Abstract
Effect of R-phase at an initial stage of aging on impact toughness was investigated in this study. Microstructure observation and energy dispersive x-ray analysis obviously clarified that the R-phase was mainly precipitated at interface of ferrite and austenite phases and inside of the ferrite phase at the initial stage of aging, and it was transformed into σ-phase with an increase of aging time. The ferrite phase was decomposed into new γ2-phase and σ-phase by aging treatment. These variations of phase during the aging affected the mechanical property. In other words, the impact toughness value rapidly decreased with an increase of the R-phase at the initial stage of aging while it sharply decreased and then slowly decreased with an increase of the σ-phase. This decrease of the toughness at the initial stage of aging was predominantly due to the precipitation of R-phase.
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Hwang, T.H., Kim, J.H., Kim, K.H. et al. Effect of R-phase on impact toughness of 25Cr-7Ni-4Mo super duplex stainless steel. Met. Mater. Int. 20, 13–17 (2014). https://doi.org/10.1007/s12540-014-1004-2
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DOI: https://doi.org/10.1007/s12540-014-1004-2