Anisotropy of Stress Rupture Property of Ni Base Single Crystal Superalloy DD432

doi:10.11900/0412.1961.2022.00108

Acta Metall Sin

2023, Vol. 59

Issue (12): 1559-1567 DOI: 10.11900/0412.1961.2022.00108

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Anisotropy of Stress Rupture Property of Ni Base Single Crystal Superalloy DD432

ZHANG Zixuan¹^,², YU Jinjiang¹(

), LIU Jinlai¹

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

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ZHANG Zixuan, YU Jinjiang, LIU Jinlai. Anisotropy of Stress Rupture Property of Ni Base Single Crystal Superalloy DD432. Acta Metall Sin, 2023, 59(12): 1559-1567.

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Abstract

Ni base superalloys have been extensively used in advanced aeroengine. With the development of modern aviation industry, high demands are being placed on the comprehensive performance of Ni base superalloys at high temperatures. To meet this demand, numerous refractory alloy elements are added to Ni base superalloys. However, in this way, the temperature bearing capacity of the alloy is enhanced, while the microstructure stability is reduced. Therefore, some scholars proposed to develop single crystal blades with various orientations through the anisotropy of a single crystal alloy. The stress rupture anisotropies of a Ni base single crystal superalloy DD432 under 760^oC, 810 MPa and 1000^oC, 280 MPa have been investigated in this study. The stress rupture properties of Ni base single crystal superalloy DD432 that deviated from <001>, <011>, and <111> with certain degrees were measured. It is discovered that rafting does not occur in specimens with three orientations, and the stress rupture life anisotropy of specimens is visible at 760^oC and 810 MPa. Furthermore, the stress rupture life of specimens with <111> orientation is the best, and as the orientation deviation degree increases, the stress rupture life gradually decreases. The stress rupture property of specimens with <001> orientation is lower than that of specimens with <111> orientation, and the stress rupture life increases with increasing orientation deviation degree. The creep resistance of specimens with <011> orientation is the lowest, and the stress rupture property is also enhanced as the orientation deviation degree increases. Rafting occurred in all the specimens with three orientations under the conditions of 1000^oC and 280 MPa, and the stress rupture property anisotropy of specimens decreased, but still existed. The stress rupture property of specimens with <111> orientation was slightly better than that of specimens with <001> orientation, and the stress rupture property of specimens with <011> orientation was still the worst, although it improved. A difference still exists in the stress rupture life as the degree of orientation deviation changes. However, there is no visible linear tendency.

Key words: Ni base single crystal superalloy stress rupture property anisotropy

Received: 11 March 2022

ZTFLH:

TG113.25

Fund: National Natural Science Foundation of China(51971214)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00108 OR https://www.ams.org.cn/EN/Y2023/V59/I12/1559

Fig.1 Cross-sectional OM images of as-cast Ni base single crystal superalloy with <001> (a), <011> (b), and <111> (c) orientations

Fig.2 Statistical diagram of the change of stress rupture life with deviation of orientation under 760^oC and 810 MPa

Fig.3 Statistical diagram of the change of stress rupture life with deviation of orientation under 1000^oC and 280 MPa

Table 1 Tensile creep elongations of specimens with three orientations under 760^oC and 810 MPa

Table 2 Tensile creep elongations of specimens with three orientations under 1000^oC and 280 MPa

Fig.4 Tensile creep curves of <001>, <011>, and <111> oriented specimens under 760^oC and 810 MPa (a) and 1000^oC and 280 MPa (b) (Inset in Fig.4b is the magnification of initial creep curves)

Fig.5 Crack propagation at casting hole of stress rupture specimen under 1000^oC and 280 MPa

Fig.6 SEM images of <001> (a, b), <011> (c, d), and <111> (e, f) oriented specimens after creep rupture under 760^oC, 810 MPa (a, c, e) and 1000^oC, 280 MPa (b, d, f)

Fig.7 Low (a) and high (b) magnified SEM images of microcracks of <001> oriented specimens under 1000^oC and 280 MPa

Fig.8 TEM images of <011> (a, c) and <111> (b, d) oriented specimens after creep rupture under 760℃, 810 MPa (a, b) and 1000^oC, 280 MPa (c, d)

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