Annealing-induced Grain Refinement in a Nanostructured Ferritic Steel |
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Authors: | Limin Wang Zhenbo Wang Sheng Guo Ke Lu |
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Affiliation: | Limin Wang, Zhenbo Wang, Sheng Guo and Ke Lu Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China |
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Abstract: | A nanostructured surface layer with a mean ferrite grain size of ~8 nm was produced on a Fe-9Cr steel by means of surface mechanical attrition treatment. Upon annealing, ferrite grains coarsen with increasing temperature and their sizes increase to ~40 nm at 973 K. Further increasing annealing temperature leads to an obvious reduction of ferrite grain sizes, to ~14 nm at 1173 K. The annealing-induced grain refinement is analyzed in terms of phase transformations in the nanostructured steel. |
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Keywords: | Nanostructured Surface mechanical attrition treatment (SMAT) Ferritic steel Grain refinement Austenitization |
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