Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5468019 | Vacuum | 2017 | 22 Pages |
Abstract
The effects of solutionizing cooling processing (the interrupted water-cooling and direct water-cooling) on the number and size distribution of γⳠ(Ni3Nb) phase, as well as work hardening characteristics during hot tensile deformation, of a Ni-Fe-Cr-base superalloy are investigated. It is found that γⳠphase and work hardening characteristics are sensitive to the solutionizing cooling processing. For the superalloy treated by the interrupted water-cooling, the size and number of γⳠphase significantly decrease with raising the interrupted temperature (Tin). The strain hardening exponent rapidly increases when Tin are higher than 705 °C. When Tin are below 755 °C, the tensile curves exhibit parabolic shape, showing a typical work hardening-dynamic recovery behavior. With the increase of true plastic strain (εp), the work hardening rate (θ=dÏ/dε) firstly increases and then decreases after elastic-plastic transient stage. However, when Tin are higher than 755 °C, flow stress linearly increases, and the obvious linear hardening occurs. The value of θ remains almost constant with the further increase of true plastic strain (εp) after elastic-plastic transient stage. In addition, the flow characteristics of the superalloy treated by the direct water-cooling are similar to those of the superalloy treated by the interrupted water-cooling.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Y.C. Lin, Hui Yang, Ling Li,