Nanomechanical probes as new approaches to hydrogen/deformation interaction studies

Katz, Y.; Tymiak, N. I.; Gerberich, William W

doi:10.1016/s0013-7944(00)00119-3

Cited by 101 publications

(55 citation statements)

References 72 publications

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“…Surrounding-tip plasticity is represented by a superdislocation located at the centroid of the highly strained continuum plastic zone, and related to stress intensity. [44,81,82] Crack tip stress of order 16 to 25 GPa is predicted for Fe-Si and Mo, [44] and is maximum at 20 to 100 nm ahead of the crack tip surface. This estimate is consistent with Oriani's original decohesion model.…”

Section: E Threshold For Heacmentioning

confidence: 99%

“…Prediction of the applied potential dependence of the quasi-static K TH for HEAC utilizes the crack tip micromechanical model by Gerberich et al [41,81,82] (Eq. [11]), based on H decohesion [83][84][85] and experimentally validated for a range of steels and a Ni-based superalloy.…”

Section: E Threshold For Heacmentioning

confidence: 99%

“…[1]. The discrete dislocation model (maximum hydrostatic stress~20 r YS at 20 to 100 nm beneath the crack tip) [41,81,82] and a blunted crack finite element model (maximum hydrostatic stress 3 to 5 r YS at 2 to 5 lm) [52,53] bound the crack tip stress field relevant for HEAC modeling. This latter hydrostatic stress may be increased if strain gradient plasticity impacts the crack tip stress distribution.…”

Section: E Threshold For Heacmentioning

confidence: 99%

“…The values of a¢¢ (0.00018 MPa m) and b¢ (0.26/ MPaÖm) in Eq. [1] were established by analytical approximation to the dislocation simulations of the near-crack-tip stress field, [41,81,82] and validated by experiment. [43] The intrinsic Griffith toughness of the IG interface without H, k IG , is not physically related to K IC for microvoid fracture (198 to 340 MPaÖm; Table II) or to the K levels that caused TG creep crack growth in Monel K-500 (60 to 80 MPaÖm, Figure 6).…”

Section: E Threshold For Heacmentioning

confidence: 99%

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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: E Threshold For Heacmentioning

confidence: 99%

Section: E Threshold For Heacmentioning

confidence: 99%

Section: E Threshold For Heacmentioning

confidence: 99%

Section: E Threshold For Heacmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Micromechanical models of stress intensity thresholds and growth rates for IHIAC and HELAC exist, but contain multiple-adjustable parameters due to persisting uncertainties, as reviewed in detail elsewhere [33][34][35][36]. …”

Section: Com)mentioning

confidence: 99%

Critical issues in hydrogen assisted cracking of structural alloys

Gangloff

2008

Environment-Induced Cracking of Materials

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The High Cycle Fatigue and Final Fracture Behavior of Alloy Steel 4140 used in Hydrogen Pressure Vessels: Influence of Copper Plating

Srivatsan

Balogun

Prakash

et al. 2010

Fatigue of Materials

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Nanomechanical probes as new approaches to hydrogen/deformation interaction studies

Cited by 101 publications

References 72 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

Critical issues in hydrogen assisted cracking of structural alloys

The High Cycle Fatigue and Final Fracture Behavior of Alloy Steel 4140 used in Hydrogen Pressure Vessels: Influence of Copper Plating

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