Effect of chemical composition on microstructure and mechanical properties of GH4169 alloy

doi:10.13251/j.issn.0254-6051.2020.12.039

Abstract

Abstract: The microstructure and tensile properties of GH4169 alloy with different Nb, Al and Ti contents were studied after solution and aging treatment. The results show that under certain Al/Ti and (Al+Ti)/Nb ratios, the δ phase increases in amount with the increase of Nb content and has better high temperature stability; meanwhile, the high temperature solution treatment can effectively prevent grain growth and ensure the fine grain strengthening by the stable δ phase. When the Al/Ti and (Al+Ti)/Nb ratios are relatively low, the contents of γ″ and γ' phases decrease, and the morphology of γ″ changes from lip-shape to disc-shape or sesame-like shape, in this case the Nb element will mainly form δ phase. The results of mechanical properties show that when the Al/Ti and (Al+Ti)/Nb ratios are similar, the tensile strength is mainly affected by grain size, while the effect of δ phase content is less. However, when the Al/Ti and (Al+Ti)/Nb ratios are relatively low, due to the quantity and morphology changes of the strengthening phases γ″ and γ', the tensile properties are significantly poorer, and the microhardness also decreases along with the decrease of tensile strength.

Key words: GH4169 alloy, alloying element, mechanical properties, microstructure

CLC Number:

TG135⁺.4

Ma Jun, Shen Jialin, Li Maoming, Liang Yu. Effect of chemical composition on microstructure and mechanical properties of GH4169 alloy[J]. Heat Treatment of Metals, 2020, 45(12): 197-204.

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