Corrosion Behavior of GH4169 Alloy Under Flexural Tensile Stress and Beneath a NaCl Deposit Film in Water Vapor Containing Air at 600oC

doi:10.11902/1005.4537.2024.002

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1399-1411 DOI: 10.11902/1005.4537.2024.002

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Corrosion Behavior of GH4169 Alloy Under Flexural Tensile Stress and Beneath a NaCl Deposit Film in Water Vapor Containing Air at 600^oC

WANG Wenquan¹, CUI Yu²(

), XUE Yunpeng³, LIU Li¹, WANG Fuhui¹

1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2. Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. AECC Shenyang Liming Aero-engine Co., Ltd., Shenyang 110862, China

Cite this article:

WANG Wenquan, CUI Yu, XUE Yunpeng, LIU Li, WANG Fuhui. Corrosion Behavior of GH4169 Alloy Under Flexural Tensile Stress and Beneath a NaCl Deposit Film in Water Vapor Containing Air at 600^oC. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1399-1411.

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Abstract

Corrosion behavior of high temperature alloy GH4169 under tensile stress while beneath a solid NaCl deposit film was studied in water vapor containing air at 600°C to simulate the service conditions of aircraft engine compressors in the marine environment. The results show that the applied tensile stress accelerates the corrosion of GH4169 in the environment, resulting in the formation of a complex mixture of NiCr₂O₄, NaNbO₃, Fe₂O₃, NiO, Cr₂O₃, Al₂O₃ and NiFe₂O₄ on the alloy surface. The applied tensile stress could induce active internal corrosion of GH4169. The internal corrosion products were discontinuous granular Cr₂O₃ and a small amount of Fe₂O₃ and NbO. After normal heat treatment the GH4169 alloy tends to have non-uniform intergranular corrosion, while the solid-solution heat-treated ones exhibited a relatively uniform internal corrosion zone. The active corrosion process leads to the formation of Cr and Fe depletion regions in the matrix, and the Cr and Fe vacancies in this region lead to the deteriorated stability of Ni-Cr-Fe cells.

Key words: GH4169 NaCl internal corrosion elastic stress

Received: 02 January 2024 32134.14.1005.4537.2024.002

ZTFLH:

TG174

Fund: Joint Funds of National Natural Science Foundation of China (Key)(U22A20111)

Corresponding Authors: CUI Yu, E-mail: ycui@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.002 OR https://www.jcscp.org/EN/Y2024/V44/I6/1399

Fig.1 Metallographic structure of GH4169 alloys treated by standard heat treatment (a) and solution heat treatment (b), and grain size statistics (c)

Fig.2 Experimental device diagram: (a) schematic diagram of the simulation device for medium temperature and humid environment^[4], (b) schematic diagram of a four-point bending fixture, (c) four-point bending fixture diagram

Fig.3 Stress and strain state calculated by ANSYS simulation: (a) front view of strain state, (b) oblique view of stress state, (c) top view of strain state, (d) oblique view of stress state

Fig.4 Macro surface morphologies of GH4169 alloys treated by standard heat treatment (a-c) and solution heat treatment (d-f), and deposited with NaCl after corrosion in a humid 600^oC environment for 20 h under a stress load of 0 MPa (a, d), 600 MPa (b, e) and 800 MPa (c, f)

Fig.5 Surface morphologies of GH4169 alloy treated by standard heat treatment after corrosion in a humid 600^oC environment containing solid NaCl for 20 h under a stress load of 0 MPa (a-c), 600 MPa (d-f) and 800 MPa (g-i)

Fig. 6 Surface morphologies of GH4169 alloy treated by solution heat treatment after corrosion in a humid 600^oC environment containing solid NaCl for 20 h under a stress load of 0 MPa (a-c), 600 MPa (d-f) and 800 MPa (g-i)

Fig.7 XRD patterns of surface corrosion products of NaCl-deposited GH4169 alloys treated by standard heat treatment (a) and solution heat treatment (b) after corrosion in a humid 600^oC environment for 20 h under different stress loads

Fig.8 Cross-sectional morphologies of NaCl-deposited GH4169 alloys treated by standard heat treatment (a-c) and solution heat treatment (d-f) after corrosion in a humid 600^oC environment for 20 h under a stress load of 0 MPa (a, d), 600 MPa (b, e) and 800 MPa (c, f)

Fig.9 Internal corrosion morphologies of standard heat-treated GH4169 alloy under a stress load of 0 MPa (a, d), 600 MPa (b, e) and 800 MPa (c, f) after shock polishing: (a-c) backscattered electron image of the internal corrosion morphologies, (d-f) internal corrosion morphologies with high contrast

Fig.10 Cross-sectional morphologies (a, d) and corresponding elemental distribution on the cross-section (b, e) and internal corrosion region (c, f) of GH4169 alloys treated by standard heat treatment (a-c) and solution heat treatment (d-f) after corrosion in a humid 600 °C environment for 20 h under a stress load of 600 MPa

Fig.11 Phase-stability diagram for metal elements-Cl-O at 600^oC calculated using HSC Chemistry 5^[23]

Fig.12 Ni-Cr-Fe model alloy cells and that with vacancy contained established based on GH4169 alloying element content: (a) original Ni-Cr-Fe cell, (b) a cell containing one Cr vacancy, (c) a cell containing one Fe vacancy, (d) a cell containing two Cr vacancies, (e) a cell containing three Cr vacancies, (f) a cell containing one Cr vacancy and one Fe vacancy

Fig.13 Stability of Ni-Cr-Fe model alloy cells and that with Cr and Fe vacancies: (a) system energy, (b) vacancy formation energy

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