In-situ tensile of nickel-based single crystal superalloys with different orientations at 650 ℃
Nickel-based single crystal superalloys for aircraft turbine engine blades are generally subjected to anisotropic stresses during service processes,which result in material failures.Here,nickel-based single crystal superalloys with[(1)40],[(3)40]and[(1)(2)2]orientations were in-situ stretched at 650 ℃ by self-developed in-situ stretching equipment.The[(1)40]-oriented sample showed a small magnitude of stress drop after yielding stage when the sample was hardened to the late stage of plastic deformation.The sample was cracked in the matrix where the slip traces were located under the stress.The crack was extended in the direction of the slip traces until the samples were fractured.Continuous stress drop was observed in the[(3)40]oriented sample during the whole plastic deformation.Defects were formed at holes,which led to the material failure.The[(1)(2)2]oriented sample was kept in the hardening stage.Stress drop was observed at the late plastic deformation stage.The sample showed the same manner as the[(3)40]oriented sample.This work provides key insights into the improvement of the service life of alloys under working conditions.
nickel-based single crystal superalloysin-situ tensileslip analysismechanical properties
万方数据
维普
