中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2014年
9期
2250-2256
,共7页
2219铝合金%蠕变%稳态蠕变速率%本构方程
2219鋁閤金%蠕變%穩態蠕變速率%本構方程
2219려합금%연변%은태연변속솔%본구방정
2219 aluminum alloy%creep%steady creep strain rate%constitutive equation
在时效温度为438~458 K、实验应力为120~180 MPa的条件下,采用RWS-50型电子蠕变机对2219铝合金蠕变时效行为进行研究。采用包含双曲正弦函数的方程,通过对实验数据的线性回归分析,确定应力指数、蠕变激活能及相关常数,建立2219铝合金稳态蠕变速率与实验应力及时效温度之间的关联本构模型。结果表明:随着实验应力的增大和时效温度的升高,2219铝合金的稳态蠕变速率增大,且蠕变曲线在第二阶段的持续时间缩短;依据本构方程计算出该铝合金在各条件下的稳态蠕变速率与其实验值的平均相对误差为4.22%,表明该本构方程可为2219铝合金蠕变时效成形工艺的制定提供理论依据。
在時效溫度為438~458 K、實驗應力為120~180 MPa的條件下,採用RWS-50型電子蠕變機對2219鋁閤金蠕變時效行為進行研究。採用包含雙麯正絃函數的方程,通過對實驗數據的線性迴歸分析,確定應力指數、蠕變激活能及相關常數,建立2219鋁閤金穩態蠕變速率與實驗應力及時效溫度之間的關聯本構模型。結果錶明:隨著實驗應力的增大和時效溫度的升高,2219鋁閤金的穩態蠕變速率增大,且蠕變麯線在第二階段的持續時間縮短;依據本構方程計算齣該鋁閤金在各條件下的穩態蠕變速率與其實驗值的平均相對誤差為4.22%,錶明該本構方程可為2219鋁閤金蠕變時效成形工藝的製定提供理論依據。
재시효온도위438~458 K、실험응력위120~180 MPa적조건하,채용RWS-50형전자연변궤대2219려합금연변시효행위진행연구。채용포함쌍곡정현함수적방정,통과대실험수거적선성회귀분석,학정응력지수、연변격활능급상관상수,건립2219려합금은태연변속솔여실험응력급시효온도지간적관련본구모형。결과표명:수착실험응력적증대화시효온도적승고,2219려합금적은태연변속솔증대,차연변곡선재제이계단적지속시간축단;의거본구방정계산출해려합금재각조건하적은태연변속솔여기실험치적평균상대오차위4.22%,표명해본구방정가위2219려합금연변시효성형공예적제정제공이론의거。
The creep aging behavior of 2219 aluminum alloy was studied on the RWS-50 electronic creep testing machine at 438-458 K with the stress range from 120 to 180 MPa. By adopting the equations including hyperbolic sine function and by linear regression analysis of experimental data, the stress index, the creep activation energy and the related constants were determined. The constitutive relationship among steady creep strain rate, tested stress and aging temperature of 2219 aluminum alloy was obtained. The results show that the steady creep rate increases with the increase of tested stress and aging temperature. And the second step in creep curves becomes short. The average relative error of steady creep strain rate between theoretical value computed by the constitutive equation and actual value is only 4.22%, and the constitutive equation can provide theoretical basis for formulating creep aging forming process of 2219 aluminum alloy.