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本文研究了定向凝固镍基高温合金DZ5的高温瞬拉及持久断裂特性之晶体取向关系。试验于700、950℃两种温度条件下进行。用背反射劳埃法测定了试样拉伸轴偏离柱晶凝固方向〈100〉的真实偏角。结果表明,在700℃,瞬拉强度及持久寿命有明显取向关系。在偏角20°之内,上述性能急剧下降;而在950℃,尚未发现明显取向关系。上述取向关系用Schmid规律和交滑移强化机理得到合理解释。光学及电子扫描断口分析表明,随柱晶偏角增大,断裂特征有明显变化。
In this paper, the crystal orientation relationship between the high-temperature instantaneous pull-pull and the long-term rupture behavior of the directionally solidified Ni-based superalloy DZ5 was studied. Test at 700,950 ℃ two temperature conditions. The true declination angle of the tensile axis of the sample from the solidification direction of the columnar crystal <100> was measured by the back-reflection Railay method. The results show that at 700 ℃, instantaneous tensile strength and long-term life have obvious orientation relationship. In the declination angle of 20 °, the performance of a sharp decline in the 950 ° C, but no obvious orientation relationship. The above orientation relationship is explained by Schmid’s law and cross-slip enhancement mechanism. Optical and electronic scanning fracture analysis showed that with the column crystal angle increases, the fracture characteristics of significant changes.