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| EFFECT OF CERTAIN ALLOYlNG ELEMENTS ON THE MECHANICAL PROPERTIES OF A WROUGHT NICKEL-IRON BASE SUPERALLOY |
| Wang Yunshi;Wang Sukun;Zhang Shunnan;Zhao Yucai;Li Shijin |
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Cite this article:
Wang Yunshi;Wang Sukun;Zhang Shunnan;Zhao Yucai;Li Shijin. EFFECT OF CERTAIN ALLOYlNG ELEMENTS ON THE MECHANICAL PROPERTIES OF A WROUGHT NICKEL-IRON BASE SUPERALLOY. Acta Metall Sin, 1979, 15(2): 187-196.
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Abstract The effects of certain alloying elements such as titanium, aluminium, molyb-denum, carbon, boron, etc. on the tensile, impact and stress-rupture propertiesof a 42Ni-35Fe-13Cr superalloy have been investigated. Titanium or molybdenumincreased the 0.2% proof stress, the elongation, and the impact properties at roomtemperature as well as the stress-rupture life of the alloy at elevated temperatures.The presence of aluminium up to 0.3% accelerated the formation of γ'-Ni_3 (Ti, Al).Carbon and boron promoted the formation of fine grain size, with an optimumat 0.035% C and 0.010% B, where a maximum stress-rupture life of such analloy was obtained. The strengthening mechanism of the above alloying elementsand their optimum contents are discussed. It is emphasized that a close controllof the carbon and boron contents of the alloy and demand of high quality andcleanness of the ingot are particularly important.
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Received: 18 February 1979
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