Effect of W on Deformation Resistance of Co-Bearing 12Cr Ferrite Heat-Resistant Steel for USC Steam Turbines
| Periodical | Materials Science Forum (Volume 650) |
|---|---|
| Main Theme | Energy and Environment Materials |
| Edited by | Yafang Han, Tianmin Wang and Shaoxiong Zhou |
| Pages | 199-204 |
| DOI | 10.4028/www.scientific.net/MSF.650.199 |
| Citation | Hui Ran Cui et al., 2010, Materials Science Forum, 650, 199 |
| Online since | May, 2010 |
| Authors | Hui Ran Cui, Feng Sun, Lan Ting Zhang, Ai Dang Shan, Jian Sheng Wu |
| Keywords | 12Cr Ferritic Heat Resistant Steel, Apparent Activation Energy, Deformation Resistance, Ultra Supercritical Steam Turbine, W |
| Price | US$ 28,- |
12Cr heat resistant steels with different concentration of Co and W, while Mo equivalent (Mo+1/2W) was fixed at 1.6, were prepared by arc-melting and hot rolling. Mechanical properties were evaluated by tensile tests conducted with the strain rate 2×10-5S-1 at 575oC, 600oC and 625oC instead of time-consuming creep tests. The results show that when Co content is fixed, the steel with 1.5 wt% W is found having the best deformation resistance which is strong work hardening and slow strain softening. Apparent activation energy of the steel with 3.1 wt% Co and 1.5 wt% W is in the range of 370~413 kJ/mol, higher than those of the other steels in our study, which are close to the self-diffusion activation energy of iron (239 kJ/mol). Therefore, the steel with 3.1 % Co and 1.5% W is suggested as a potential candidate material for 625oC~650oC class USC steam turbines.
