21Cr节镍型双相不锈钢高温形变过程的静态软化分析

采用热模拟研究了21Cr双相不锈钢在高温变形道次间隔时间内的静态软化行为,讨论了变形温度、应变速率和变形程度对静态再结晶行为及微观组织的影响。结果表明,变形条件通过影响两相内部应变分配进一步影响双相不锈钢静态软化行为。随着变形温度和变形程度增加,铁素体相内承担的应变增加,铁素体内部再结晶程度增加,促进双相不锈钢的静态软化程度增加;而随着应变速率的增加,试验钢静态软化率的变化规律与奥氏体相承担的应变变化规律相同,都呈现出先降低后升高的变化趋势,奥氏体相在应变速率为1 s^-1时的内部再结晶程度最低。21Cr双相不锈钢静态再结晶激活能约为301 kJ/mol。

Static softening analysis of 21Cr nickel saving duplex stainless steel during high temperature deformation process

Static softening behavior of 21Cr duplex stainless steel during high temperature deformation pass interval was studied by using thermal simulation. The effects of deformation temperature, strain rate and deformation degree on static recrystallization behavior and microstructure were discussed. The results show that the deformation conditions further affect the static softening behavior of duplex stainless steel by affecting the strain distribution in the two phases. With the increase of strain temperature and deformation degree, the strain in ferrite phase increases, and the recrystallization degree in ferrite increases, which causes the increase of static softening degree of duplex stainless steel. With the increase of strain rate, the variation of static softening rate is the same as that of strain assumed by austenite phase, which shows a trend of first decreasing and then increasing. The internal recrystallization degree of austenite is the lowest when the strain rate is 1 s^-1. The activation energy of static recrystallization of the 21Cr duplex stainless steel is about 301 kJ/mol.