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Neutron diffraction study of stress and lattice mismatch induced by thermo-mechanical fatigue in single crystal superalloys

Vincent Ji Darren Hughes Thilo Pirling Sun Guang-Ai Chen Bo Chen Hua Wu Er-Dong Zhang Jun

Neutron diffraction study of stress and lattice mismatch induced by thermo-mechanical fatigue in single crystal superalloys

Vincent Ji, Darren Hughes, Thilo Pirling, Sun Guang-Ai, Chen Bo, Chen Hua, Wu Er-Dong, Zhang Jun
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  • Received Date:  01 April 2008
  • Accepted Date:  27 September 2008
  • Published Online:  05 February 2009

Neutron diffraction study of stress and lattice mismatch induced by thermo-mechanical fatigue in single crystal superalloys

  • 1. (1)巴黎第十一大学奥赛分子化学与材料学院,巴黎 91405; (2)法国劳厄-朗之万研究所,格勒诺贝尔 38042; (3)四川大学原子与分子物理研究所,成都 610065;中国工程物理研究院核物理与化学研究所,绵阳 621900; (4)中国工程物理研究院核物理与化学研究所,绵阳 621900; (5)中国科学院金属研究所材料科学国家实验室,沈阳 110016

Abstract: The center points of the thermomechanical fatigued single crystal Nibased superalloys were measured by neutron diffraction and the results have been treated in two methods: two overlapped peaks and a single peak. The macroscopic equivalent stress, deviatoric stress components, γ/γ′ phase equivalent stress and lattice mismatch are determined according to the experimental results. The stress results show that the macroscopic equivalent stresses are basically consistent when using two analysis methods, the maximum of macroscopic equivalent stress and deviatoric stress components appeared at thermomechanical fatigue that of 100 cycles, and at this point, the microdefects, such as dislocations, are saturated and the stress of γ′ phase away from the center was reduced remarkably. The calculated results also indicate that the negative lattice mismatch is reduce markedly at the beginning of the thermomechanical fatigue. Subsequently, it increases linearly with the fatigue cycles at the speed 81×10-6 per cycle because of the accumulated plastic strain in the matrix.

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