Effect of quenching transfer time on microstructure and mechanical properties of oil-quenched FGH4095 superalloys
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摘要: 采用不同淬火转移时间对热等静压+挤压+等温锻造工艺制备的FGH4095合金进行固溶淬火处理，并对处理后的合金进行显微组织分析与力学性能测试。结果表明，淬火转移时间对合金的晶粒组织、一次γ′相和三次γ′相的影响不大，但会影响二次γ′相的尺寸分布。淬火转移时间30 s的FGH4095合金二次γ′相的平均尺寸为142.9 nm，淬火转移时间40 s的FGH4095合金二次γ′相的平均尺寸为161 nm。淬火转移时间越短，合金的淬火冷速越快，析出的二次γ′相平均尺寸越细小。淬火转移时间30 s的FGH4095合金室温屈服强度优于淬火转移时间40 s的FGH4095合金，室温抗拉强度二者相近；淬火转移时间30 s的FGH4095合金的650 ℃屈服强度、抗拉强度、持久寿命以及持久塑性均高于淬火转移时间40 s的FGH4095合金。淬火转移时间越短，合金中二次γ′相的数量越多，尺寸越小，阻碍位错运动的临界剪切应力越高，使得合金的拉伸强度更高，持久寿命更长。Abstract: The FGH4095 superalloys prepared by hot isostatic pressing + extrusion + isothermal forging were quenched with the different quenching transfer time, and the microstructure and mechanical properties of the treated superalloys were analyzed. The results show that, the quenching transfer time has little effect on the grain size, primary γ′ phase, and tertiary γ′ phase of the FGH4095 superalloys, but influences the size distribution of the secondary γ′ phase. The average size of the secondary γ′ phase with the quenching transfer time of 30 s is 142.9 nm, and that of the secondary γ′ phase is 161 nm with the quenching transfer time of 40 s. The shorter the quenching transfer time, the faster the quenching cooling rate of the FGH4095 superalloys, and the smaller the average size of the secondary γ′ phase. The yield strength of the FGH4095 superalloys at room temperature with the quenching transfer time of 30 s is better than that of FGH4095 superalloys with quenching transfer time of 40 s, and the tensile strength at room temperature is similar to that of FGH4095 superalloys with quenching transfer time of 40 s. The yield strength, tensile strength, endurance life, and endurance ductility of the FGH4095 alloys with the quenching transfer time of 30 s at 650 ℃ are higher than those of the FGH4095 superalloys with the quenching transfer time of 40 s. The shorter the quenching transfer time, the greater the number of the secondary γ′ phase, the smaller the size, the higher critical shear stress impeding the dislocation movement, the higher the tensile strength and the longer the endurance life of the FGH4095 superalloys.
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图 1 不同工艺FGH4095合金晶粒组织：（a）挤压+锻造（淬火转移时间30 s）；（b）挤压+锻造（淬火转移时间40 s）；（c）直接热等静压成形
Figure 1. Grain structure of the FGH4095 superalloys produced by the different processes: (a) extrusion+forging (quenching transfer time 30 s); (b) extrusion+forging (quenching transfer time 40 s); (c) hot isostatic pressing
图 2 不同淬火转移时间FGH4095合金γ′相形貌：（a）、（b）30 s；（c）、（d）40 s
Figure 2. γ′ phase morphology of the FGH4095 superalloys for the different quenching transfer time: (a), (b) 30 s; (c), (d) 40 s
图 3 不同淬火转移时间FGH4095合金γ′相尺寸分布：（a）一次γ′相；（b）二次γ′相；（c）三次γ′相
Figure 3. γ′ phase size distribution of the FGH4095 superalloys for the different quenching transfer time: (a) primary γ′ phase; (b) secondary γ′ phase; (c) tertiary γ′ phase
图 4 不同淬火转移时间FGH4095合金的拉伸性能：（a）、（b）室温；（c）、（d）650 ℃
Figure 4. Tensile properties of the FGH4095 superalloys for the different quenching transfer time: (a), (b) room temperature; (c), (d) 650 ℃
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