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Abstract：
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The effect of σ phase on Superplasticity of duplex stainless steel in lower temperature has been studied. The role of σ phase in superplasticity of the steel in lower temperature has been discussed by means of (960)-850℃ reheating process. It can be shown by experiment that the proportion of σ phase in superplastic deformation of duplex stainless steel in lower temperature increased apparently. The grain boundaries sliding of σ phase occurred during superplastic deformation. The effects of σ phase on superplasticity of the steel in lower temperature are the integration of grain refinement and tension brittleness. The emergence of σ phase has little influence upon the m values.
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Reference：
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1 SoonHHong,YoungSHan.PhenomenaandMechanismonSuper plasticityofDuplexStainlessSteels.MetalsandMaterials,2000(6):161～167
2 张继祥,唐荣森.高温超塑性拉伸试验方法设计.材料工程,1996(3):41～43
3 任学平,唐荻,张海冰.变形功与冷却速度对金属组织细化的影响.金属学报,2002(3):295～298
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