1Cr17Ni1双相不锈钢的热变形行为及其热加工图

运用Gleeble-3800热模拟试验机研究了1Cr17Ni1马氏体-铁素体双相不锈钢在变形温度为950～1150℃、应变速率为0.1～10 s－1条件下的热压缩变形行为。运用双曲正弦函数构建了本构方程，得到了表观激活能为391.586 kJ/mol，并基于动态材料模型绘制了1Cr17Ni1钢不同应变量下的热加工图。观察变形后的组织形貌得到较低温度下发生动态回复与动态再结晶，较高温度只发生动态回复，综合热加工图与变形后组织得到最佳热变形工艺：热加工温度范围为950～1000℃、热加工变形速率范围为0.1～0.3和5～10 s－1。

Hot deformation behavior and its processing map of 1Cr17Ni1 duplex stainless steel

The hot deformation behavior of the 1Cr17Ni1 martensite- ferritic duplex stainless steel at 950-1 150 ℃with the strain rate of 0.1-10 s-1 on a Gleeble-3800 simulated machine was investigated. The constitutive equation was constructed by using hyperbolic sine function to obtain the apparent deformation activation energy which was 391.586 kJ/mol,and based on dynamic material model the hot processing map of 1Cr17Ni1 steel under different strain was made. At lower deformation temperature,the dynamic recovery and dynamic recrystallization occurred for the tis-sue morphology. At the high temperature,only the dynamic recovery occured. An optimum processing parameters of hot deformation for this steel can also be obtained by the the processing map and deformation,in which the hot working tem-perature range was 950-1 000℃,and the thermal deformation rate range was 0.1-0.3 and 5-10 s-1.