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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 2/2018

19-01-2018

Effects of Strain Rate on Tensile Deformation and Fracture Behavior of Directionally Solidified Superalloy DZ125L

Authors: Taosha Liang, Lei Wang, Yang Liu, Xiu Song

Published in: Journal of Materials Engineering and Performance | Issue 2/2018

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Abstract

The tensile deformation and fracture behavior of directionally solidified superalloy DZ125L were studied with a strain rate ranging from 10−3 to 7 × 102 s−1 at room temperature. Results show that the strength of DZ125L alloy presents positive strain rate sensitivity in tested strain rate range which is mainly resulted from the increasing accumulation of dislocations in the matrix. The ductility of the alloy first increases and then it remains insensitive with the increase in strain rates. The enhancement of ductility is primarily due to the increasing amount of broken MC carbides and plastic deformation in the matrix at higher strain rates. The strain rates influence the amount of broken MC carbides and then affect the deformation behavior of the alloy. Based on observations and discussions of the lateral microstructures and dislocations, it is concluded that the MC carbides with sizes larger than 10 μm are easy broken in the early deformation stage and act as crack sources during the proceeding plastic deformation. The growth and connection of microcracks and the propagation of main crack lead to the fracture of the matrix.
previous article Effect of Zr Content on Mechanical Properties of Diamond/Cu-Zr Composites Produced by Gas Pressure Infiltration
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Metadata
Title
Effects of Strain Rate on Tensile Deformation and Fracture Behavior of Directionally Solidified Superalloy DZ125L
Authors
Taosha Liang
Lei Wang
Yang Liu
Xiu Song
Publication date
19-01-2018
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 2/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-017-3084-x

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