Effect of Freckle Defects on Hot Deformation Behavior and Dynamic Recrystallization Structure Inheritance of an Iron–Nickel-Based Superalloy
Lianjie Zhang, Xiaojia Wang, Yuhan Wang, Lei Wang, Ran Duan, Shuo Huang, Guohua Xu, Yang Liu
TL;DR
This study examines how freckle defects affect the hot deformation and recrystallization behavior of an iron-nickel-based superalloy.
Contribution
The paper reveals how freckle defects alter dynamic recrystallization mechanisms in GH4706 alloy during hot deformation.
Findings
Freckle-containing specimens show lower DRX degree and larger grain size compared to freckle-free ones.
Freckle defects promote both DDRX and CDRX, while freckle-free specimens mainly show DDRX and PSN.
MC carbides and Laves phases in freckles act as nucleation sites for PSN.
Abstract
To study the influence of freckle defects on the hot deformation behavior and the inheritance of dynamic recrystallization (DRX) structure in GH4706 alloy, the microstructures of specimens with and without freckles and the evolution laws of hot-processing parameters were compared. Hot compression experiments were conducted on a thermal simulation testing machine at 950–1150 °C, strain rates of 0.001–1 s−1, and 55% deformation. Freckle-containing specimens were tested under DRX critical conditions. The flow stresses of both specimens increase with strain rate or with decreasing temperature. The power dissipation coefficient (η) and instability value (ξ) follow complex laws. Electron back-scattering diffraction (EBSD) was used to analyze DRX microstructures and nucleation mechanisms. The DRX degree of freckle-containing specimens is lower, with a larger average grain size. The DRX…
Genes, proteins, chemicals, diseases, species, mutations and cell lines named across the full text — each resolved to its canonical identifier and authoritative record.
Click any figure to enlarge with its caption.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsMetallurgy and Material Forming · Microstructure and mechanical properties · Solidification and crystal growth phenomena