The Influences of Cobalt on the Mechanical Properties of Refractoloy 26 and the Study of the Possibility of Lowering Cobalt Content in the Alloy
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摘要: 本文研究了鈷對Fe-Cr-Ni-Co基Refractoloy26合金力學性能的影響。以鎳取代原合金中的鈷配制了分別含有0、7、14和20Co%wt四種不同成份的合金。實驗測定了合金的室溫和高溫拉伸性能,測定了不同含鈷量合金的楊氏摸量和切變摸量隨溫度變化的關系,研究了合金在565℃和不同外加應力條件下的蠕變行為。實驗結果證明:降低合金含鈷量對合金的瞬時拉伸性能沒有顯著影響,但顯著影響合金的蠕變速率和蠕變斷裂壽命。研究證明,合金的蠕變性能和合金基體的堆垛層錯能密切相關,εs∞γs2。文中對在Refractoloy26合金中的節鈷可能性問題也作了討論。Abstract: This paper deals with the effects of cobalt on the mechanical properties of Fe-Cr-Ni-Co base superalloy Refractoloy26.Cobalt is replaced by nickel to produce 0,7,14 and the standard 20 pct cobalt versions of the alloy. Tensile properties at room temperature and elevated tempratures,temperature dependence of Young's modulus and shear modulus, and the creep properties at 565℃ and varied applied stresses are experimentally determined. The results ndicate that lowering cobalt content has a little influence on the tensile properties, but a great influence on the creep rate and the stress rupture life. It is proved that the creep properties of the alloys depend directly on the ivalues of stacking fault energy in matrices. The possilility of lowering cobal content in Refractoloy 26 also has been discussed.
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