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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (6): 1610-1616    DOI: 10.11902/1005.4537.2024.043
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Effect of B and Ce Micro-alloying on Secondary Phase Precipitation and Corrosion Resistance of S31254 Super Austenitic Stainless Steel
MA Jinyao1,2, DONG Nan1, GUO Zhensen1, HAN Peide1()
1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2. Instrumental Analysis Center of Taiyuan University of Technology, Taiyuan 030024, China
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MA Jinyao, DONG Nan, GUO Zhensen, HAN Peide. Effect of B and Ce Micro-alloying on Secondary Phase Precipitation and Corrosion Resistance of S31254 Super Austenitic Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1610-1616.

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Abstract  

The effect of B and Ce micro-alloying on secondary phase precipitation and corrosion resistance of S31254 super austenitic stainless steel were studied by OM, SEM, EDS and electrochemical tests. The results show that the addition of B and Ce can inhibit the precipitation of secondary phase in the aging process and change the morphology of precipitated phase along the grain boundary. The B and Ce micro-alloying can also improve the free-corrosion potential and pitting potential of the S31254 super austenitic stainless steel, promote the rapid formation of passive film, improve its stability synchronously, thus improve the pitting and intergranular corrosion resistance of the steel. Therefore, it follows that the synergistic effect of both B and Ce co-alloying on precipitation inhibition and corrosion resistance of S31254 is significantly more pronounced when compared to the addition of a single B element.
Key words:  S31254 super austenitic stainless steel      B      Ce micro-alloying      precipitated phase      corrosion resistance     
Received:  02 February 2024      32134.14.1005.4537.2024.043
ZTFLH:  TG174  
Corresponding Authors:  HAN Peide, E-mail: hanpeide@tyut.edu.cn
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MA Jinyao
DONG Nan
GUO Zhensen
HAN Peide

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.043     OR     https://www.jcscp.org/EN/Y2024/V44/I6/1610

SampleCSiMnPSCrNiMoCuNBCe
0B0.0120.640.470.0350.00619.1818.116.170.710.2000
50B0.0120.610.490.0170.00518.5918.116.120.580.200.0050
50B-20Ce0.0180.171.820.0070.00219.8418.076.210.560.1990.0050.002
50B-50Ce0.0150.171.870.0080.00220.0817.946.020.480.1870.0050.005
Table 1  Chemical compositions of S31254 super austenitic stainless steel samples added with B and Ce
Fig.1  Schematic illustration of the heat treatment schedule employed in this study
Fig.2  Microstructures of four S31254 stainless steels after solution treatment at 1220oC for 2 h: (a) 0B, (b) 50B, (c) 50B-20Ce, (d) 50B-50Ce
Fig.3  Microstructures of four S31254 stainless steels after aging at 950oC for 90 min: (a1, a2) 0B, (b1, b2) 50B, (c1, c2) 50B-20Ce, (d1, d2) 50B-50Ce
Fig.4  EDS elemental mappings of four S31254 stainless steels aged at 950oC for 90 min: (a) 0B, (b) 50B, (c) 50B-20Ce, (d) 50B-50Ce
PositionFeCrMoNi
0B-1(Fig.4a-1)39.226.722.38.1
0B-2(Fig.4a-2)44.525.621.88.1
50B-1(Fig.4b-1)38.722.924.69.9
50B-2(Fig.4b-2)39.822.822.710.8
50B-20Ce-1(Fig.4c-1)39.626.117.89.1
50B-20Ce-2(Fig.4c-2)40.225.716.69.4
50B-50Ce-1(Fig.4d-1)42.520.615.39.7
50B-20Ce-2(Fig.4d-2)42.420.215.710.6
Table 2  Elemental compositions of precipitates at different positions of four S31254 stainless steels
Fig.5  Potentiodynamic polarization curves (a) and EIS (b) of four S31254 stainless steels after aging at 950oC for 30 min
SampleEcorr / VIcorr / A·cm-2Epit / V
0B-0.30767.4063 × 10-70.9791
50B-0.28065.6066 × 10-71.0264
50B-20Ce-0.23764.3216 × 10-71.0284
50B-50Ce-0.15061.0656 × 10-71.0319
Table 3  Fitting electrochemical parameters of polarization curves of four S31254 stainless steels after aging at 950oC for 30 min
Fig.6  Morphologies of four S31254 stainless steels after solid solution (a1-d1) and soaking in boiling sulfuric acid-ferric sulfate solution for 24 h (a2-d2)：(a1, a2) 0B, (b1, b2) 50B, (c1, c2) 50B-20Ce, (d1, d2) 50B-50Ce
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