|
|
Effect of Cooling Rate on Microstructure and Mechanical Properties of K465 Superalloy |
PEI Zhong-ye, HAN Wei ,ZHAO Gang,CHEN Xing-fu,LI Jun-tao,TIAN Yan-wen |
|
|
Abstract K465 superalloy, as a material for production of turbine nozzle, shows high mechanical properties as well as microstructure stability in critical and severe service conditions. The alloy gains its appropriate microstructure and strength through solid solution strengthening mechanism. Heat treatment parameters such as: time and temperature of homogenization, partial solution and aging temperatures, and cooling rate from solid solution affect the microstructure of the alloy. Among these parameters cooling rate from solid solution is the most effective. Therefore, in this study the effect of cooling rate on microstructure and mechanical properties (tensile and stress properties) were investigated. For this purpose, three different cooling rates were applied on the cast K465 specimens after solution treatment at 1210�� for 4 h. Microstructures of the specimens then were studied using optical and electron microscopy. Also, tensile tests were performed at room temperature and stress rupture tests were performed under the condition of 975�� and 230 MPa. It was found out that with increasing cooling rate the size of the ��' precipitates decreases and the mechanical properties of specimens increases. Also, it was shown that the shape and volume fraction of primary ��' particles are largely influenced by the cooling rate following solution treatment at 1210�� for 4 h.
|
Received: 30 May 2008
|
|
|
|
[1] |
Ying Ci,*,Zhan-zhan Zhang. Simulation study on heat-affected zone of high-strain X80 pipeline steel[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 966-973. |
[2] |
Xiao-li Zhao,,Yong-jian Zhang,Cheng-wei Shao,Wei-jun Hui,Han Dong. Thermal stability of retained austenite and mechanical properties of medium-Mn steel during tempering treatment[J]. Chinese Journal of Iron and Steel, 2017, 24(8): 830-837. |
[3] |
Hang-wei Zhou,,Hui-qun Liu,,Dan-qing Yi,,Yu Xiao,,Xiao-long Zhao,Jian Wang,Qi Gao. Effect of �� phase on fatigue crack growth of Ti-6242 alloy[J]. Chinese Journal of Iron and Steel, 2017, 24(8): 811-822. |
[4] |
Reng-chong Xu,,Yan-lin He,,Hu Jiang,,Hua Wang,,Na-qiong Zhu,,Xiao-gang Lu,, Lin Li,. Microstructures and mechanical properties of ferrite-based lightweight steel with different compositions[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 737-742. |
[5] |
Zhu-jun Jiang,Yu-ye Wu,,Jing-min Wang,Cheng-bao Jiang. Influence of cooling rate on magneto-structural transition and magnetocaloric effect of Ni30Cu8Co12Mn37Ga13 alloy[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 711-717. |
[6] |
Wei-jun Hui,*,Na Xiao,Xiao-li Zhao,Yong-jian Zhang,Yu-feng Wu. Effect of vanadium on dynamic continuous cooling transformation behavior of medium-carbon forging steels[J]. Chinese Journal of Iron and Steel, 2017, 24(6): 641-648. |
|
|
|
|