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| Influence of cold rolling on precipitation of S32750 super duplex stainless steel |
| GAO Xiangming1，PEI Mingde1，2，LI Guoping1，2 |
(1. Taiyuan Iron and Steel (Group) Co.， Ltd.， Taiyuan 030003， Shanxi， China；
2. State Key Laboratory of Advanced Stainless Steel Materials， Taiyuan 030003， Shanxi， China) |
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Abstract To optimize heating process and avoid precipitating harmful phase within cold plates，the effect of cold hardening on precipitation of S32750 plate was studied. Super duplex stainless steel S32750 plates were heated at 850 ℃ after different cold deformation. The precipitations were studied by SEM，EDS，XRD and TEM. The result shows that the amounts of precipitation increases with the cold deformation increasing，when the cold deformation rate bigger than 50%，the ferrite phase almost filled with precipitation. The precipitations almost are sigma phase，except for small amount Cr2N，χ phase and γ2. σ and χ phase were precipitated at the phase boundary and ferrite phase，Cr2N is precipitated at the phase boundary and secondary austenite in the ferrite with the Sigma phase. The dislocation density increases with the cold deformation increasing，which lead to the precipitation speeding up.
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