Microstructural changes during heating of super duplex stainless steel and its thermal deformation behavior |
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Affiliation: | Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China |
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Abstract: | Microstructural changes during heating of highly alloyed Cr26Ni7 type super duplex stainless steel (SDSS2607) and its thermal deformation behavior were investigated.At different heating rates,the mechanism of phase transition from γ phase to δ phase and growth modes of δ phase differed.Variations in microstructures for ascast SDSS2607 during heat preservation at 1 220 ℃ indicated two kinds of transformations from γ phase to δ phase.In-situ observations of microstructural changes during the tensile process at 1 050 ℃ showed a mutual coordination between γ and δ phases.When the true strain increased,the mutual coordination between γ and δ phases was damaged.Subsequently,cracks nucleated at the γ/δ interface.With the increase in temperature,the strength of ascast SDSS2607 decreased while its plasticity increased.Its thermoplasticity was poor,and the reduction in area of tensile specimens was less than 80%.When the deformation strain of hot compression increased,the stable deformation zone in the heat processing maps enlarged gradually.Moreover,the unstable deformation zones were extended. |
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Keywords: | super duplex stainless steel microstructural changes thermal deformation behavior |
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