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| INVESTIGATION OF Zr AS A SUBSTITUTE FOR Hf IN CAST Ni-BASE SUPERALLOYS |
| by ZHENG Yunrong; CAI Yulin; RUAN Zhongci(Institute of Aeronautical Materials; Beijing)(Manuscript received 6 June; 1986; revised manuscript 22 September; 1986) |
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Cite this article:
by ZHENG Yunrong; CAI Yulin; RUAN Zhongci(Institute of Aeronautical Materials; Beijing)(Manuscript received 6 June; 1986; revised manuscript 22 September; 1986). INVESTIGATION OF Zr AS A SUBSTITUTE FOR Hf IN CAST Ni-BASE SUPERALLOYS. Acta Metall Sin, 1987, 23(5): 430-433.
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Abstract Zr promotes the formation of eutectic γ′, MC, Ni_5Zr and (Zr, Ti)_2 SC and stabilizes the microstructure of Ni-base superalloys at high temperatures as that Hf does.Furthermore, it enhances the mechanical properties of as-cast alloys at medium temperatures. But the efficiency of it is not as strong as Hf, because of its lower solubility in eutectic γ′. However, the solubility of Zr in Ni_5M is higher than that of Hf, it is helpful to the formation of Ni_5 M. This implies that one can not substitute Zr for Hf with same atomic fraction. Combination of Zr and Hf additive is beneficial to the mechanical properties of the alloys at medium temperatures.
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Received: 18 May 1987
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1 Duhl D N.USPO 3700433,1972
2 马淑琴,郑运荣,蔡玉林.金属学报,1981;17:522b |
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