压下变形参数对超高强钢再结晶规律的影响

以一种超高强钢为研究对象,对其进行了热力学计算分析和热模拟压下实验,采用金相组织和扫描形貌分析等手段,研究了压下变形参数对超高强钢再结晶的影响规律。研究结果表明:变形速率越大,变形温度越低,实验钢动态再结晶越不容易发生;变形温度为950℃,变形速率为0.1s~(-1)时,真应变为0.1,奥氏体晶粒尺寸为65.24μm;真应变为0.5时,稳态连续再结晶形成的奥氏体沿着原来奥氏体向晶内长大,尺寸较为均匀,晶粒细化到48.21μm;真应变为0.8时,发生非连续再结晶,晶粒细化到30.45μm,呈现多边形等轴状。

Effect laws of deformation parameters on recrystallization of ultra-high strength steel

In this study,an ultra-high strength steel(UHSS) as the research object,thermodynamics and thermal simulation compression experiments were carried out to study the effect laws of deformation parameters on recrystallization by using scanning means microstructure and morphology analysis.The results showed that the greater the strain rate and the lower the deformation temperature,the dynamic recrystallization was less likely to occur.When the deformation temperature was 950 ℃，the strain rate was 0.1 s-1 and the true strain was 0.1,the austenite grain size was 65.24 μm.When the true strain was 0.5,steady continuous recrystallization uniform austenite was formed along new boundaries growing into the grains body,and grain size was 48.21 μm.When the true strain was 0.8,non-continuous recrystallization was occurred on condition of the true strain of 0.8,and grain size was 30.45 μm,showing equiaxed polygon.