CAJ | 학술논문

为了解决Cr20 Ni80电热合金锻造开裂的问题,在Gleeb-1500D热模拟试验机上对该合金进行热压缩试验,研究变形温度为900~1220℃,应变速率为0.001~10 s-1条件下的热变形行为,并根据动态材料模型建立合金的热加工图.合金的真应力-真应变曲线呈现稳态流变特征,峰值应力随变形温度的降低或应变速率的升高而增加；热变形过程中稳态流变应力可用双曲正弦本构方程来描述,其激活能为371.29 kJ·mol-1.根据热加工图确定了热变形流变失稳区及热变形过程的最佳工艺参数,其加工温度为1050~1200℃,应变速率为0.03~0.08 s-1.优化的热加工工艺在生产中得到验证.
위료해결Cr20 Ni80전열합금단조개렬적문제,재Gleeb-1500D열모의시험궤상대해합금진행열압축시험,연구변형온도위900~1220℃,응변속솔위0.001~10 s-1조건하적열변형행위,병근거동태재료모형건립합금적열가공도.합금적진응력-진응변곡선정현은태류변특정,봉치응력수변형온도적강저혹응변속솔적승고이증가；열변형과정중은태류변응력가용쌍곡정현본구방정래묘술,기격활능위371.29 kJ·mol-1.근거열가공도학정료열변형류변실은구급열변형과정적최가공예삼수,기가공온도위1050~1200℃,응변속솔위0.03~0.08 s-1.우화적열가공공예재생산중득도험증.
To solve the problem of forging cracks, the hot deformation behavior of Cr20 Ni80 electrothermal alloy was investigated by compression tests on a Gleeble-1500D thermal simulation machine in a temperature range of 900 to 1220℃ and a strain rate of 0. 001 to 10 s-1 . The hot processing map of the alloy was established according to the dynamic materials model ( DMM) . It is found that the true stress-true strain curves have steady-state flow characteristics. The peak stress increases with decreasing deformation temperature or increasing strain rate. The flow behavior is described by a hyperbolic sine constitutive equation, and the activation energy of the alloy is about 371. 29 kJ·mol-1 . Based on the processing map, the process of hot deformation in the temperature range at different strain rates can be attained, of which the optimum hot deformation temperature ranges in 1050-1200℃ and the strain rate is 0. 03-0. 08 s-1 , and the instability zones of flow behavior can also be recognized. The optimal hot-working technology is validated to be successful in production.