The low-cycle fatigue and fatigue-crack-growth behavior of HAYNES® HR-120 alloy

Chen, L. J.; Liaw, Peter K.; McDaniels, R.L.; Klarstrom, D. L.

doi:10.1007/s11661-003-0257-z

Cited by 12 publications

(7 citation statements)

References 57 publications

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“…[20][21][22][23][24][25] The DSA can be considered to be due to the solute drag exerted on mobile dislocations by B and C atoms. Evidence of the solute drag during cyclic deformation in alloy 800H has been reported by Villagrana et al [20] An alternative mechanism of DSA has been proposed by Mulford and Kocks, [21] which was referred to as the dislocation-dislocation interaction model.…”

Section: B Serrated Flow Behavior and Dynamic Strain Agingmentioning

confidence: 99%

“…[21] The DSA increased the strain localization in the planar slip bands, and the impingement of these bands on grain boundaries, caused internal grain boundary cracks, and reduced fatigue life. [22,23,24] The mechanism of serrated deformation of IN718 alloy was studied by Chen and Chaturvedi. [25] They observed that the serrated flow in this alloy was due to the interaction of dislocations with precipitates.…”

Section: B Serrated Flow Behavior and Dynamic Strain Agingmentioning

confidence: 99%

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Effect of boron on the low-cycle fatigue behavior and deformation structure of INCONEL 718 at 650 °C

Xiao

Chaturvedi

Chen

2004

Metall Mater Trans A

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Symmetrical push-pull low-cycle fatigue (LCF) tests were performed on INCONEL 718 (IN718) containing 12, 29, 60, and 100 ppm B at 650 °C. The results showed that all the alloys experienced a relatively short period of initial cyclic hardening at low strain amplitudes, followed by a regime of saturation or slightly continuous cyclic softening. The initial cyclic hardening phase decreased with increasing strain amplitudes, and disappeared at the high strain amplitudes. A serrated flow was observed in the plastic regions of cyclic stress-strain hysteresis loops. The saturated cyclic stress amplitude at a given strain amplitude was highest for the alloy with 60 ppm B, and lowest for the alloy with 12 ppm B. The LCF lifetime increased with increasing B concentration up to 60 ppm, and then decreased as the B content increased from 60 to 100 ppm. Fractographic analysis suggested that the fracture mode changed from intergranular to transgranular cracking as the B concentration increased. The characteristic deformation microstructures produced by LCF tests at 650 °C, examined via transmission electron microscopy, were regularly spaced arrays of planar deformation bands on {111} slip planes in all four alloys. A ladderlike structure was observed in some local regions in the alloy with 12 ppm B. Heavily deformed planar deformation bands were observed in the fatigued specimens with 100 ppm B. The mechanism of improvement in the LCF life of IN718 due to B addition is discussed.

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Section: B Serrated Flow Behavior and Dynamic Strain Agingmentioning

confidence: 99%

Section: B Serrated Flow Behavior and Dynamic Strain Agingmentioning

confidence: 99%

Effect of boron on the low-cycle fatigue behavior and deformation structure of INCONEL 718 at 650 °C

Xiao

Chaturvedi

Chen

2004

Metall Mater Trans A

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“…13,14 Work on the low cycle fatigue of this alloy reports the occurrence of similar precipitates, although the research was carried out at lower temperatures. 15 Figures 8 and 9 show that the specimens treated for extended periods of time at 1120uC exhibit the highest tensile strength, which can be attributed to the high strain rate hardening that characterises single phase austenitic alloys. 16 Figure 10 shows that the material fulfils the resistance to fracture requirements at high temperature, but it shows the tendency to fracture towards shorter times in the specimen immersed in water as the that contribute in strengthening grain boundaries dissolve.…”

Section: Resultsmentioning

confidence: 98%

Heat treating of a ring rolled Ni–Fe–Cr superalloy

Covarrubias¹,

Elizarrarás²,

K³

et al. 2012

Materials Science and Technology

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Haynes HR-120 alloy (UNS N08120) is a nickel–iron–chromium alloy that exhibits high strength at elevated temperature and resistance to carburising and sulphidising environments. These properties make this alloy suitable for the production of components of land based turbines, including rings. Manufacture and heat treating of such rings require strict control of the processing variables, such as temperature and deformation ratios, as well as the time and temperature of the solution treatment, due to their effect on microstructure and mechanical properties. It is common practice to treat this alloy at temperatures above 1100°C to promote dissolution of undesired particles and recrystallisation of deformed structures, but it has been found that grain coarsening can occur during treatment. The present work presents the results of a series of solution heat treatments that were performed within a broad range of temperatures on industrial ring rolled pieces. It was found that the increment in time and temperature enhances the dissolution of intergranular precipitates that result in the improvement of mechanical properties, but grain coarsening is observed to occur when the material is treated for long times and high temperatures. The best combination of mechanical properties and grain size was obtained by treating the material for half an hour at 1050°C.

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“…Crack length was measured by the crack-opening-displacement gauge using the unloadingcompliance method. [23,24] In a FCG test, data is recorded using a computer data-acquisition system and then plotted as crack length a vs the total number of elapsed cycles N. The crack growth rate da/dN is taken as the slope at some point of the curve, and it is a function of the stress level, crack size, and material properties. Mathematically, this crack propagation rate may be expressed in terms of the stress intensity factor, K [11] as follows:…”

Section: ½1mentioning

confidence: 99%

Hydride-Phase Formation and its Influence on Fatigue Crack Propagation Behavior in a Zircaloy-4 Alloy

Garlea

Choo

Wang

et al. 2010

Metall Mater Trans A

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The hydride-phase formation and its influence on the fatigue behavior of a Zircaloy-4 alloy charged with hydrogen gas are investigated. First, the microstructure and fatigue crack propagation rate of the alloy in the as-received condition are studied. Second, the formation and homogeneous distribution of the delta zirconium hydride in the bulk and its effect on the fatigue crack propagation rate are presented. The results show that in the presence of hydrides, the zirconium alloy exhibits reduced toughness and enhanced crack growth rates. Finally, the influence of a preexisting fatigue crack in the specimen and the subsequent hydride formation are examined. The residual lattice strain profile around the fatigue crack tip is measured using neutron diffraction. It is observed that the combined effects of residual strains and hydride precipitation on the fatigue behavior are more severe leading to propagation of the crack under near threshold loading.

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The low-cycle fatigue and fatigue-crack-growth behavior of HAYNES® HR-120 alloy

Cited by 12 publications

References 57 publications

Effect of boron on the low-cycle fatigue behavior and deformation structure of INCONEL 718 at 650 °C

Effect of boron on the low-cycle fatigue behavior and deformation structure of INCONEL 718 at 650 °C

Heat treating of a ring rolled Ni–Fe–Cr superalloy

Hydride-Phase Formation and its Influence on Fatigue Crack Propagation Behavior in a Zircaloy-4 Alloy

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