CAJ | 학술논문

本文利用热压缩法研究了TC18合金的热变形行为，并计算了合金在α＋β两相区和β单相区变形激活能，得到了相应的流变应力本构方程。研究结果表明，TC18钛合金在α＋β双相区变形时，在较低温度和较高应变速率条件下流变曲线呈现典型的单一峰值的再结晶，并且随变形温度的提高，出现多峰值的再结晶的特征；TC18钛合金在β单相区变形时，流变曲线出现了较长的平缓阶段，而后在较大应变时出现了标志再结晶的峰值应力；经计算得到TC18钛合金β单相区的变形激活能为260．84kJ/mol，α＋β双相区的应变激活能336．356 kJ/mol。经过拟合得到了TC18钛合金在α＋β双相区和β单相区变形的流变应力本构方程。
본문이용열압축법연구료TC18합금적열변형행위，병계산료합금재α＋β량상구화β단상구변형격활능，득도료상응적류변응력본구방정。연구결과표명，TC18태합금재α＋β쌍상구변형시，재교저온도화교고응변속솔조건하류변곡선정현전형적단일봉치적재결정，병차수변형온도적제고，출현다봉치적재결정적특정；TC18태합금재β단상구변형시，류변곡선출현료교장적평완계단，이후재교대응변시출현료표지재결정적봉치응력；경계산득도TC18태합금β단상구적변형격활능위260．84kJ/mol，α＋β쌍상구적응변격활능336．356 kJ/mol。경과의합득도료TC18태합금재α＋β쌍상구화β단상구변형적류변응력본구방정。
The deformation behaviors of TC 18 alloy are studied by Hot compressive method in this pa-per, as well as the deformation active energy in βand α+βphase and flow stress constitutive equa-tions are calculated .The results show that the deformation in α+βphase is at low temperature and high deformation rate shows the recrystallization has characteristics with single peak and increasing temperature results in more than one peaks .The deformation in βphase show a long flat stage fol-lowed by a peak stress which suggests recrystallization .The deformation active energy in βandα+βphase are 260.84 and 336.356kJ/mol, respectively.Finally, flow stress constitutive equations are gotten.