On Hydrogen-Induced Void Nucleation and Grain Boundary Decohesion in Nickel-Base Alloys

[+] Author and Article Information
Y. Liang, P. Sofronis

University of Illinois at Urbana-Champaign, Department of Theoretical and Applied Mechanics, 104 S. Wright Street, Urbana, IL 61801

J. Eng. Mater. Technol 126(4), 368-377 (Nov 09, 2004) (10 pages) doi:10.1115/1.1789954 History: Received May 13, 2003; Revised February 23, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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(a) Schematic of the unit cell loaded by uniform displacement U2. Parameters ϕ+ and ϕ are hydrogen fluxes away from the particle/matrix interface (P/MI) or the grain boundary (GB) through their sides S+ and S, respectively, 0≤s≤sf is arclength along the P/MI and GB, and ϕint denotes hydrogen flux along the P/MI or GB; (b) A schematic lay out of the P/MI and GB finite elements. Parameter un denotes either PM/I or GB separation.
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Plot of macroscopic stress σ22 vs macroscopic logarithmic strain ε22 at a strain rate ε̇22=4.0×10−4/s. Parameter σ0 denotes the yield stress in uniaxial tension. The dashed curves are from the calculations of Liang and Sofronis 9 carried out in the absence of GB.
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Plot along the GB of (a) the nominal normal traction Tn0/3σ0, (b) the separation parameter q, (c) the hydrogen coverage Γ/Γmax against distance x1/R from the center of the particle and at various applied macroscopic strains ε22. Insets show the corresponding parameters on the P/MI plotted against angle θ=s/R in degrees. Parameter Tt0 denotes nominal tangential traction, and Γmax maximum P/MI or GB hydrogen coverage. The macroscopic strain rate ε̇22 was constant and equal to 4.0×10−4/s.
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Hydrogen distribution in the unit cell at various applied macroscopic strains ε22 and in the presence of the hydrogen effect on P/MI and GB cohesion. The macroscopic strain rate ε̇22 was constant and equal to 4.0×10−4/s.
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Strain rate effect on the macroscopic stress σ22-macroscopic logarithmic strain ε22 curve. Parameters σ22i and ε22i are respectively the values of σ220 and ε22 at the onset of the P/MI deohesion, and σ22c and ε22c are the corresponding parameters upon the cell failure.
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Strain rate effect on GB parameters at applied macroscopic strain ε22=0.0344: (a) normal traction; (b) separation; (c) hydrogen coverage. Insets show the corresponding parameters at the P/MI.
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Distribution of the effective plastic strain εp at applied macroscopic strain ε22=0.0705 and constant strain rate ε̇22=4.0×10−4/s. P/MI and GB cohesion reduction causes the deformation to tend to localize along a band at about 45°: (a) no hydrogen effect on cohesion; and (b) with hydrogen-induced cohesion reduction.




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