Study on the microstructure of superalloy GH4065A solidified under high pressure

Li Jing; Shui Lang; Zhou Yang; Zhang Shucai

doi:10.7513/j.issn.1004-7638.2021.05.026

Volume 42 Issue 5

Oct. 2021

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2021 > 42(5): 170-174

Li Jing, Shui Lang, Zhou Yang, Zhang Shucai. Study on the microstructure of superalloy GH4065A solidified under high pressure[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 170-174. doi: 10.7513/j.issn.1004-7638.2021.05.026

Citation:

Li Jing, Shui Lang, Zhou Yang, Zhang Shucai. Study on the microstructure of superalloy GH4065A solidified under high pressure[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 170-174. doi: 10.7513/j.issn.1004-7638.2021.05.026

Citation:

PDF( 759 KB)

Study on the microstructure of superalloy GH4065A solidified under high pressure

doi: 10.7513/j.issn.1004-7638.2021.05.026

Li Jing^{1, 2
,},
Shui Lang^{1, 2},
Zhou Yang^{1, 2},
Zhang Shucai³

1.
Chengdu Insititute of Advanced Metallic Material Technolgy and Industry Co.，Ltd., Chengdu 610300, Sichuan, China
2.
State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan 114009, Liaoning, China
3.
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China

Received Date: 2021-06-21
Publish Date: 2021-10-30

Abstract

Abstract

OM and SEM were used to observe the microstructure of GH4065A under two solidification modes: normal pressure and pressure (under 2 MPa) to analyze the effect of high pressure on the structure. The results show that the as-cast GH4065A structure under normal pressure has a large number of loose shrinkage cavities, the main precipitated phase in the microstructure is γ' phase, and the most severely segregated element is Nb. Solidification at 2 MPa can eliminate a large number of loose shrinkage cavities, increase the density of castings, and greatly reduce the residual segregation index of Nb element. At the same time, the pressure solidification can make the secondary dendrite spacing of alloy GH4065A lower than that of the normal pressure ingot. This is because the pressure increases the phase transition temperature, thereby increasing the phase transition driving force of the melt and refining the crystal grains. These results demonstrate that the great advantages and application prospects of pressurized solidification in superalloys, and it can be extended to other superalloy grades in order to exert the important value of pressurized solidification.
- superalloy,
- pressurized solidification,
- microstructure,
- segregation characteristics

FullText(HTML)

References(14)

References

[1]	Stefanescu D M. Science and engineering of casting solidification[M]. New York: Kluwer Academic/Plenum Publishers, 2002.
[2]	Han Bo, Wu Sujun. Microstructural evolution of high manganese steel solidified under superhigh pressure[J]. Materials Letters, 2011:70(1):7-10.
[3]	朱红春, 姜周华, 李花兵, 等. 加压技术在高品质特殊钢冶炼和凝固中的作用[J]. 钢铁, 2015, 50(11): 37-44. Zhu Hongchun, Jiang Zhouhua, Li Huabing, et al. Effect of pressurization technology on steel-making and solidification of high-grade special steels[J]. Iron and Steel, 2015, 50(11): 37-44.
[4]	Wang Meng, Zeng Jianmin, Huang Weidong. Adjusted pressure casting technique for precision casting of large-scale complicated & thin-wall components[J]. Foundry Technology, 2004,(5):353−358. (王猛, 曾建民, 黄卫东. 大型复杂薄壁铸件高品质高精度调压铸造技术[J]. 铸造技术, 2004,(5):353−358. doi: 10.3969/j.issn.1000-8365.2004.05.015
[5]	He Shuxian, Liu Yahui, Wang Jun, et al. Research progress of metals and alloys pressurized solidification[J]. Foundry Technology, 2017,38(6):1253−1257. (何树先, 刘雅辉, 王俊, 等. 金属与合金加压凝固研究进展[J]. 铸造技术, 2017,38(6):1253−1257.
[6]	Ghanti S B. The effects of solidification under pressure on properties of cast aluminum alloys[D]. Alabama: The University of Alabama at Birmingham, 2011.
[7]	Zhao Guangpu, Huang Shuo, Zhang Beijiang, et al. Microstructure control and mechanical properties of the newest nickel-based wrought superalloy GH4065A[J]. Journal of Iron and Steel Research, 2015,27(2):37−44. (赵光普, 黄烁, 张北江, 等. 新一代镍基变形高温合金GH4065A的组织控制与力学性能[J]. 钢铁研究学报, 2015,27(2):37−44.
[8]	Batyshev K A. Casting of aluminum alloys with pressure crystal lization. Part 2[J]. Met Sci Heat Treat, 2012,54:55−62. doi: 10.1007/s11041-012-9454-y
[9]	苏志权, 孟照亮, 孙昌建. 真空增压铸造技术及其应用前景[J]. 特种铸造及有色合金, 2003(5): 38-40. Su Zhiquan, Meng Zhaoliang, Sun Changjian. Vacuum pressurized casting technology and its application prospects[J]. Special Casting & Nonferrous Alloys, 2003(5): 38-40.
[10]	Huang Shuo, Zhang Beijiang, Tian Qiang, et al. Isothermal and static oxidation behavior of superalloy GH4065A[J]. Journal of Iron and Steel Research, 2016,28(7):55−60. (黄烁, 张北江, 田强, 等. 高温合金GH4065A的恒温静态氧化行为[J]. 钢铁研究学报, 2016,28(7):55−60.
[11]	Zhang Beijiang, Zhao Guangpu, Zhang Wenyun, et al. Investigation of high performance disc alloy GH4065 and associated advanced processing techniques[J]. Acta Metallurgica Sinica, 2015,51(10):1227−1234. (张北江, 赵光普, 张文云, 等. 高性能涡轮盘材料GH4065及其先进制备技术研究[J]. 金属学报, 2015,51(10):1227−1234.
[12]	Tomasz Wojcik, Markus Rath, Ernst Kozeschnik. Characterisation of secondary phases in Ni-base superalloy Rene 65[J]. Materials Science and Technology, 2018, 34(13).
[13]	Wang Zixing, Huang Shuo, Zhang Beijiang, et al. Study on freckle of a high-alloyed GH4065 nickel base wrought superalloy[J]. Acta Metallurgica Sinica, 2019,55(3):417−426. (王资兴, 黄烁, 张北江, 等. 高合金化GH4065镍基变形高温合金点状偏析研究[J]. 金属学报, 2019,55(3):417−426.
[14]	Sosenushkin E N, Frantsuzova L S, Kozlova E M. Effect of pressure and temperature factors on the solidification of cast iron and its structure in liquid forging[J]. Metal Science & Heat Treatment, 2015.