Journal Published Online: 29 May 2019
Volume 8, Issue 5

Hot Working Flow Behavior of Ti-6242S Alloy

CODEN: MPCACD

Abstract

The hot working behavior of Ti-6242S alloy was investigated over a range of temperatures and strain rates (973–1,373 K and 10−3–1 s−1, respectively). The flow behavior was dominated by dynamic recovery and flow softening at temperatures above and below 1,223 K, respectively. Processing maps were constructed from the flow curves at a true strain of 0.5 over the temperature ranges 973–1,223 K and 1,223–1,373 K. In each temperature regime, we compared the flow localization parameter and temperature sensitivity with the instability parameter determined from the processing map. The processing conditions were optimized in the temperature range 1,173–1,273 K and strain rate ranges of 5.0 × 10−1–1.0 s−1 and (1.0–5.0) × 10−3 s−1. The deformation activation energy under a strain rate of 10−3 s−1 was determined as ∼360 kJ/mol and was further reduced when considering the threshold stress. The operating deformation mechanism in the 973–1,223 K regime was dislocation climb creep. The microstructural evolution was examined by optical and scanning electron microscopies and was correlated with the stable and unstable regimes of the processing map.

Author Information

Gangolu, Srinu
Department of Mechanical Engineering, National Institute of Technology Calicut, Calicut, Kerala, India
Kitashima, Tomonori
Research Center for Structural Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
Hagiwara, Masuo
Research Center for Structural Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
Emura, Satoshi
Research Center for Structural Materials, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
Iida, Kazuhiko
Materials Manufacturing and Engineering Station, National Institute for Materials Science, Tsukuba, Ibaraki, Japan
Pages: 14
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: MPC20180156
ISSN: 2379-1365
DOI: 10.1520/MPC20180156