oC for 120 h

Fig.7 Cross-sectional morphology (a) and EDS element mappings of Ni (b), Cr (c), Co (d), S (e), W (f), Mo (g), Al (h), O (i) and Ti (j) of SLM GH4099 after 120 h hot corrosion

Fig.8 Cross-sectional morphologies of SLM GH4099 (a) and HT GH4099 (b) after 120 h hot corrosion

Fig.9 Cross-sectional morphology (a) and EDS element mappings of Ni (b), Cr (c), Co (d), S (e), W (f), Mo (g), Al (h), O (i) and Ti (j) of HT GH4099 after 120 h hot corrosion

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