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DYNAMICS OF PRECIPITATION AND TRANSFORMATION OF CARBIDES IN A Ni-BASE SUPERALLOY |
HUANG Qianyao;SHI Yanyu Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing |
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Cite this article:
HUANG Qianyao;SHI Yanyu Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing. DYNAMICS OF PRECIPITATION AND TRANSFORMATION OF CARBIDES IN A Ni-BASE SUPERALLOY. Acta Metall Sin, 1988, 24(6): 399-403.
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Abstract The quantitative analytical method connecting the electrolyticextraction to X-ray diffraction analysis to determine the carbides and TCP in a Ni-base superalloy was developed. The alteration of decomposition of MC and precipi-tation of M_(23) C_6 and M_6 C with hot-exposure time under 850—1000℃ is shown ashyperbolic pattern. The elemental constitution of M_(23) C_6 changes continuously underhot exposure, (Cr_(0.67)Mo_(0.13)Ni_(0.13)Co_(0.07))_(23)C_6 precipitates from the beginning and (Cr_(0.88)Mo_(0.07)Ni_(0.03)Co_(0.02))_(23)C_6 On the end with the contents in increasing Cr and decreasingMo, Ni and Co. The higher the hot exposure temperature, the faster the final con-stitution of M_(23)C_6 may be easily achieved.
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Received: 18 June 1988
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1 Collins H E, Quigg R J. ASM Trans Q, 1968; 61 (1) : 139 2 Collins H E. ASM Trans Q, 1969; 62 (1) : 82 3 Sims C T. In: Sims C T, Hagel W C et al. eds, The Superalloys, New York: Wiley, 1972: 259 |
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