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| Effect of Grain Size on Susceptibility to Intergranular Corrosion for Austenitic Stainless Steel |
| YU Shurong 1, HE Yanni1, LI Shuxin 1, WANG Lu2 |
1. School of Petrochemical Engineering，Lanzhou University of Technology, Lanzhou 730050, China;
2. Research Institute of Lanzhou Petrochemical Company, Lanzhou 730060, China |
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Abstract Intergranular corrosion susceptibility of diffusion bonded joints of 316L stainless steel was investigated by using microstructure inspection, electrochemical testing and analysis of grain boundary characteristic. Effect of grain size and microstructure texture on sensitization of the diffusion bonded joint was discussed. The result showed that no chromium carbide precipitation was observed in the diffusion bonded joint after 100 h treatment at 650 ℃, while chromium carbide precipitations could be seen clearly after 8 h treatment in the base material. The susceptibility of the diffusion bonded joint is much less than that of the base material. The intergranular corrosion susceptibility of 316LSS decreases with increasing grain size. Grain coarsening and increase in the amount of the twin boundaries lead to the improvement of the intergranular corrosion resistance, but the grain coarsening is the main contribution.
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