Microstructure Stability of a Nickel Based Single Crystal Superalloy

SHI Zhen-xue; LIU Shi-zhong; LI Jia-rong

Materials and Mechanical Engineering > 2013 > 37(11): 82-86.

SHI Zhen-xue, LIU Shi-zhong, LI Jia-rong. Microstructure Stability of a Nickel Based Single Crystal Superalloy[J]. Materials and Mechanical Engineering, 2013, 37(11): 82-86.

Citation:

SHI Zhen-xue, LIU Shi-zhong, LI Jia-rong. Microstructure Stability of a Nickel Based Single Crystal Superalloy[J]. Materials and Mechanical Engineering, 2013, 37(11): 82-86.

Citation:

SHI Zhen-xue, LIU Shi-zhong, LI Jia-rong. Microstructure Stability of a Nickel Based Single Crystal Superalloy[J]. Materials and Mechanical Engineering, 2013, 37(11): 82-86.

PDF (3113 KB)

Microstructure Stability of a Nickel Based Single Crystal Superalloy

More Information

Received Date: August 23, 2013

Graphical Abstract

Abstract

Abstract

A Nickel based single crystal superalloy was prepared by screw selecting method in vacuum directionally solidified furnace. The microstructure and its stability were investigated by SEM and TEM after the alloy experienced standard heat treatment and then was aged for 200, 400, 600, 800 h at 1 070 ℃. The results show that the regular and cube γ′ phases were obtained after fully heat treatment of the alloy. The γ′ coarsening and the γ matrix channel broadening with time were observed in the long term aging at 1 070 ℃. The full γ′ rafting formed after long term aging for 800 h. No TCP phase precipited after long term aging for 200 h. Needle shaped TCP phase precipitated on dendritic crystals in the alloy after long term aging for 400 h. With aging time extension, the precipitated TCP phase increased and grew up from dendritic crystal region to interdendritic region. The TCP phase was mainly composed of Re, W, Mo and Co and so on. TCP phase was identified as σ phase, which precipitated and grew along fixed direction, [001] σ//[112]γ , (11-0)σ//(22-0)γ。
- single crystal superalloy,
- microstructure stability,
- long term aging,
- TCP phase

FullText(HTML)

References (14)

References

[1]	WALSTON W S, O′HARA K, ROSS E W, et al. RenéN6: Third generation single crystal superalloy[C]//Superalloys 1996. Warrendale: TMS, 1996: 27-34..
[2]	ERICKSON G L. The development and application of CMSX-10[C]//Superalloys 1996. Warrendale: TMS, 1996: 35-44.
[3]	ACHARYA M V, FUCHS G E. The effect of long term thermal exposures on the microstructure and properties of CMSX-10 single crystal superalloys[J].Materials Science and Engineering: A, 2004, 381: 143-153.
[4]	SATO A, HARADA H, YOKOKAWA T, et al. The effect of ruthenium on the phase stability of fourth generation Ni-base single crystal superalloys[J].Scripta Materialia, 2006, 54: 1679-1684.
[5]	YEH A C, TIN S. Effect of Ru on the high temperature phase stability of Ni-base single crystal superalloys[J].Metallurgical and Materials Transactions: A, 2006, 37: 2621-2631.
[6]	任英磊, 金涛, 管恒荣, 等.高温长期时效对镍基单晶高温合金γ′相形貌的影响[J].机械工程材料, 2004, 28(3): 10-12.
[7]	AGHAIE-KHAFRI M, HAJJAVADY M. The effect of thermal exposure on the properties of a Ni-base superalloy [J].Materials Science and Engineering: A, 2008, 487: 388-393.
[8]	HOBBS R A, ZHANG L, RAE C M F, et al. The effect of ruthenium on the intermediate to high temperature creep response of high refractory content single crystal suepralloy[J].Materials Science and Engineering: A, 2008, 489: 65-76.
[9]	LIFSHITZ M, SLYOZOV V V. The kinetics of precipitation from supersaturated solid solution[J].J Phys Chem Solids, 1961, 19: 35-50.
[10]	夏鹏成, 禹文芳, 于金江, 等.长期时效对DZ951合金γ′相的影响[J].材料工程, 2007(12): 8-11.
[11]	SHARGHI-MOSHATGHIN R, ASGARI S. The effect of thermal exposure on the γ′ characteristics in a Ni-base superalloy[J].Journal of Alloys and Compounds, 2004, 368: 144-151.
[12]	马文有, 李树索, 乔敏, 等.热处理对镍基单晶高温合金微观组织和高温持久性能的影响[J].中国有色金属学报, 2006, 16(6): 937-944.
[13]	NEUMEIER S, PYCZAK F, GKEN M. The influence of Ruthenium and Rhenium on the local properties of the γ- and γ′-phase in Nickel-base superalloys and their consequences for alloy behavior[C]//Superalloys 2008. Pennsylvania: TMS, 2008: 109-119.
[14]	RAE C M F, KARUNARATNE M S A, SMALL C J, et al, Topologically close packed phases in an experimental Rhenium-containing single crystal superalloy[C]//Superalloys 2000. Warrendale: TMS, 2000: 767-776.

Cited By

Get Citation

PDF

XML

Article views (3) PDF downloads (0)

Turn off MathJax

Article Contents

Abstract

References

Microstructure Stability of a Nickel Based Single Crystal Superalloy

Abstract

References

Catalog

Export File

Citation

Format

Content