title: Yield stress of duplex stainless steel specimens estimated using a compound Hall-Petch equation.
abstract: In this study, the 0.2% yield stress of duplex stainless steel was evaluated using a compound Hall-Petch equation. The compound Hall-Petch equation was derived from four types of duplex stainless steel, which contained 0.2-64.4 wt% δ-ferrite phase, had different chemical compositions and were annealed at different temperatures. Intragranular yield stress was measured with an ultra-microhardness tester and evaluated with the yield stress model proposed by Daoet al. Grain size, volume fraction and texture were monitored by electron backscattering diffraction measurement. Thekγconstant in the compound equation for duplex stainless steel agrees well with that for γ-phase SUS316L steel in the temperature range of 1323-1473 K. The derived compound Hall-Petch equation predicts that the yield stress will be in good agreement with the experimental results for the Cr, Mn, Si, Ni and N solid-solution states. We find that the intragranular yield stress of the δ-phase of duplex stainless steel is rather sensitive to the chemical composition and annealing conditions, which is attributed to the size misfit parameter.
authors.affiliation: Research and Development Headquarters, The Japan Steel Works, Ltd, Gate City Ohsaki West Tower, 11-1 Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan.
authors.forename: Noriaki
authors.initials: N
authors.lastname: Hirota
authors.affiliation: Innovative Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Fuxing
authors.initials: F
authors.lastname: Yin
authors.affiliation: Muroran Research Laboratory, The Japan Steel Works, Ltd, 4 Chatsumachi, Muroran, Hokkaido 051-8505, Japan.
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Azuma
authors.affiliation: Innovative Materials Engineering Laboratory, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: Tadanobu
authors.initials: T
authors.lastname: Inoue
keywords: 0.2% yield stress; compound Hall–Petch equation; duplex stainless steel; electron backscattering diffraction; grain size; intragranular yield stress; size misfit parameter; solid solution; ultra-microhardness tester; volume fraction