CAJ | 학술논문

采用等温单向压缩方法研究V?5Cr?5Ti (质量分数，%)合金在温度为1423?1573 K、应变速率为0.01?1 s?1条件下的流变应力和组织演化行为。结果表明，流变应力曲线需进行摩擦力修正，摩擦因数 m 的测量值为0.45?0.56。采用线性回归方法拟合得到合金的 Arrhenius 型本构方程，拟合计算应力和实验应力的线性关系，其R2和平均绝对误差值(AARE)分别为0.948和5.44%。表观激活能Qa的取值范围为540?890 kJ/mol。连续动态再结晶(CDRX)和不连续动态再结晶(DDRX)机制在热压缩合金中并存。但合金在真应变为1.5的条件下，应变软化的机制仍然以动态回复(DRV)为主。
채용등온단향압축방법연구V?5Cr?5Ti (질량분수，%)합금재온도위1423?1573 K、응변속솔위0.01?1 s?1조건하적류변응력화조직연화행위。결과표명，류변응력곡선수진행마찰력수정，마찰인수 m 적측량치위0.45?0.56。채용선성회귀방법의합득도합금적 Arrhenius 형본구방정，의합계산응력화실험응력적선성관계，기R2화평균절대오차치(AARE)분별위0.948화5.44%。표관격활능Qa적취치범위위540?890 kJ/mol。련속동태재결정(CDRX)화불련속동태재결정(DDRX)궤제재열압축합금중병존。단합금재진응변위1.5적조건하，응변연화적궤제잉연이동태회복(DRV)위주。
To clarify the high temperature flow stress behavior and microstructures evolution of a V?5Cr?5Ti (mass fraction, %) alloy, the isothermal hot compression tests were conducted in the temperature range of 1423–1573 K with strain rates of 0.01, 0.1, and 1 s?1. The results show that the measured flow stress should be revised by friction and the calculated values of friction coefficient m are in the range of 0.45?0.56. Arrhenius-type constitutive equation was developed by regression analysis. The comparison between the experimental and predicted flow stress shows that theR2 and the average absolute relative error (AARE) are 0.948 and 5.44%, respectively. The measured apparent activation energyQa is in the range of 540–890 kJ/mol. Both dis-continuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) mechanisms are observed in the deformed alloy, but dynamic recovery (DRV) is the dominant softening mechanism up to a true strain of 1.5.