Experimental investigation on microcrack initiation process in nickel-based superalloy DAGH4169
Source abstract
Abstract
Abstract An experimental investigation of the microcrack initiation process at 400 °C in nickel-based superalloy with direct aging, DAGH4169, is described. The fatigue tests were carried out using a mini servo-hydraulic fatigue machine in a scanning electronic microscope (SEM) chamber. The entire process of crack initiation (including microcrack nucleation, propagation and coalescence) and macrocrack formation was observed. It is found that the propagation behaviors of cracks nucleated at inclusions (Type I cracks) and in slip bands (Type II cracks) are quite different. According to observations from field emission scanning electron microscopy, crack closure caused by Ti(C, N) debris in cracking gaps is believed to be responsible for the low propagation rate of Type I cracks. A three-stage simulation model for the crack initiation process is proposed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · High Temperature Alloys and Creep · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (14)
Show source-provided references
1. Brückner-Foit A, Huang X, Motoyashiki Y. Mesoscopic simulation of damage accumulation under fatigue loading. In: The 15th European conference of fracture, advanced fracture mechanics for life and safety assessments; 2004. p. 1–6.
2. A stochastic simulation model for micro-crack initiation in a martensitic steel10.1016/S0927-0256(02)00409-3 ↗
3. The influence of temperature on low cycle fatigue behavior of nickel base superalloy GH404910.1016/S0142-1123(99)00041-9 ↗
4. Short crack initiation and growth at 600°C in notched specimens of Inconel71810.1016/S0921-5093(02)00169-7 ↗
5. Alexandre F, Piques R, Deyber S, Pineau A. High temperature creep-fatigue crack initiation in 718-DA Ni based superalloy. In: The 14th biennial conference on fracture, fracture mechanics beyond 2000; 2002. p. 31–7.
6. Modelling the optimum grain size on the low cycle fatigue life of a Ni based superalloy in the presence of two possible crack initiation sites10.1016/j.scriptamat.2003.09.043 ↗
7. Bhowal PR, Wusatowska-Sarnek AM. Carbides and their influence on notched low cycle fatigue behavior of fine grained IN718 gas turbine disk material. In: Loria EA, editor. Proceedings of the sixth international symposium on superalloys 718, 625, 706 and derivatives 2005. The minerals, metals & materials society. October 2–5, 2005. p. 341–9.10.7449/2005/Superalloys_2005_341_349 ↗
8. In-situ SEM study of fatigue crack growth behaviour in IN71810.1016/S0142-1123(03)00172-5 ↗
9. Boehlert CJ, Li H, Wang L, Bartha B. Slip system characterization of Inconel 718 using in-situ scanning electron microscopy. In: Advanced materials & processes; November–December 2010. p. 41–5.
10. In: China aeronautical materials handbook, vol. II. China Standard Press; 2002 [in Chinese].
11. ASTM Standard, E466. “Standard practice for conducting force controlled constant amplitude axial fatigue tests of metallic materials”. West Conshohocken, PA: ASTM International; 2007. doi:10.1520/E0466-07. .10.1520/E0466-07 ↗
12. Fatigue crack growth resistant microstructures in polycrystalline Ni-base superalloys for aeroengines10.1016/S0142-1123(98)00087-5 ↗
13. ASTM Standard, E647. “Standard test method for measurement of fatigue crack growth rates”. West Conshohocken, PA: ASTM International; 2008. doi:10.1520/E0647-00. .10.1520/E0647-00 ↗
14. A dislocation model for fatigue crack initiation10.1115/1.3157599 ↗