Change in Structure by Heat Treatment of SUS316L HS-PM Process Material.

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  • ＳＵＳ３１６Ｌ高ひずみ付加ＰＭプロセス材の熱処理による組織変化
  • SUS316L タカヒズミ フカ PM プロセスザイ ノ ネツ ショリ ニ ヨル ソシキ ヘンカ

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The high strain powder metallurgy (HS-PM) process was applied to an SUS316L gas atomized powder by 360ks mechanical milling (MM) with a planetary ball mill under an Ar atmosphere. The MM powder was annealed at 1073 K, 1173 K, 1273 K. Each structure was investigated using XRD and TEM/EDS. It was confirmed that as-MM powder consisted of an ultra fine (α+γ) microduplex structure. It was supposed that the a phase was formed as the HS-PM process by increasing free energy of the austenitic phase. Fine grain structure with its grain size of 2.3μm composed of fine carbides and γ phase was obtained when MM powder was annealed at 1073 K for 3.6 ks. It was also confirmed that these fine carbides restrain the grain growth. But at 1173 K and 1273 K, the fine carbides were not seen, so that grain size increased drastically.

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