Abstract
Hot deformation behavior of powder metallurgical high tungsten alloy steel was investigated by Gleeble thermal simulator in a temperature range of 900~1100℃ and a strain rate range of 0.001~1 s-1. The results show that the flow stress decreases with the decrease of strain rate and the increase of deformation temperature. A constitutive equation is derived with Arrhenius hyperbolic sine function, and a processing map is constructed. The activation energy is 377 kJ/mol. The suitable processing regions are 1000~1100℃/ 0.001~0.01 s-1. The precipitation of tungsten-rich μ phase occurs during hot deformation process. Microvoids and micro-cracks form in the bulging region of the specimen. The amount of microvoid increases with the increase of strain rate and the decrease of temperature. The μ phase precipitation improves the high temperature strength of the steel.
| Translated title of the contribution | 粉末冶金高钨合金钢热变形行为与加工图 |
|---|---|
| Original language | English |
| Pages (from-to) | 4201-4208 |
| Number of pages | 8 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 50 |
| Issue number | 12 |
| Publication status | Published - Dec 2021 |
Keywords
- Constitutive model
- Hot deformation behavior
- Microstructure
- Processing map
- Tungsten steel