|
|
Elemental Partitioning Characteristics of Equilibrium Phases in Inconel 718 Alloy at 600-1100 �� |
WEI Xian-ping1,2,ZHENG Wen-jie2,SONG Zhi-gang2,LEI Ting1,YONG Qi-long2,XIE Qing-cheng3 |
1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Yunnan, China 2. Central Iron and Steel Research Institute, Beijing 100081, China 3. No. 704 Institute of China Shipbuilding Industry Corporation, Shanghai 200031, China |
|
|
Abstract The optimization of heat treatment and chemical composition for Inconel 718 alloy has been investigated uninterruptedly because of its excellent mechanical properties and metallurgical workability. The species, chemical compositions and content of equilibrium phases of Inconel 718 alloy in the temperature range of 600-1100 �� were calculated by using thermodynamic software ��Thermo-Calc�� and the latest relevant datebase of Ni-base superalloys. A concept of elemental partitioning fraction was used to study the partitioning characteristics of alloying elements in each equilibrium phase at different temperatures, such as Ni, Cr, Fe, Nb, Mo, Al, Ti and C, and some calculation results were confirmed under a scanning transmission electron microscope (STEM). The results showed that the elemental partitioning characteristics with the change of temperature revealed the selective partitioning characteristic of alloying elements in equilibrium phases at different temperatures, such as Nb was mainly distributed in �� and �á� phase, C in carbides, Al and Ti in �á� phase and Cr, Mo in Laves phase. At the same time, the effect of the change of component and quantity for each precipitated phase on matrix phase can be helpfully understood, which provided a theoretic foundation to optimize the chemical composition and heat treatment in different environments for Inconel 718 alloy.
|
Received: 11 January 2012
Published: 18 June 2013
|
Corresponding Authors:
WEI Xianping
E-mail: weixp316@163.com
|
|
|
|
[1] |
Jia-long Tian,,Wei Wang,,Wei Yan,,Zhou-hua Jiang,Yi-yin Shan,,Ke Yang. Microstructure characteristics of segregation zone in 17-4PH stainless steel piston rod[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 718-723. |
[2] |
ZHU Lai-bin��LIANG Jian-xiong��YU yao-hua��LU Lun. Thermodynamic calculation of equilibrium phases in Custom 450 stainless steel[J]. Chinese Journal of Iron and Steel, 2017, 42(1): 20-24. |
[3] |
FENG Han��JIAO Shao-yang��SONG Zhi-gang. Dynamics simulation and experimental measurement of the chromium depletion in nickel base alloy[J]. Chinese Journal of Iron and Steel, 2016, 28(11): 63-68. |
[4] |
Hui-xiang YU,,Xin-hua WANG,Jing ZHANG,Wan-jun WANG. Characteristics and Metallurgical Effects of Medium Basicity Refining Slag on Low Melting Temperature Inclusions[J]. Chinese Journal of Iron and Steel, 2015, 22(7): 573-581. |
[5] |
ZHANG Ze-cheng��ZHAO Cheng-zhi��ZHANG He-xin��YAN Tao��DING Chao��LI Wei. Effect of aluminum content on ��-ferrite content and impact properties of heat resistant steel[J]. Chinese Journal of Iron and Steel, 2015, 50(6): 69-74. |
[6] |
Yi-zhi LIU,Cai-fu YANG,Feng CHAI,Tao PAN,Hang SU. High Temperature Oxidation Resistance of 9Ni Steel[J]. Chinese Journal of Iron and Steel, 2014, 21(10): 956-963. |
|
|
|
|