INFLUENCE OF W AND Co ON HIGH TEMPERATURE CREEP BEHAVIOUR OF Ni-20Cr BASE ALLOYS
Yang Nansen; Wei Yuhuan; Fu Hongzhen and Zt Wengao (Central Institute of Iron and Steel Research; Ministry of Metallurgical Industry) and Tang Rongde (Pushun Steel Works)
Cite this article:
Yang Nansen; Wei Yuhuan; Fu Hongzhen and Zt Wengao (Central Institute of Iron and Steel Research; Ministry of Metallurgical Industry) and Tang Rongde (Pushun Steel Works). INFLUENCE OF W AND Co ON HIGH TEMPERATURE CREEP BEHAVIOUR OF Ni-20Cr BASE ALLOYS. Acta Metall Sin, 1981, 17(1): 44-49.
Abstract The steady state creep behaviour of the Ni-20Cr base alloys with various contents of W and Co has been investigated in the temperature range of 940 to 1040℃. Both W and Co may raise the activation energy for creep, Qo, obeyed the relationship:Q_c=Ae~(kx/lg~(?)) where x is the atomic fraction of W or Co additions; A is a constant for the alloy composition and k is equal to 7.0 and 0.55 for W and Co additions respectively. The steady state creep rate (?)_s of Ni-Cr-Co-W alloys was predicated to be:(?)_s=Cσ~m exp (-Q_e/RT) where m=6.45±0.10 or 5.3 depending on whether μ phase is present or not. It was also shown that the (?)_s varies with the stacking fault energy γ according to the correlation:(?)_s∞γ~(1.4)
