CAJ | 학술논문

在温度1323~1473 K，应变速率0.001~1 s-1的范围内研究了Ti-43Al-4Nb-1.4W-0.6B 合金的热压缩变形行为，其真应力-真应变曲线表明合金在变形过程出现了动态软化行为。依据经过摩擦和温度修正后流变应力的曲线，获得了该合金的本构方程，其中Zener-Holloman指数方程描述了温度和应变速率对变形行为的影响，以此构建五次多项式组来描述应变对材料参数的影响,其预测结果与实验结果相符。同时，建立了该合金的热加工图，并据此加工图预测出该合金合适的加工参数为1343 K和0.02 s-1，且成功地完成了在工业生产条件下对圆柱形试样的锻造。
재온도1323~1473 K，응변속솔0.001~1 s-1적범위내연구료Ti-43Al-4Nb-1.4W-0.6B 합금적열압축변형행위，기진응력-진응변곡선표명합금재변형과정출현료동태연화행위。의거경과마찰화온도수정후류변응력적곡선，획득료해합금적본구방정，기중Zener-Holloman지수방정묘술료온도화응변속솔대변형행위적영향，이차구건오차다항식조래묘술응변대재료삼수적영향,기예측결과여실험결과상부。동시，건립료해합금적열가공도，병거차가공도예측출해합금합괄적가공삼수위1343 K화0.02 s-1，차성공지완성료재공업생산조건하대원주형시양적단조。
High temperature compressive deformation behaviors of as-cast Ti-43Al-4Nb-1.4W-0.6B alloy was investigated at temperatures ranging from 1323 K to 1473 K, and strain rates from 0.001 s-1 to 1 s-1. The results indicated that the true stress-true strain curves show a dynamic flow softening behavior. The flow curves after the friction and the temperature compensations were employed to develop constitutive equations. The effects of temperature and the strain rate on the deformation behavior were represented by Zener-Holloman exponential equation. The influence of strain was incorporated in the constitutive analysis by considering the effect of the strain on material constants by a five-order polynomial. A revised model was proposed to describe the relationships among the flow stress, strain rate and temperature and the predicted flow stress curves were in good agreement with experimental results. Appropriate deformation processing parameters were suggested based on the processing map which was constructed from friction and temperature corrected flow curves, determined as 1343 K, 0.02 s-1 and were successfully applied in the canned forging of billets to simulate industrial work condition.