熱處理對連續點式鍛壓激光快速成形GH4169合金組織與拉伸性能的影響

熱處理對連續點式鍛壓激光快速成形GH4169合金組織與拉伸性能的影響Effect of Heat Treatment on Microstructure and Mechanical Properties of Consecutive Point-Mode Forging and Laser Rapid Forming GH4169 Alloy

研究了熱處理對連續點式鍛壓激光快速成形GH4169合金顯微組織和拉伸性能的影響。結果表明,980STA熱處理未能使連續點式鍛壓激光快速成形GH4169合金發生再結晶,合金的拉伸性能達不到鍛件標準。經1020STA熱處理后,合金發生完全再結晶,等軸晶晶粒尺寸分布均勻,平均晶粒尺寸約為12.8 μm,Laves相未被完全固溶,合金的強度和塑性超過鍛件標準。1050STA熱處理合金的再結晶平均晶粒尺寸約為25.3 μm,Laves相完全固溶消失,與1020STA熱處理合金相比,合金的強度下降而塑性上升,強度和塑性超過鍛件標準。經1080STA熱處理后,合金再結晶晶粒尺寸分布不均勻程度明顯增大,平均晶粒尺寸約為123.6 μm,與1020STA和1050STA熱處理合金相比,合金的強度和塑性都大幅度下降,僅與鍛件標準相當。

To transform the columnar grain in the as-deposited GH4169 alloy to the exquiaxed grain and get better mechanical properties, a block sample of GH4169 alloy has been formed by using a technology of consecutive point-mode forging and laser rapid forming (CPF-LRF). During the process of CPF-LRF, GH4169 alloy was deposited by laser rapid forming firstly and then the deposited GH4169 alloy was deformed by consecutive point-mode forging. Both consecutive point-mode forging and laser rapid forming were alternately carried out until the completion of the forming of an objective part. The effects of heat treatment on the microstructures and mechanical properties of CPF-LRF GH4169 alloy have been investigated. The result shows that 980STA heat treatment fails to lead to recrystallization of CPF-LRF GH4169 alloy, and the tensile properties of 980STAed CPF-LRF GH4169 alloy can't meet the wrought standards. After the 1020STA heat treatment, the average recrystal grain size of GH4169 alloy is about 12.8 μm, and Laves phase can not be dissolved completely. The tensile properties of the 1020STAed CPF-LRF GH4169 alloy is superior to the wrought standards. Compared to the 1020STAed CPF-LRF GH4169 alloy, the tensile strength of 1050STAed CPF-LRF GH4169 alloy drops and its ductility increases due to complete dissolution of Laves phase and grain size increasing to 25.3 μm. The average grain size of the 1080STAed CPF-LRF GH4169 alloy is about 123.6 μm. Compared to 1020STAed and 1050STAed CPF-LRF GH4169, the tensile properties of 1080STAed CPF-LRF GH4169 has fallen substantially, which just satisfy the wrought standards.

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