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    • 8. 发明授权
    • Single crystal articles having controlled secondary crystallographic
orientation
    • 具有受控次级晶体取向的单晶制品
    • US4605452A
    • 1986-08-12
    • US330757
    • 1981-12-14
    • Anthony E. GemmaJames A. Dierberger
    • Anthony E. GemmaJames A. Dierberger
    • F01D5/14C22C1/02C22C19/03C30B11/00C30B11/14C30B21/02C30B29/52F01D5/28C22C19/05
    • C30B11/14C30B11/00C30B29/52
    • Alignment of the [001] crystal axis of a face centered cubic metal with the primary z axis of a single crystal article provides good thermal fatigue resistance along the z axis, and minimizes cracking transverse to the axis. However, significant cracking is still observed parallel the z axis in severe applications. This cracking can be reduced by controlling the secondary crystallographic orientation (i.e., orientation of crystal axes within x-y planes transverse to the z axis), to make the [110] crystal axis tangent to the article surface in the region most prone to thermal fatigue cracking. Algorithims derived from empirical relationships enable calculation of the orientation likely to produce improved fatigue resistance. More durable single crystal gas turbine blades result when the [110] crystal axis is made tangent to the blade surface in the critical crack prone regions just behind the leading edge of the airfoil at about 40-80% of the airfoil span. A representative improved gas turbine blade will have a secondary orientation angle .alpha. of -10 to +20 degrees, where .alpha. is the angle between the [100] crystal axis and the y axis.
    • 面心立方金属的[001]晶轴与单晶制品的主z轴的对准提供了沿z轴的良好的耐热疲劳性,并且使横向于轴的裂纹最小化。 然而,在严重应用中,平行于z轴仍然发现明显的裂纹。 可以通过控制二次晶体取向(即,横向于z轴的xy平面内的晶轴的取向),使得[110]晶轴与最容易发生热疲劳裂纹的区域中的物品表面相切,可以减少这种裂纹 。 衍生自经验关系的算法可以计算可能产生改善的抗疲劳性的方向。 在翼型前缘的正后方的[110]晶轴相对于叶片表面在叶片表面相对于翼型跨度的大约40-80%时产生更耐用的单晶燃气轮机叶片。 代表性的改进燃气轮机叶片将具有-10至+20度的次方向角α,其中α是[100]晶轴和y轴之间的角度。