Revealing the creep-fatigue deformation mechanism for a directionally-solidified Ni-based superalloy DZ445 at 900 °C

Published on Jul 11, 2018
· DOI :10.1088/2053-1591/AAD078
Biao Ding3
Estimated H-index: 3
,
Weili Ren18
Estimated H-index: 18
+ 4 AuthorsZ. M. Ren3
Estimated H-index: 3
Source
Abstract
📖 Papers frequently viewed together
4 Citations
2 Citations
References49
Newest
#1Biao DingH-Index: 1
#1Biao Ding (SHU: Shanghai University)H-Index: 3
Last. Yongchun Liang (EPRI: Electric Power Research Institute)H-Index: 1
view all 5 authors...
4 CitationsSource
#1Yuling Tang (NCEM: National Center for Electron Microscopy)H-Index: 1
#2Ming Huang (Nanjing University of Science and Technology)H-Index: 1
Last. Jing Zhu (NCEM: National Center for Electron Microscopy)H-Index: 31
view all 5 authors...
Abstract A second-generation nickel-based single crystal superalloys DD6 were creep tested in the [001] direction (within 15°) at 1100 °C/140 MPa. The specimen tested until rupture was investigated using scanning and transmission electron microscopy to determine the evolution of the dislocation behaviors during tertiary creep. It was found that the tertiary creep deformation was highly localized and inhomogeneous along the gauge length, and the types of superdislocations in γ′ rafts varied with ...
36 CitationsSource
#1Fraaz Tahir (ASU: Arizona State University)H-Index: 3
#2Sonam Dahire (ASU: Arizona State University)H-Index: 2
Last. Yongming Liu (ASU: Arizona State University)H-Index: 31
view all 3 authors...
Abstract Alloy 617 is a primary candidate material to be used in the next generation of nuclear power plants. Structural materials for these plants are expected to undergo creep and fatigue at temperatures as high as 950 °C. This study uses a hybrid-control creep-fatigue loading profile, as opposed to the traditional strain-controlled loading, to generate creep dominated failure. Qualitative and quantitative image analysis through SEM, EDS, and EBSD, is used to show that hybrid control testing i...
12 CitationsSource
#1Yuzhou Wang (USTB: University of Science and Technology Beijing)H-Index: 1
#2Jianxin Dong (USTB: University of Science and Technology Beijing)H-Index: 18
Last. Zhihao Yao (USTB: University of Science and Technology Beijing)H-Index: 13
view all 4 authors...
Abstract The relaxation properties of AEREX350 and Waspaloy were studied contrastively at temperatures ranging from 600 °C to 800 °C with the same initial stress 510 MPa. The relationship between the microstructure and relaxation properties was elucidated using scanning and transmission electron microscopy techniques. It was found that the relaxation limit and relaxation stability of the two alloys decreased obviously with the increase of temperature, but the relaxation stability of AEREX350 dec...
14 CitationsSource
#1Sisi Xiang (Beijing University of Technology)H-Index: 8
#2Shengcheng Mao (Beijing University of Technology)H-Index: 17
Last. Xiaodong Han (Beijing University of Technology)H-Index: 64
view all 11 authors...
Abstract Two distinct evolutionary processes of secondary γ′ precipitates in a Ni-based single crystal superalloy were revealed by means of Cs-corrected high-resolution transmission electron microscopy (HRTEM) and corresponding X-ray energy dispersive spectroscopy analyses. Upon creep testing at elevated temperatures, it was determined that large quantities of secondary γ′ precipitates were formed. The precipitates were found to select two distinctive forms and routes: one randomly dispersed in ...
25 CitationsSource
#1Masaya Deguchi (UTokyo: University of Tokyo)H-Index: 1
#2Hirobumi Tobe (JAXA: Japan Aerospace Exploration Agency)H-Index: 7
Last. Eiichi Sato (JAXA: Japan Aerospace Exploration Agency)H-Index: 19
view all 3 authors...
Abstract This paper describes a characteristic damage propagation mechanism in low-cycle creep–fatigue of Cu–0.7Cr–0.09Zr (mass%), as investigated by creep–fatigue tests including strain controlled fatigue and stress-holding type creep, and following microstructural observations by scanning electron microscopy (SEM). The total stress-holding time until rupture in the creep–fatigue test was shorter than one-tenth of the rupture life in the simple creep test, and the rupture life of the specimen i...
7 CitationsSource
#1Mau Sheng Chiou (ISU: I-Shou University)H-Index: 4
#2Sheng-Rui Jian (ISU: I-Shou University)H-Index: 28
Last. Jenh-Yih Juang (NCTU: National Chiao Tung University)H-Index: 26
view all 5 authors...
Abstract This study explores the effects of cooling rate after solution heat treatment on the high temperature/low stress (982 °C/200 MPa) creep properties of CM-247LC Nickel base superalloy. Cooling rate was controlled by blowing argon gas, air cooling, and furnace cooling, which, in turn, gave rise to corresponding cooling rates (from 1260 °C to 800 °C) of 18.7, 7.4, and 0.19 °C/s, respectively. The results indicated that higher cooling rate from the solution heat treatment temperature led to ...
18 CitationsSource
#1Motoki SakaguchiH-Index: 5
#2阪口基己H-Index: 1
Last. 井上裕嗣H-Index: 1
view all 8 authors...
4 CitationsSource
#1In Soo KimH-Index: 11
#2Baig-Gyu ChoiH-Index: 5
Last. C.Y. JoH-Index: 1
view all 5 authors...
Abstract Low cycle fatigue behaviors of two cast Ni-base superalloys have been investigated. Effects of microstructure of a solution hardened alloy and a precipitation strengthened alloy on cyclic stress responses were studied at various temperatures and strain ranges. In the case of a solution hardened alloy, Hastelloy X, fatigue lives at lower temperatures are longer than those at higher temperatures regardless of total strain range. IN738LC which is strengthened by γ′ particles is founded to ...
20 CitationsSource
#1Alireza B. Parsa (RUB: Ruhr University Bochum)H-Index: 11
#2Philip Wollgramm (RUB: Ruhr University Bochum)H-Index: 10
Last. Gunther Eggeler (RUB: Ruhr University Bochum)H-Index: 67
view all 7 authors...
Abstract In the present work we study the formation of grooves and ledges (typical size: γ / γ ′ interfaces of single crystal Ni-base superalloys. We highlight previous work which documents the presence of such interface irregularities and shows that their number and size increases during high temperature exposure and creep. We use diffraction contrast stereo transmission electron microscopy (TEM) to provide new evidence for the presence of ledges and grooves near dislocations at γ / γ ′ interfa...
28 CitationsSource
Cited By2
Newest
#1Zhen Wang (THU: Tsinghua University)H-Index: 2
#2Wenwang Wu (SJTU: Shanghai Jiao Tong University)H-Index: 1
Last. Xide Li (THU: Tsinghua University)H-Index: 5
view all 4 authors...
Abstract Creep-fatigue interaction behavior of nickel-based single crystal superalloy was studied in an in-situ SEM platform at 900 °C. Dwell times of 15, 30, 60, 90, 120 s were introduced at the tensile peak stress of each cycle. Experimental results showed that the life cycles firstly decreased rapidly then slightly increased with the increasing dwell time, which was explained by the accumulated inelastic strain. Dislocation microstructure and inelastic strain were correlated for different dwe...
2 CitationsSource
#1Biao Ding (SHU: Shanghai University)H-Index: 3
#2Weili Ren (SHU: Shanghai University)H-Index: 18
Last. Yunbo Zhong (SHU: Shanghai University)H-Index: 20
view all 8 authors...
Abstract Based on the tensile stress-dominated (strain ratio, R = e min / e max = 0 ) and compressive stress-dominated (R = ∞) low-cycle fatigue (LCF) of a first-generation directionally solidified Ni-based superalloy DZ445 at 900 °C, the paper investigated the contribution of tensile stress and compressive stress to the damage during LCF and creep-fatigue deformation. The results demonstrated that the fatigue life in the case of tensile stress-dominated LCF is about half of that in compressive ...
2 CitationsSource