Effect of cooling rate and resulting microstructure on tensile properties and deformation mechanisms of an advanced PM nickel-based superalloy
Effect of cooling rate and resulting microstructure on tensile properties and deformation mechanisms of an advanced PM nickel-based superalloy
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冷却速率和所得显微组织对先进粉末冶金镍基高温合金拉伸性能和变形机制的影响
DOI：
10.1016/j.jallcom.2019.07.221
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发表时间：
2019-10
影响因子：
6.2
通讯作者：
Hu Benfu
中科院分区：
文献类型：
--
作者：
Huang Hailiang;Liu Guoquan;Wang Hao;Wang Zhicheng;Zhang Hongfei;Shao Yinlong;Hu Benfu
对粉末冶金镍基高温合金FGH98进行固溶处理，然后以3种不同的冷却速率进行冷却，研究了冷却速率对合金750 °C下组织和拉伸性能的影响。结果表明，随着冷却速度的降低，二次γ ′析出相的平均尺寸增大，形貌由近长方体状变为蝴蝶状。随着γ′相尺寸的增大，合金的局部滑移现象越来越难以发生，塑性也随之提高。结果表明，层错剪切和微孪晶分别是细小和粗大γ′相FGH98合金750 °C拉伸变形的主要机制。γ′相尺寸的增大促进了SF剪切机制向微孪晶机制的转变。
The powder metallurgy (PM) nickel-based superalloy FGH98 was subjected to solution treatment followed by cooling at three different rates, and the effects of the cooling rate on the microstructure and tensile properties of the alloy at 750 °C were investigated. The results show that as the cooling rate decreases, the average size of secondary γ′ precipitates increases, and the morphology of the secondary γ′ precipitates changes from a near-cuboidal shape to a butterfly shape. As the size of the γ′ precipitates increases, the localized slip occurs more difficultly resulting in improved plasticity. It is found that stacking fault (SF) shearing and microtwinning are the dominant mechanisms of 750 °C tensile deformation for the FGH98 alloy with fine and coarse γ′ precipitates respectively. The increase of γ′ precipitates size is suggested to promote the mechanism transition from SF shearing to microtwinning.
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