双相不锈钢2205热变形行为的实验

Laboratory study on hot deformation behavior of 2205 duplex stainless steel

利用扫描电镜的EBSD技术,通过对单道次压缩热模拟实验后淬火试样组织的深入系统分析,研究了2205双相不锈钢热变形过程中的软化行为。研究结果表明,2205双相不锈钢的主要软化机制为铁素体的连续动态再结晶和奥氏体与铁素体之间的相转变,变形速率为主要影响参数,并通过影响应变在两相之间的分配控制组织在变形过程中的软化进程。变形速率很小时,铁素体的动态再结晶和铁素体向奥氏体的相转变是互为竞争的两个软化机制;随着变形速率的增加,主导软化机制转变为铁素体的动态再结晶和奥氏体相向铁素体相的转变。

The softening behavior of 2205 duplex stainless steel during the hot deformation was studied through deeply and systematically analyzing the microstructure of specimens quenched after single pass compressing thermal simulation experiment by using the scanning electron microscope＇s EBSD.The results showed that the main softening mechanisms were continuous dynamic recrystallization of ferrite and phase transformation between austenite and ferrite,and the strain rate was the key influencing parameter which controlled the softening process through influencing the partition of stain between austenite and ferrite.When the strain rate was very small,the continuous dynamic recrystallization of ferrite and the phase transformation from ferrite to austenite were two competitive softening mechanisms.But with the increase of strain rate,the continuous dynamic recrystallization of ferrite and the phase transformation from austenite to ferrite became the dominant role gradually.