Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

doi:10.1007/s40195-018-0779-4

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (3): 381-390.DOI: 10.1007/s40195-018-0779-4

所属专题： 2018-2019高温合金专辑

收稿日期:2018-03-27 修回日期:2018-05-28 出版日期:2019-03-10 发布日期:2019-02-22
作者简介:

Huan Liu is a Lecturer, Master’s Supervisor, College of Mechanics and Materials, Hohai University. He earned his Ph.D. from Southeast University in 2014 and then became a Lecturer in Hohai University. He was selected into the “Shuangchuang Program of Jiangsu Province” and “Dayu Scholars Program of Hohai University” in 2017. So far, he has published more than 30 scientific papers (indexed by SCI) and held 2 authorized Chinese patents. His papers were cited more than 200 times. His research interests mainly include design of high-strength and high ductility magnesium alloys, heat-resistant magnesium alloys, fabrication of fine-grained and ultra-fine-grained metallic materials, and biomedical materials.

Xian-Hua Chen is a Professor of Chongqing University and received his Doctor’s degree from Institute of Metal Research, Chinese Academy of Sciences in 2008. He is Director of Institute of Functional Mg Alloys in National Engineering Research Centre for Magnesium Alloys, Director of International Joint Laboratory for Light Alloys (Ministry of Education), Editorial Board of Acta Metallurgica Sinica (English Letters) (SCI). His research work is focused on new high-performance structural and functional magnesium alloys, and purification technology of magnesium alloys. He also worked in Materials Technology Laboratory of CANMET in Canada as visiting scientist during 2012-2013. He has 22 patents, 1 book and more than 60 SCI papers, including 2 science papers. His papers were cited more than 2700 times. He was awarded the Provincial and Ministerial S&T Prize in 2013, 2014 and 2017. He was the Chairman of “The 2nd China Youth Scholars Conference on Mg Alloys.”

Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

Liu Liu^1,², Jie Meng²(), Jin-Lai Liu², Hai-Feng Zhang^1,³, Xu-Dong Sun¹, Yi-Zhou Zhou²

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2018-03-27 Revised:2018-05-28 Online:2019-03-10 Published:2019-02-22

摘要/Abstract

Abstract:

The influence of crystal orientations on the low-cycle fatigue (LCF) behavior of a 3Re-bearing Ni-based single-crystal superalloy at 980 °C has been investigated. It is found that the orientation dependence of the fatigue life not only depends on the elastic modulus, but also the number of active slip planes and the plasticity of materials determine the LCF life, especially for the [011] and [111] specimens. The [011] and [111] specimens with better plasticity withstand relatively concentrated inelastic deformation caused by fewer active slip planes, compared to the [001] specimens resisting widespread deformation caused by a higher number of active slip planes. Additionally, fatigue fracture is also influenced by cyclic plastic deformation mechanisms of the alloy with crystal orientations, and the [001] specimens are plastically deformed by wave slip mechanism and fracture along the non-crystallographic plane, while the [011] and [111] specimens are plastically deformed by planar slip mechanism and fracture along the crystallographic planes. Moreover, casting pores, eutectics, inclusions and surface oxide layers not only initiate the crack, but also reduce the stress concentration around crack tips. Our results throw light upon the effect of inelastic strain on the LCF life and analyze the cyclic plastic deformation for the alloy with different orientations.

Key words: Single-crystal superalloy, Low-cycle fatigue, Anisotropy, Fracture behavior

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 381-390.

Liu Liu, Jie Meng, Jin-Lai Liu, Hai-Feng Zhang, Xu-Dong Sun, Yi-Zhou Zhou. Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 381-390.

图/表 14

Table 1 Nominal composition of the alloy (wt%)

Elements	C	Cr	Mo	Co	W	Ta	Al	Hf	Re	Ni
Composition	0.07	7	1.5	7.8	5	6.6	6	0.15	3.0	Bal.

Fig. 1 Relationship between the fatigue life and the strain range of experimental alloy at 980 °C: a total strain range versus fatigue life of various oriented alloy, b-d total, elastic and plastic strain ranges versus the number of cycles to failure of the alloy with the [001], [011] and [111] orientations, respectively

Fig. 2 Relationship between the fatigue life and the strain range of the experimental [001], [011] and [111] alloy at 980 °C: a normalized elastic strain range versus the number of cycles, b inelastic strain range versus the number of cycles

Fig. 3 SEM images of fatigue fracture of the [001] specimens after LCF at 980 °C: a-d ?εt/2 = 0.8%, e-h ?εt/2 = 0.45%: a, e macroscopical fracture morphology, b, f high magnification of the yellow boxes in a and e indicating the crack initiation site, c, g surface oxidation cracks, d, h high magnification of the blue dashed boxes in a and e showing striations in the area of crack propagation

Fig. 4 Schematic of the octahedral slip planes of the [001] specimens

Fig. 5 SEM images of fatigue fracture of the [011] specimens after LCF at 980 °C: a-d ?εt/2 = 0.8%, e-h ?εt/2 = 0.25%: a, e macroscopical fracture morphology, b, f, g surface slip morphologies, c the microporosity crack, d high magnification of the blue dashed box in a showing striations and secondary cracks, h surface oxidation crack

Fig. 6 Schematic of the octahedral slip planes of the [011] specimens

Fig. 7 SEM images of fatigue fracture of the [111] specimens after LCF at 980 °C: a-c ?εt/2 = 1.0%, d-f ?εt/2 = 0.2%: a, d macroscopical fracture morphology, b, e crack initiation site, c surface oxidation crack, f slip bands

Fig. 8 Schematic of the octahedral slip planes of the [111] specimens

Fig. 9 Morphologies of secondary cracks on the longitudinal sections of the [001] specimens after LCF at 980 °C: a forked and kinked cracks, b crystallographic secondary crack, c slip bands and partial crack closure of the crack tip (high magnification of the yellow dashed box in b), d slip bands of the crack tip (high magnification of the green dashed box in b)

Fig. 10 Morphologies of secondary cracks on the longitudinal sections of the [011] specimens after LCF at 980 °C: a secondary crack deflection at interdendritic carbides and eutectics, b the secondary crack accompanied by γ and γ′ phases distortion and slip bands, c different directions of slip bands (high magnification of the yellow dashed box in b)

Fig. 11 Morphologies of secondary cracks on the longitudinal sections of the [111] specimens after LCF at 980 °C: a secondary crack generated at the junction of different slip planes, b crack propagation path altered by carbides (high magnification of the blue dashed box in a), c crack-penetrating carbides (high magnification of the purple box in a)

Fig. 12 Schematic illustration of the crack initiation and propagation

Table 2 Tensile properties of experimental alloy with different orientations at 980 °C

Orientations	σ0.2σ0.2 (MPa)	σbσb (MPa)	Elongation (%)	Reduction in area (%)	Elastic modulus (GPa)
[001]	792	850	23.5	40	97
[011]	575	620	29	46	175
[111]	575	625	40	43	234

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Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

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