Effect of Microstructures and Defects on Dynamic Compression and Shear Performance of Laser Metal—Deposited GH4169 Superalloy
Publication: Journal of Aerospace Engineering
Volume 33, Issue 3
Abstract
This work evaluated the effect of the unique microstructures and defects on the dynamic mechanical behavior of laser metal–deposited (LMD) GH4169. The compression and shear properties were tested at strain rates ranging from 0.001 to . The difference in dynamic properties between the LMD and forged GH4169 was estimated by a comparative study of their dynamic compressive response at different temperatures. The initial microstructures and fractured characteristics were observed using a scanning electron microscope. The results showed that both the compressive and shear strength exhibit significant strain-rate sensitivity. The microstructural anisotropy leads to different compressive strengths depending on loading direction. However, the anisotropy of shear properties is not obvious, resulting from the narrow deformation area of shear specimen. Owing to the coarse columnar grains in the LMD GH4169 sample, the compressive strength of the LMD sample was lower than that of the forged sample. The crack and fractography morphology showed that Laves phases and defects in the LMD samples could be sensitive points for deformation and fracture under dynamic loading.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This research work was supported by the National Natural Science Foundation of China (Nos. 11572261, 11872051, and 11372255) and the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (No. CX201822).
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Published In
Journal of Aerospace Engineering
Volume 33 • Issue 3 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 28, 2019
Accepted: Oct 21, 2019
Published online: Feb 26, 2020
Published in print: May 1, 2020
Discussion open until: Jul 26, 2020
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