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本文对 DD_3单晶高温合金的中温横向持久性能的各向异性作了研究。采用横向试样研究取向度对横向持久性能的影响,比较接近用引晶法生产的叶片的真实横向性能。现已发现,结晶取向对 DD_3单晶合金中温持久性能的影响,不论在纵向或横向都遵循相同的规律。影响横向中温持久性能的主要因素是横向的结晶取向;应力轴平行或垂直于一次枝晶干对 DD_3合金的中温持久性能的影响比较小。在760℃时,取向对持久性能的影响比850℃下更为显著。应力方向靠近[100]时,DD_3合金760℃横向持久强度达σ_(>100)~(760)=80kg/mm~2;而当应力方向靠近[101]时,760℃横向持久强度仍保持σ_(>100)~(760)=54kg/mm~2,为纵向性能的2/3,亦能充分满足发动机设计对叶片横向性能的要求。
In this paper, the anisotropy of DD_3 single crystal superalloy at mid-temperature transverse ductility has been studied. The horizontal samples were used to study the effect of the degree of orientation on the transverse long-term performance, which is closer to the true transverse performance of the blades produced by the seeding method. It has been found that the effect of crystallographic orientation on the temperature-lasting properties of a DD_3 single crystal alloy follows the same rules in both the longitudinal and transverse directions. The main factors that affect the ductility of transverse temperature are the transverse crystal orientation. The effect of stress axes parallel to or perpendicular to the primary dendrites on the mid-temperature ductility of DD_3 alloy is relatively small. At 760 ° C, the effect of orientation on long-term performance is more pronounced than at 850 ° C. When the direction of stress is close to [100], the transverse strength at 760 ℃ of DD_3 alloy reaches σ_ (100) ~ (760) = 80kg / mm ~ 2, while the transverse strength at 760 ℃ remains σ_ (> 100) ~ (760) = 54kg / mm ~ 2, which is 2/3 of the longitudinal performance. It can also fully meet the requirements of engine design for horizontal blade performance.