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一、前言 高温合金定向凝固是近代航空发动机叶片采用的先进技术,柱状晶按[001]择优取向,消除了与主应力轴垂直的横向晶界,从而提高了合金[001]方向的蠕变强度、塑性、抗热疲劳等综合性能,大幅度地延长零件的使用寿命。 由于各向异性,定向材料的横向以及纵向
I. INTRODUCTION Directional solidification of superalloy is an advanced technique adopted by modern aviation engine blades. The preferential orientation of columnar crystals by [001] eliminates the transverse grain boundaries perpendicular to the principal stress axis, thereby increasing the creep strength in the [001] direction of the alloy , Plastic, thermal fatigue and other comprehensive performance, significantly extend the service life of parts. Due to anisotropy, the material is oriented both laterally and longitudinally