Microstructural Stability and Stress Rupture Properties of a Third-Generation Ni Base Single Crystal Supalloy

doi:10.11900/0412.1961.2022.00337

Acta Metall Sin

2024, Vol. 60

Issue (6): 770-776 DOI: 10.11900/0412.1961.2022.00337

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Microstructural Stability and Stress Rupture Properties of a Third-Generation Ni Base Single Crystal Supalloy

LIU Jinlai¹(

), SUN Jingxia¹^,², MENG Jie¹, LI Jinguo¹

1 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

LIU Jinlai, SUN Jingxia, MENG Jie, LI Jinguo. Microstructural Stability and Stress Rupture Properties of a Third-Generation Ni Base Single Crystal Supalloy. Acta Metall Sin, 2024, 60(6): 770-776.

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Abstract

Single-crystal superalloys have been developed to the 5th generation to improve their temperature capacity. Thus, a rare metal Ru is doped to the 4th and 5th generations based on the 6%Re (with the same mass fraction) contained in third-generation superalloys. Compared with Re addition in low-generation superalloys, improvement of temperature capacity decreases with Ru addition in high-generation superalloys; however, the cost of superalloys containing Ru has increased significantly. Therefore, considerable attention must be paid to the development of third-generation single-crystal superalloys because of their superior cost performance. Thus, considering the slight precipitation of the topologically close-packed (TCP) phase and low properties at the intermediate temperature of third-generation single-crystal superalloys, Al is considered as a significant element affecting microstructure stability, which is determined by calculating the number of electron vacancy (N_v). By reducing 0.4%Al, no TCP phase is precipitated in the superalloy after long-term thermal exposure at 1100^oC for 1000 h; therefore, good microstructure stability is obtained. The concentration of Re and Co is decreased slightly to increase the stacking fault energy of the superalloy and to enhance the properties at intermediate temperature. The stress rupture life at 760^oC and 800 MPa extends from 40 h to 150 h by reducing 0.4%Al followed with reduction of 0.25%Re and 1%Co. Moreover, the stress rupture properties at high temperature remain unchanged. Based on the abovementioned research, a third-generation single-crystal superalloy is developed, and the causes of stabilization of the microstructure and improvement to properties at intermediate temperature are also discussed.

Key words: third-generation single crystal superalloy microstructure stability stress rupture property Re deformation mechanism

Received: 09 July 2022

ZTFLH:

TG113.25

Fund: National Key Research and Development Program of China(2019-Ⅶ-0019-0161);National Key Research and Development Program of China(2017YFA0700704);National Natural Science Foundation of China(51971214);Sichuan Science and Technology Program(2022YFSY0016)

Corresponding Authors: LIU Jinlai, senior engineer, Tel: (024)23971767, E-mail: jlliu@imr.ac.cn

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	LIU Jinlai
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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00337 OR https://www.ams.org.cn/EN/Y2024/V60/I6/770

Fig.1 SEM images of single crystal superalloy with original composition after 1100^oC thermal exposure for 100 h (a) and 1000 h (b) (TCP—topologically close-packed)

Fig.2 Variation of number of electron vacancy (ΔN_v) with 0.1% reduction of each element

Table 1 Volume fractions of each constitutional phase in alloys with original composition and respective content reduction 0.4%Al and 0.4%Re

Fig.3 SEM-SE images of single crystal superalloy with 0.4% reduction of Al after 1100^oC thermal exposure for 100 h (a) and 1000 h (b)

Fig.4 Calculation results of stacking fault energies of single crystal superalloys with original and optimized compositions

Fig.5 Creep curves under 760^oC and 800 MPa of single crystal superalloys with original and optimized compositions

Fig.6 TEM images showing dislocation configurations of single crystal superalloys with original (a) and optimized (b) compositions crept at 760^oC and 800 MPa for 1 h (The incident beam along [001] orientation)

Fig.7 Relation between stress rupture lives and orientations under 760^oC and 800 MPa with optimized composition (Numbers denote the lives of corresponding dots in graph, the three arcs correspond to deviation angles 5°、10°, and 15°, respectively )

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