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ELIMINATION OF σ-PHASE IN SUPERALLOYS BY LASERGLAZE |
GE Yunlong; HU Zhuangqi;GAO Wei; SHI Changxu (Shih Chang-hsu) (Institute of Metal Research; Academia Sinica; Shenyang); XU Xiaobo; LI Zhang; JIANG Ming (Jilin University of Technology; Changchun) (Manuscript received 6 July; 1983; revised manuscript 6 December; 1983) |
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Cite this article:
GE Yunlong; HU Zhuangqi;GAO Wei; SHI Changxu (Shih Chang-hsu) (Institute of Metal Research; Academia Sinica; Shenyang); XU Xiaobo; LI Zhang; JIANG Ming (Jilin University of Technology; Changchun) (Manuscript received 6 July; 1983; revised manuscript 6 December; 1983). ELIMINATION OF σ-PHASE IN SUPERALLOYS BY LASERGLAZE. Acta Metall Sin, 1984, 20(4): 237-378.
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Abstract A cast Ni-base superalloy containing very high contents of Al and Ti (Al+Ti=13.5 wt-%) has been treated by laser rapid melting and solidification. Influence of laserglaze on microstructure and distribution of alloying elements have been studied by TEM, SEM and EMPA. Results showed that the microstructure has changed obviously in the laser treated region, in which alloying elements distributed homogeneously. All the large γ+γ' eutectic, γ'+β peritectic and MC carbides were eliminated. Particularly, microstructure of the laser treated region is excellently thermal stable. Due to extremely high Al+Ti content the σ-phase already existed in cast structure, after aging at 950℃ for 18h, precipitated in enormous quantity. But after laserglaze, no σ-phase was found even aging for 264h. It was evident that if alloy specimen with large quantity of σ-phase was laser treated, not only all the σ-phase particles have been dissolved, but also they could not reprecipitate out even after prolonged aging. Laserglaze can be applied to improve the microstructure and properites of known superalloys, suppressing the precipitation of harmful phases by prior laser surface treatment on machine parts, or eliminating harmful phases present in used parts. It can also be adopted as a powerful means to extend the solid solubility of alloying elements in order to develop new materials.
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Received: 18 April 1984
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1 金柱;马实基,金属学报,10(1974) ,12. 2 Breinan, E. M.; Kear, B. H.; Banas, M. C.; Greenwald, L. E., Superalloys-Metallurgy and Manufacture, Proc. of the 3rd Int. Symp., Seven Springs, PA., Eds. Kear, B. H.; Muzyka, D. R.; Tien, J. K.; et al, Baton Rouge, Claitor's Publ., 1976, p. 435. 3 Snow, D. B.; Breinan, E. M.; Kear, B. H., Superalloys, 1980, Proc. of the 4th Int. Symp. on Superalloys, Seven Springs, PA., Eds. Tien. J. K.; Wloodek, S. T.; Morrow, H., Ⅲ, et al, ASM, Metals Park, Ohio, 1980, p. 189. |
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