CAJ | 학술논문

基于动态材料模型，建立了TC18钛合金的热加工图，分析了能量耗散率、非稳定参数和热加工图随应变速率、变形温度的变化规律。结果表明，在800～900℃范围内，应变速率对TC18钛合金的热变形能量分配影响较为显著。不同应变下的能量耗散率峰值对应的变形工艺参数均为变形温度800～820℃、应变速率5×10－4～1×10－3 s－1，该参数即为TC18钛合金等温压缩变形的最佳工艺参数范围。随着应变增大，820℃／1×10－2 s－1附近的非稳定变形区域逐渐缩小，当应变达到0.3时消失；而（860～900）℃／（1～10）s－1的非稳定区随应变增大而逐渐扩大，并向低温区域扩展。
기우동태재료모형，건립료TC18태합금적열가공도，분석료능량모산솔、비은정삼수화열가공도수응변속솔、변형온도적변화규률。결과표명，재800～900℃범위내，응변속솔대TC18태합금적열변형능량분배영향교위현저。불동응변하적능량모산솔봉치대응적변형공예삼수균위변형온도800～820℃、응변속솔5×10－4～1×10－3 s－1，해삼수즉위TC18태합금등온압축변형적최가공예삼수범위。수착응변증대，820℃／1×10－2 s－1부근적비은정변형구역축점축소，당응변체도0.3시소실；이（860～900）℃／（1～10）s－1적비은정구수응변증대이축점확대，병향저온구역확전。
The processing map for TC18 titanium alloy was established based on dynamic materials modeling.The influences of strain rate and deformation temperature on the energy dissipation rates, instability parameters and thermal processing maps were analyzed.The results show that, in the range of 800℃to 900℃, strain rate has a significant effect on the energy distribution of TC18 titanium alloy.The deformation process parameters corresponding to peak power dissipation efficiency at different strain rate were all in range of 5 ×10-4 s-1 to 1 ×10-3 s-1 at 800℃to 820℃, namely the better technological parameter range of isothermal compression deformation for TC18 titanium alloy.As the strain increases, the area of instability near the range of 820 ℃/1 ×10 -2 s-1 gradually reducs, which enteres the stage of steady state flow when the strain reaches 0.3.The area of instability in the range of 1 s-1 to 10 s-1 at 860℃to 900 ℃gradually expands to the lower temperature region with the strain rate maintains between 1 s-1 to 10 s-1 along with the strain increases.