Hot deformation behavior and flow stress modeling of a Ni-based superalloy

Detrois, Martin; Antonov, Stoichko; Tin, Sammy; Jablonski, Paul D.; Hawk, Jeffrey A.

doi:10.1016/j.matchar.2019.109915

Hot deformation behavior and flow stress modeling of a Ni-based superalloy

Journal Article · Wed Sep 04 00:00:00 EDT 2019 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2019.109915· OSTI ID:1607765

Detrois, Martin ^[1]; Antonov, Stoichko ^[2]; Tin, Sammy ^[3]; Jablonski, Paul D. ^[4]; Hawk, Jeffrey A. ^[4]

National Energy Technology Lab. (NETL), Albany, OR (United States); Leidos Research Support Team, Albany, OR (United States)
Univ. of Science and Technology Beijing (China); Illinois Inst. of Technology, Chicago, IL (United States)
Illinois Inst. of Technology, Chicago, IL (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)

The deformation behavior of a novel Ni-based superalloy was investigated using isothermal compression on a Gleeble system at temperatures between 1050 and 1210 °C with strain rates between 0.001 and 0.1 s^–1. Flow-stress curves and electron backscatter diffraction maps were employed to experimentally identify the various flow mechanisms operative during deformation. Deformation at temperatures below 1130 °C presented strong work hardening with limited restoration during dynamic softening leading to partially recrystallized microstructures. Increasing the deformation temperature to and above 1130°C enhanced the driving force for dislocation and grain boundary mobility thereby enabling dynamic recovery (DRV) and dynamic recrystallization (DRX) mechanisms to better operate. Here, the influence of the strain rate was more evident during deformation at these temperatures. Increasing the strain rate from 0.001 s^–1 to 0.1 s^–1 resulted in a transition in dominant softening mechanism from DRV to DRX. Flow stress modeling using the Zener-Hollomon parameter was performed to obtain the activation energy and the constitutive equation for hot deformation of the alloy. Strong changes in flow behavior affected the accuracy of the flow stress model, and thus, the model was used alternatively to identify deformation parameters associated with various flow regimes. In doing so, the activation energy and the other equation constants were obtained for each deformation mechanism observed experimentally.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: China Postdoctoral Science Foundation; National Natural Science Foundation of China; USDOE

OSTI ID:: 1607765

Alternate ID(s):: OSTI ID: 1564495

Journal Information:: Materials Characterization, Journal Name: Materials Characterization Journal Issue: C Vol. 157; ISSN 1044-5803

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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