Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636261 | Transactions of Nonferrous Metals Society of China | 2016 | 11 Pages |
Abstract
Effects of initial δ phase (Ni3Nb) on the hot tensile deformation behaviors and material constants of a Ni-based superalloy were investigated over wide ranges of strain rate and deformation temperature. It is found that the true stress-true strain curves exhibit peak stress at a small strain, and the peak stress increases with the increase of initial δ phase. After the peak stress, initial δ phase promotes the dynamic softening behaviors, resulting in the decreased flow stress. An improved Arrhenius constitutive model is proposed to consider the synthetical effects of initial δ phase, deformation temperature, strain rate, and strain on hot deformation behaviors. In the improved model, material constants are expressed as the functions of the content of initial δ phase and strain. A good agreement between the predicted and measured results indicates that the improved Arrhenius constitutive model can well describe hot deformation behaviors of the studied Ni-based superalloy.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Yong-cheng LIN, Min HE, Ming-song CHEN, Dong-xu WEN, Jian CHEN,