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Residual Stress Evolution and Its Mechanism During the Manufacture of Superalloy Disk Forgings |
BI Zhongnan1,2(),QIN Hailong1,2,DONG Zhiguo3,WANG Xiangping3,WANG Ming3,LIU Yongquan3,DU Jinhui1,2,ZHANG Ji1,2 |
1. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China 2. CISRI-GAONA Co. , Ltd. , Beijing 100081, China 3. AECC Shenyang Engine Research Institute, Shenyang 110005, China |
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Cite this article:
BI Zhongnan,QIN Hailong,DONG Zhiguo,WANG Xiangping,WANG Ming,LIU Yongquan,DU Jinhui,ZHANG Ji. Residual Stress Evolution and Its Mechanism During the Manufacture of Superalloy Disk Forgings. Acta Metall Sin, 2019, 55(9): 1160-1174.
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Abstract Significant interior residual stresses, which were generated during the manufacture process, could affect the machining dimension precision and structural stability during the subsequent machining process and service operation in the superalloys component, such as turbine disk. In this paper, the neutron diffraction method and contour method are described for measuring the distribution of interior residual stresses. The distribution, evolution of interior residual stress, and its mechanism are analyzed during quenching, ageing heat treatment and machining process in superalloys disk forging. The residual stresses are mainly generated by the temperature gradient formed during rapid cooling after solution heat treatment. After quenching, the residual stresses in hoop direction and radial direction of disc forging are significant, and its distribution along the profile is characterized by "internal tension and external pressure". The magnitudes of the residual stresses are equivalent to the yield strength of as-quenched alloys at room temperature. Quenching-induced residual stresses are partially relieved during the ageing process due to plastic strain and creep-controlled dislocation rearrangement. The precipitation behavior of γ″ or γ′ phase during heat treatment has a significant interaction with the distribution and magnitude of residual stress. During the machining process, part of the residual stresses contributing to the equilibrium of the internal forces are removed along with the material. Additional moment caused by re-balance of residual stresses results in the serious consequences of distortion in the remaining body.
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Received: 01 April 2019
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Fund: Supported by National Natural Science Foundation of China(U1708253);National Key Research and Deve-lopment Program of China(2017YFB0702901);Shenzhen Municipal Science and Technology Inovation Council(JCYJ20160608161000821) |
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