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Materials 2017, 10(2), 161; doi:10.3390/ma10020161

Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy

1,2,3
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1,2,3
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1,2,3,* and 1,2,3
1
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2
Powder Metallurgy Research Institute, Central South University, Changsha 410083, China
3
High Temperature Materials Research Institute, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Received: 11 January 2017 / Accepted: 8 February 2017 / Published: 10 February 2017
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Abstract

Controlling grain size in polycrystalline nickel base superalloy is vital for obtaining required mechanical properties. Typically, a uniform and fine grain size is required throughout forging process to realize the superplastic deformation. Strain amount occupied a dominant position in manipulating the dynamic recrystallization (DRX) process and regulating the grain size of the alloy during hot forging. In this article, the high-throughput double cone specimen was introduced to yield wide-range strain in a single sample. Continuous variations of effective strain ranging from 0.23 to 1.65 across the whole sample were achieved after reaching a height reduction of 70%. Grain size is measured to be decreased from the edge to the center of specimen with increase of effective strain. Small misorientation tended to generate near the grain boundaries, which was manifested as piled-up dislocation in micromechanics. After the dislocation density reached a critical value, DRX progress would be initiated at higher deformation region, leading to the refinement of grain size. During this process, the transformations from low angle grain boundaries (LAGBs) to high angle grain boundaries (HAGBs) and from subgrains to DRX grains are found to occur. After the accomplishment of DRX progress, the neonatal grains are presented as having similar orientation inside the grain boundary. View Full-Text
Keywords: nickel base superalloy; hot deformation; high-throughput experimental method; double cone; misorientation; grain size nickel base superalloy; hot deformation; high-throughput experimental method; double cone; misorientation; grain size
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

He, G.; Tan, L.; Liu, F.; Huang, L.; Huang, Z.; Jiang, L. Strain Amount Dependent Grain Size and Orientation Developments during Hot Compression of a Polycrystalline Nickel Based Superalloy. Materials 2017, 10, 161.

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