INFLUENCE OF LASERGLAZE ON MICROSTRUCTURE AND WEAR RESISTANCE OF A CAST Ni-BASE SUPERALLOY
by GE Yunlong; HU Zhuangqi; GAO Wei; SHI Changxu (C. H. Shih) (Institute ol Metal Research; Academia Sinica; Shenyang) (Manuscript received 8 August; 1983)
Cite this article:
by GE Yunlong; HU Zhuangqi; GAO Wei; SHI Changxu (C. H. Shih) (Institute ol Metal Research; Academia Sinica; Shenyang) (Manuscript received 8 August; 1983). INFLUENCE OF LASERGLAZE ON MICROSTRUCTURE AND WEAR RESISTANCE OF A CAST Ni-BASE SUPERALLOY. Acta Metall Sin, 1984, 20(2): 71-205.
Abstract Study was made of the influence of the laserglaze on the micro-structure and the wear resistance of a cast Ni-base superalloy containing abundance of refractory metals, i. e. Mo 33 wt-％ and W 17 wt-％. Owing to the high contents of Mo and W, this new alloy makes its cast structure coarse and. seriously segregated and forms a large amount of phases of higher melting point. Experimental results show that the microstructure of such superalloy may be extraordinarily improved after surface treatment by laserglaze of very high energy density. All high melting point phases vanish. The solid solubility increases greatly. The crystalline structure becomes finer. The fine dendritic, cellular dendritic, cellular and plane front solidification structures are found in various parts of melted region. In the laser melted zone, the alloying elements distribute uniformly. Thus, the segregation in the alloy may be substantially eliminated by the treatment of this new technique. The change of its microstructure favours the further improvement of the properties, e. g. , the hardness of the laser melted zone is evidently increased and the wear resistance both in dry environment and in acid medium is also enhanced.
1 Breinan, E. M., Phys. Today, 29 (1976) , №. 11, 44． 2 Kear, B. H.; Breinan, E. M.; Greenwald, L. E., Met. Technol., 6 (1979) , №. 4, 121． 3 Mordike, B. L.; Bergmann, H. W., Rapidly Solidified Amorphous and Crystalline Alloys, Proc. of the Materials Research Society, Eds. Kear, B. H.; Giessen, B. C.; Cohen, M., Boston, MA, USA, North-Holland, 1981, p. 463． 4 Strutt, P. R.; Lewis, B. G.; Kear, B. H., Rapidly Solidified Amorphous and Crystalline Alloys, Proc. of the Materials Research Society, Eds. Kear, B. H.; Giessen, B. C.; Cohen, M., Boston, MA, USA, North-Holland, 1981, p. 485． 5 Breinan, E. M., Proceedings of the International Conference on Rapid Solidification Processing, Reston, Virginia, USA, 1977, p. 87． 6 Snow, D. B.; Breinan, E. M.; Kear, B. H., Superalloy 1980, Proc. of the Fourth International Symposium of Superalloys, Seven Springs, PA, USA, Eds. Tien, J. K.; Wlodek, S. T.; Morrow, H., Ⅲ; Gell, M; Maurer, G. E., ASM, Metals Park, Ohio, 1980, p. 189． 7 Hansen, M., Constitution of Binary Alloys, 2nd ed., McGraw-Hill, 1958, p. 968． 8 Ge Yun-Long; Wan Jing-Yun; Shih Chang-Hsu, Pract. Met., 19 (1982) , 561． 9 Kuo Yun-Yi; Liu Yong; Ge Yun-Long, to be published in Pract. Met. 10 Mehrabian, R, Solidification Technology, Proc. of Army Mat. Technology Conf. Portsmouth, NH, Eds, Burke, J. J.; Flemings, M. C.; Gorum, A. E., Brook Hill Publishing Co., 1974, p. 299． 11 Eyre, T.S., Tribol. Int., 9 (1976) , 203． 12 Rigney, D. A.; Glaeser, W. A., Metals Handbook, 9th. ed., Vol. 1, ASM, Metals Park, Ohio, 1978, p. 597． 13 Budinski, K. G., Wear of Materials 1977, International Conf. on Wear of Materials, St. Louis, Missouri, Eds. Glacser, W. A.; Ludema, K. C.; Rhee, S. K., ASME, 1977, p. 100．
