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| DISTRIBUTION OF La IN SUPERALLOY Ni-20Cr-20Co-18W AND ITS INFLUENCE ON STRESS RUPTURE PROPERTY |
| by WANG Yanqing; WEI Yuhuan; YANG Nansen (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 17 February; 1986; revised manuscript 9 August. 1986) |
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Cite this article:
by WANG Yanqing; WEI Yuhuan; YANG Nansen (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) (Manuscript received 17 February; 1986; revised manuscript 9 August. 1986). DISTRIBUTION OF La IN SUPERALLOY Ni-20Cr-20Co-18W AND ITS INFLUENCE ON STRESS RUPTURE PROPERTY. Acta Metall Sin, 1987, 23(4): 299-305.
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Abstract The distribution of La in a superalloy Ni-20Cr-20Co.-18W is found out to be enriched mainly along its grain boundaries as oxide and oxysulphide. Some of the oxide may be formed the nuclei of the carbide M_6C. The La improves significantly the stress rupture life under 39 MPa at 1000℃ and raises the creep activation energy of the superalloy. The grain boundary energy was evaluated by thermal etching technique and the vacancy formation energy was measured by temperature dependence of resistivity. A theoretical interpretation was made that the contribution of La to decreasing boundary energy and increasing the vacancy formation energy is the main causes of the improvement of stress rupture property of the superalloy.
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Received: 18 April 1987
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