Effect of Low Temperature Diffusion Pretreatment on Precipitation of Phases During Post-aging Treatment for B-containing S31254 Super Austenitic Stainless Steel and its Corrosion Resistance

doi:10.11902/1005.4537.2025.073

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1773-1778 DOI: 10.11902/1005.4537.2025.073

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Effect of Low Temperature Diffusion Pretreatment on Precipitation of Phases During Post-aging Treatment for B-containing S31254 Super Austenitic Stainless Steel and its Corrosion Resistance

HE Yan¹^,²(

), LIU Yan¹^,², TIAN Hua¹^,², CHEN Ye¹^,²

1 China Academy of Machinery Shanxi Electromechanical Research Institute Co. Ltd. , Taiyuan 030009, China
2 Shanxi Machinery Products Quality Supervision and Inspection Station Co. Ltd. , Taiyuan 030009, China

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HE Yan, LIU Yan, TIAN Hua, CHEN Ye. Effect of Low Temperature Diffusion Pretreatment on Precipitation of Phases During Post-aging Treatment for B-containing S31254 Super Austenitic Stainless Steel and its Corrosion Resistance. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1773-1778.

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Abstract

In this paper, hot rolled plate of a B-containing super austenitic stainless steel S31254 was subjected to solid solution treatment at 1180 ^oC for 20 min, and then diffusion pre-treatment at 300 ^oC for different times, and finally aging 900 ^oC for 2 h. Meanwhile the influence on the precipitation of second phases during aging process and the corrosion performance in 10% NaCl solution of the aged steel was assessed. The results show that when the steel is subjected to pre-diffusion treatment at 300 ^oC for different times, it will affect the redistribution of B at grain boundaries after subsequent high-temperature aging treatment. The longer the low temperature diffusion time, the more significant the impact on the formation and distribution of the precipitation phase. Among others, the steel being pre-diffusion treated at 300 ^oC for 60 min may present the most significant inhibition effect on the precipitation of second phases. B is involved in the precipitation of the precipitated phase at grain boundaries, the B-containing Mo-rich precipitate phase interface has better corrosion resistance. After diffusion treatment at 300 ^oC for different times, the precipitates of were significantly reduced in the aging microstructure of S31254 steel.

Key words: super austenitic stainless steel precipitate phase aging treatment corrosion resistance diffusion pretreatment

Received: 28 February 2025 32134.14.1005.4537.2025.073

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	HE Yan
	LIU Yan
	TIAN Hua
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https://www.jcscp.org/EN/10.11902/1005.4537.2025.073 OR https://www.jcscp.org/EN/Y2025/V45/I6/1773

Fig.1 Heat treatment process flow

Fig.2 Microstructures of S31254 steel after isothermal treatment at 300 ^oC for 0 min (a), 20 min (b), 40 min (c), 60 min (d) and then aging at 900 ^oC for 2 h

Fig.3 EDS composition analysis of S31254 steel after firstly isothermal treatment at 300 ^oC for 0 min (a), 40 min (b), 60 min (c) and then aging at 900 ^oC for 2 h

Fig.4 Solubility curve of B in austenitic steel

Fig.5 Potentiodynamic polarization curves of S31254 steel after firstly isothermal treatment at 300 ^oC for different time and then aging at 900 ^oC for 2 h in 10%NaCl solution

Fig.6 Potentiodynamic reactivation curves of S31254 steel with isothermal treatment at 300 ^oC for different time and then aging at 900 ^oC for 2 h in 10%NaCl solution

Table 1 Fitting I_r and R_a values of potentiodynamic reactivation curves of S31254 steel in Fig.6

Fig.7 Surface corrosion morphologies of S31254 steel with isothermal treatment at 300 ^oC for 0 min (a), 20 min (b), 40 min (c), 60 min (d) and then aging at 900 ^oC for 2 h after electrochemical polarization

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