Effect of heat treatment on the microstructures and hardness of selective laser melted Rene88DT superalloy

Q3 Engineering International Journal of Computational Materials Science and Surface Engineering Pub Date : 2020-01-01 DOI:10.1504/IJCMSSE.2020.10034959

Jian Liu, Yu Yan, Qin Peng, Y. Lei

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Abstract

Selective laser melted Rene88DT specimens with columnar grains (specimen C) and near-equiaxed grains (specimen E) were fabricated, on which solution-aging and direct aging treatments were applied, respectively. The evolution of microstructures and hardness of both specimens was investigated. Results show that specimen C showed columnar grains with aspect ratio of 3.6 and 5% difference in hardness between vertical and horizontal directions, while specimen E with near-equiaxed grains (aspect ratio of 1-2) was isotropic. The as-deposited alloys consisted of γ-matrix, carbides and Laves phases. After solution-aging treatment, equiaxed grains (56 μm) with annealing twins, blocky μ phases (1 μm) and dispersively distributed γ′ (40 nm) were observed in specimen C. After direct aging treatment, rod-like γ′ phases with 40 nm in length and 15 nm in diameter were precipitated in specimen E. Specimen E showed higher hardness than specimen C because of stronger grain boundary strengthening, substructure strengthening and second-phase strengthening.

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热处理对选择性激光熔化Rene88DT高温合金组织和硬度的影响

制备了具有柱状晶粒(C)和近等轴晶粒(E)的选择性激光熔化Rene88DT试样，分别进行了固溶时效和直接时效处理。研究了两种试样的显微组织和硬度的演变。结果表明:C试样为柱状晶粒，长径比为3.6，纵横方向硬度差为5%;E试样为近等轴晶粒，长径比为1-2，各向同性;沉积合金主要由γ-基体、碳化物和Laves相组成。固溶时效处理后，试样C中析出具有退火孪晶的等轴晶(56 μm)、块状μ相(1 μm)和分散分布的γ′(40 nm)。直接时效处理后，试样E中析出长40 nm、直径15 nm的棒状γ′相，由于晶界强化、亚结构强化和第二相强化较强，试样E的硬度高于试样C。

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来源期刊

International Journal of Computational Materials Science and Surface Engineering Engineering-Engineering (all)

CiteScore

1.20

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0.00%

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期刊介绍： IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.