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采用热/力模拟实验方法研究了409L铁素体不锈钢(409LFSS)在950～1150℃、应变速率为0.05～2.5s-1条件下的热变形及组织变化,讨论了热变形参数对流变应力和显微组织的影响。结果表明,409L铁素体不锈钢的表观应力指数及热变形表观激活能分别为4.45、262kJ/mol;其热变形方程为ε=5.347×1011[sinh(α·σp)]4.45exp(-262000/RT);该钢的铁素体软化机制与Z参数有关,且随着Z值从2.09×108增加到3.92×1011,热变形峰值应力相应从13.73MPa增加到65.08MPa。
The thermal deformation and microstructure change of 409L ferritic stainless steel (409LFSS) at 950 ~ 1150 ℃ and strain rate of 0.05 ~ 2.5s-1 were investigated by means of the thermal-mechanical simulation experiment. The effects of thermal deformation parameters on the flow stress and Effect of microstructure. The results show that the apparent stress exponent and the apparent activation energy of hot deformation of 409L ferritic stainless steel are 4.45 and 262 kJ / mol, respectively. The thermal deformation equation of the 409L ferritic stainless steel is ε = 5.347 × 1011 [sinh (α · σp)] 4.45exp (- 262000 / RT). The ferrite softening mechanism of this steel is related to the Z parameter. With the increase of Z value from 2.09 × 108 to 3.92 × 1011, the peak stress of thermal deformation increases from 13.73 MPa to 65.08 MPa.