STUDY ON CRACK FORMATION OF P/M SUPERALLOY DURING HEAT TREATMENT
HU Benfu; LI Huiying; ZHANG Shouhua (Beijing University of Iron and Steel Technology)(Manuscript received 21 April; 1985)
Cite this article:
HU Benfu; LI Huiying; ZHANG Shouhua (Beijing University of Iron and Steel Technology)(Manuscript received 21 April; 1985). STUDY ON CRACK FORMATION OF P/M SUPERALLOY DURING HEAT TREATMENT. Acta Metall Sin, 1987, 23(2): 217-252.
Abstract The effect of previous powder-particle boundaries (PPB) on the quench crack has been studied. The serious quench crack is due to the PPB caroides and on their surfaces formation of rich-oxygen layer destroying continuity of alloy and promoting fracture along the previous particle boundaries. The slight quench crack is due to the precipitation in a coarse form at the grain boundaries of γ'-phase. The coarse predipitates are surrounded by Al, Ti depleted zones forming oxide layers which promote the fracture path along the grain boundaries of γ-phase. The major reasons of the formation of quench cracks are the contamination of oxygen and unsuitable quench cooling rate.
1 Tien J K, Boesch W J, Howson T E, Castledine W B. P/M Superalloys Aerospace Materials for the 1980's Metal Powder Report Confernce, Zurich, Switzerland, Nov, 1980 2 Aubin C, Davidson J H, Trottier J P. In: Tien J K, ed. Proc. 4th Int. Superalloy Symposium, Seven Springs, 21-25 Sept. 1980, Ohio: ASM, 345-254 3 Waters R E, Charles J A, Lea C. Met Technol, 1981; 8: 194-200 4 Radavich J F, English R. Proc. of Third Annual Purdue University Student-Industry High Temperature Materials Seminar, Dec. 8, 1975, West Lafayette, Indiana 5 胡本芙,金属材料研究,1981;7(2) :4 6 Ingesten N G, Warren R, Winberg L. High Temperature Alloys for Gas Turbines, 1982． In:Brunetand R, et al, eds. Proc. of a Conf'. held in Liege Belgium, 4-6 October 1982, 1013-1027 7 Heat Transfer Modeling and Analytical Quenching of a Powder Metallurgy Turbine Disk During Heat Treatment USARTL-TR-78-6n
