Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel

doi:10.11902/1005.4537.2015.099

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (1): 25-30 DOI: 10.11902/1005.4537.2015.099

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Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel

Xinyuan PENG^1,²(

),Xianliang ZHOU^1,²,Xiaozhen HUA²

1. School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China

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Abstract

The effect of grain size on the susceptibility to intergranular corrosion of 316LN stainless steel was investigated by means of electrochemical potentiokinetic reactivation test and electronic work function measurement, as well as microstructure characterization. Steel samples of various grain sizes were produced by heat treating the steel at 1100 ℃ for different duration. The result showed that the degree of sensitization decreases with increasing grain size; corrosion pits occur at grain boundaries and thereby form a network-like pits-chain for samples of fine grains. In the contrast, no obvious corrosion occurred on samples of coarse grain. The results of electronic work function measurement imply that the surface electronic density of states and charge density distributions for steel of coarse grains are much stable than that of fine grains.

Key words: electrochemical potentiokinetic reactivation grain size intergranular corrosion

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Xinyuan PENG,Xianliang ZHOU,Xiaozhen HUA. Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 25-30.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.099 OR https://www.jcscp.org/EN/Y2016/V36/I1/25

Fig.1 Microstructures of samples treated at 1100 ℃ for 10 min (a), 60 min (b), 240 min (c) and 600 min (d)

Table 1 Grain size of samples treated at 1100 ℃ for different time

Fig.2 Microstructures of samples with various grain sizes after sensitized: (a) 22 μm; (b) 42 μm; (c) 96 μm; (d) 193 μm

Fig.3 SEM images and EDS results of sample with the grain size of 96 μm after sensitized: (a) grain boundary morphology; (b) magnified image of circle area in Fig.3a; (c) EDS result of matrix; (d) EDS result of precipitates

Table 2 Intergranular corrosion susceptibility of samples with various grain sizes

Fig.4 DLEPR curves of 316LN stainless steel with various grain sizes

Fig.5 Surface topographies of 316LN stainless steel with various grain sizes after DLEPR: (a) 22 μm; (b) 96 μm

Fig.6 EWF with various grain sizes of 316LN stainless steel: (a) 22 μm; (b) 96 μm

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