Effect of high temperature aging on microstructures and tensile properties of a selective laser melted GTD222 superalloy
Effect of high temperature aging on microstructures and tensile properties of a selective laser melted GTD222 superalloy
复制标题
高温时效对选区激光熔化GTD222高温合金显微组织和拉伸性能的影响
DOI：
10.1016/j.jallcom.2020.157226
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发表时间：
2021-02-05
影响因子：
6.2
通讯作者：
Sun, Baode
中科院分区：
文献类型：
--
作者：
Wang, Rui;Zhu, Guoliang;Sun, Baode
GTD 222是一种重要的高温热端结构合金。在这项工作中，高温（800-950摄氏度）时效处理的GTD 222高温合金的显微组织演变和机械性能的选择性激光熔化（SLM）加工的影响进行了研究。经不同的高温时效处理后，得到了不同形貌和尺寸的γ ′-Ni_3（Al，Ti）相。当时效温度低于850 ℃时，在时效样品中析出大量非常小的球形γ '相和粗糙的片状γ'相。球形γ '相均匀分布在合金中，而片状γ'相沿着胞边界分布。随着时效温度的升高，γ '相明显粗化，屈服强度降低。当时效温度为850 ~ 900 ℃时，强度和塑性达到最佳平衡。(C)2020 Elsevier B. V.保留所有权利。
GTD222 is an important structural alloy that is applied as a high-temperature hot-end part. In this work, the effect of a high-temperature (800-950 degrees C) aging treatment on the microstructural evolution and mechanical performance of a GTD222 superalloy fabricated with selective laser melting (SLM) processed is investigated. Precipitates of gamma'-Ni3(Al, Ti) with different morphologies and sizes are obtained after different high-temperature aging treatment processes. When the aging temperature is below 850 degrees C, a large number of very small spherical gamma' phases and coarse plate like gamma' are precipitated in the aged samples. The spherical gamma' precipitates are homogeneously distributed in the alloy, while the plate-like gamma' precipitates are distributed along the boundaries of the cells. With increasing aging temperature, the gamma' precipitates are significantly coarsened, and the yield strength (YS) decreases. The strength and ductility reach the best balance herein when the aging temperature ranges from 850 degrees C to 900 degrees C. (C) 2020 Elsevier B.V. All rights reserved.