Net-Shape Forming and Mechanical Properties of MIM418 Turbine Wheel
Net-Shape Forming and Mechanical Properties of MIM418 Turbine Wheel
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DOI：
10.1007/s11665-016-2150-0
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发表时间：
2016-07
影响因子：
2.3
通讯作者：
Lin Zhang;Xiaowei Chen;Dan Li;Qu Xuanhui;Qin Mingli;Zhou Li
中科院分区：
文献类型：
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作者：
Lin Zhang;Xiaowei Chen;Dan Li;Qu Xuanhui;Qin Mingli;Zhou Li
采用带侧抽芯机构的模具，实现了中空内部结构涡轮轮毂的近净成形。采用真空烧结和热等静压相结合的方法获得了相对密度在99.5%以上的MIM418涡轮轮毂。在γ基质中形成了高体积分数(57%)的近立方体γ‘相，平均颗粒尺寸为0.52ngNdV·m。晶界和晶内均匀分布着尺寸为0.2~0.4umμm的少量离散碳化物。MIM418高温合金的抗拉强度、屈服强度和塑性分别达到1425、1004和19.4%，远高于铸造K418高温合金。
Near-net shape forming of the turbine wheel with a hollow internal structure was realized by adopting the die with side core-pulling mechanism. MIM418 turbine wheel with relative density above 99.5% is obtained by the combination of vacuum sintering and hot isostatic pressing. A high volume fraction (57%) of near cuboidal γ′ phase with average particle size of 0.52 μm is formed in γ matrix. Small amount of discrete carbides with size of 0.2-0.4 μm is distributed uniformly on grain boundaries and within grains. The tensile strength, yield strength, and ductility of MIM418 superalloy reach 1425 MPa, 1004 MPa, and 19.4%, respectively, which are much higher than that of the cast K418 superalloy.