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研究了[001]取向的冷却叶片模拟试样的拉伸性能与断口。分别从温度、薄壁厚度以及气膜孔3个方面分析对其力学性能的影响。结果表明:薄壁圆管试样在过峰值温度后,抗拉强度与屈服强度随温度上升而降低,延伸率与截面收缩率则不断递增;2mm比1.5mm薄壁试样的抗拉强度、屈服强度、延伸率及截面收缩率都要大;带气膜孔试样存在应力应变集中,导致其抗拉强度与屈服强度,延伸率与截面收缩率都要比不带气膜孔试样的低。对试样断口进行SEM分析,结果表明在中温和高温条件下,断口呈现不同的断裂特点,850℃的试样断面由光滑斜平面组成,而980℃的断口则以韧窝断裂为主。
The tensile properties and fracture of [001] oriented cooling blade were studied. From the temperature, the thickness of the thin wall and the film hole three aspects of the analysis of its mechanical properties. The results show that the tensile strength and yield strength decrease with the increase of temperature and the elongation and cross-section shrinkage increase with the increase of the peak temperature. The tensile strength and yield strength , Elongation and cross-sectional shrinkage should be large; with the film hole sample stress and strain concentration, resulting in its tensile strength and yield strength, elongation and cross-sectional area shrinkage rate than the sample without the hole is low. SEM analysis of the specimen fracture shows that the fracture shows different fracture characteristics under moderate temperature and high temperature. The fracture surface at 850 ℃ consists of a smooth inclined plane, while the fracture at 980 ℃ is mainly dimple fracture.