Precipitation in the NiCu-base alloy monel K-500

Dey, G.K.; Mukhopadhyay, P.

doi:10.1016/0025-5416(86)90236-3

Cited by 29 publications

(23 citation statements)

References 19 publications

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“…This heat treatment should result in coherent-spherical Ni 3 Al precipitate strengthened (c¢ phase of order 5 nm radius, 8 to 10 vol pct, and possibly with dissolved Ti, Cu, Si, or Mn) Ni-Cu solid solution austenite (face-centered cubic c phase). [59] Ramberg-Osgood flow rule constants [60] were determined for this lot of aged Monel K-500 using compression loading to 2 pct total strain: a = 0.39, n = 20, E = 185,700 MPa, and r o = r YS (0.2 pct offset) = 786 MPa, consistent with Table II. Single edge micronotch tensile (SENT) specimens were machined with a width (W) of 10.7 mm and thickness (B) of 2.54 mm. [42] The Mode I loading axis was parallel to the longitudinal direction (L) of the rod, with crack growth in the radial (R) direction.…”

Section: A Materials and Specimen Designmentioning

confidence: 60%

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Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Gangloff

Burns

et al. 2014

Metall Mater Trans A

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Hydrogen environment-assisted cracking (HEAC) of Monel K-500 is quantified using slow-rising stress intensity loading with electrical potential monitoring of small crack propagation and elastoplastic J-integral analysis. For this loading, with concurrent crack tip plastic strain and H accumulation, aged Monel K-500 is susceptible to intergranular HEAC in NaCl solution when cathodically polarized at À800 mV SCE (E A , vs saturated calomel) and lower. Intergranular cracking is eliminated by reduced cathodic polarization more positive than À750 mV SCE . Crack tip diffusible H concentration rises, from near 0 wppm at E A of À765 mV SCE , with increasing cathodic polarization. This behavior is quantified by thermal desorption spectroscopy and barnacle cell measurements of hydrogen solubility vs overpotential for planar electrodes, plus measured-local crevice potential, and pH scaled to the crack tip. Using crack tip H concentration, excellent agreement is demonstrated between measurements and decohesion-based model predictions of the E A dependencies of threshold stress intensity and Stage II growth rate. A critical level of cathodic polarization must be exceeded for HEAC to occur in aged Monel K-500. The damaging-cathodic potential regime likely shifts more negative for quasi-static loading or increasing metallurgical resistance to HEAC.

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Section: A Materials and Specimen Designmentioning

confidence: 60%

“…These particles are sized (~50 nm diameter) on the scale of Ni 3 (Al,Ti) precipitates. [59] D. Effect of Applied Potential on HEAC…”

Section: Heac Under Severe Cathodic Polarizationmentioning

confidence: 99%

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Gangloff

Burns

et al. 2014

Metall Mater Trans A

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“…Monel K-500 is a precipitation-hardened, Ni-base alloy nominally comprised of a face-centered cubic (fcc) Ni-Cu solid solution (γ) matrix and a homogeneous distribution of highly coherent (< 0.1 pct misfit strain), intermetallic γ (Ni3(Al,Ti)) precipitates [44][45][46][47]. The γ precipitates have an ordered Ll 2 structure composed of Ni atoms at the faces and Al (or Ti) atoms on the corners of the unit cell [44,47]. Due to the low misfit and interfacial energy anisotropy between the γ and γ phases, the precipitates form as spherical particles [44].…”

Section: Methodsmentioning

confidence: 99%

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

et al. 2020

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The onset of sub-critical crack growth during slow strain rate tensile testing (SSRT) is assessed through a combined experimental and modeling approach. A systematic comparison of the extent of intergranular fracture and expected hydrogen ingress suggests that hydrogen diffusion alone is insufficient to explain the intergranular fracture depths observed after SSRT experiments in a Ni-Cu superalloy. Simulations of these experiments using a new phase field formulation indicate that crack initiation occurs as low as 40% of the time to failure. The implications of such sub-critical crack growth on the validity and interpretation of SSRT metrics are then explored.

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“…Therefore, under long term service at high temperature conditions, γ precipitations could change. It is observed that there is slight decrease on the hardness values of the K-500 alloy aged for 10 h and 12 h. This decreasing hardness of the alloy can be explained by the dimensional change in γ precipitations due to over-ageing [12][13][14].…”

Section: Microstructural Characterizationmentioning

confidence: 91%

“…In this alloy, γ precipitations can easily be obtained in structure through ageing process. Dey and Mukhopadhyay [12] reported that γ precipitations formed in the structure through ageing process exhibit very little or no change up to 700…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Investigation of Wear Behavior of Precipitation-Strengthened Nickel-Copper Based K-500 Alloy Produced by Powder Metallurgy

2016

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The present study investigates the effects of the ageing parameters of the precipitation-strengthened nickelcopper based K-500 alloy produced by powder metallurgy on the wear behavior of the alloy. After the cold pressing the prepared alloy powders under 600 MPa pressure, the samples were sintered under vacuum (10 −6 mbar) at 1150• C for 2 h and then cooled in the furnace. Produced K-500 alloy samples were taken into solution at 980• C for 1 h and quenched. Ageing process was carried out at 480• C for four different time periods (6,8,10, and 12 h). Aged samples were examined transmission electron microscope (TEM + EDS), X-ray diffraction (XRD), hardness and density measurements. The wear tests were carried out at 1 ms −1 constant sliding speed, under 40 N load and for five different sliding distances (400-2000 m). The results showed that there is γ Ni3(Al, Ti) inter-metallic phase coexisting with Al0.9Ni4.22, AlNi3 and NiO phases. According to the hardness measurements, the highest hardness values were obtained with samples aged for 8 h. In wear tests with 2000 m sliding distance, the lowest weight loss was observed for the samples aged for 8 h.

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Precipitation in the NiCu-base alloy monel K-500

Cited by 29 publications

References 19 publications

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

Measurement and Modeling of Hydrogen Environment-Assisted Cracking in Monel K-500

On the suitability of slow strain rate tensile testing for assessing hydrogen embrittlement susceptibility

Investigation of Wear Behavior of Precipitation-Strengthened Nickel-Copper Based K-500 Alloy Produced by Powder Metallurgy

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