CAJ | 학술논문

利用M M S‐300热／力模拟实验机，在变形温度850℃～1150℃、应变量0～0.8和应变速率0.01 s－1～10s－1条件下对20CrNi2Mo钢进行高温单道次压缩实验，分析变形温度、变形速率和变形程度对变形抗力的影响。结果表明，变形温度和变形速率对20CrNi2Mo钢变形抗力的影响最为强烈：20CrNi2Mo钢变形抗力随变形温度的升高而减小，随变形速率的提高而增大；且变形温度、变形速率和应变量3个因素之间相互作用，共同影响变形抗力。利用多元非线性回归建立了20CrNi2Mo钢高温变形抗力数学模型，与实测值比较表明，模型拟合程度较好。
이용M M S‐300열／력모의실험궤，재변형온도850℃～1150℃、응변량0～0.8화응변속솔0.01 s－1～10s－1조건하대20CrNi2Mo강진행고온단도차압축실험，분석변형온도、변형속솔화변형정도대변형항력적영향。결과표명，변형온도화변형속솔대20CrNi2Mo강변형항력적영향최위강렬：20CrNi2Mo강변형항력수변형온도적승고이감소，수변형속솔적제고이증대；차변형온도、변형속솔화응변량3개인소지간상호작용，공동영향변형항력。이용다원비선성회귀건립료20CrNi2Mo강고온변형항력수학모형，여실측치비교표명，모형의합정도교호。
Using the MMS‐300 thermal mechanical simulator ,the deformation resistance of 20CrNi2Mo steel with strain 0~0.8 and strain rate 0.01s-1 ~10s-1 at 850℃ ~1 150℃ in single pass axial compression process is tested and studied ,and the relation‐ship among deformation temperature ,strain rate ,degree of deformation and deformation resistance has been determined .The re‐sults show that the deformation resistance is affected remarkably by both strain rate and deformation temperature ,the deformation resistance decreases with the increase of temperature ,and it increases with the increase of strain rate .In addition ,the interaction of deformation temperature ,strain rate and degree of deformation affects the deformation resistance together .Through multiple non-linear regression analysis ,the deformation resistance model for the 20CrNi2Mo steel is established ,and this model proved to have good curve fitting characteristics and relatively high precision .