针对Inconel 718合金的不同用途,分析研究了4种常用热处理工艺对Inconel 718合金组织和力学性能的影响。结果表明：固溶温度超过1020℃时,奥氏体晶粒显著长大。合金中主要析出相有MC、δ、γ＇和γ″相。δ相沿晶界分布,1025℃固溶时呈颗粒状少量析出;950℃固溶时呈块状大量析出;直接时效时呈网状不连续分布。同时,δ相对合金的晶粒度影响较大,且其析出数量和形态决定了合金的韧塑性,γ″、γ＇相的析出量和尺寸与晶粒尺寸决定了合金的强度变化。
In view of different applications of Inconel 718 alloy, the influence of four kinds of heat treatment on mierostructure and mechanical performance of the alloy was investigated. The results indicate that the austenite grains grow observably when solution temperature exceeds 1020 %. The main precipitated phases of Inconel 718 alloy are MC,δ,γ＇ and γ＂. It is found that a few of blocky phase are formed along grain boundaries when the solution temperature is 1025 ℃ ,a large amount of blocky 8 phase are observable in the alloy solution-treated at 950 ℃ , and some net-liked 8 phase precipitates discontinuously under directly aging treatment. The precipitation of 8 phase significantly influences the grain size of the alloy and toughness and ductility of Inconel 718 alloy depend on the morphology and quantity of 8 phase. The morphological characteristics of γ＂, γ＇ phases and grain size of Inconel 718 alloy greatly affect its strength.
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