耐熱合金Inconel X-750のX線解析パターンによる破面観察

概要

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With the intention of applying the X-ray diffraction technique to the failure analysis of metal components, X-ray observations were conducted on the surfaces of a super alloy Inconel X-750 fractured by impact, creep-rupture, low-cycle fatigue and fatigue crack propagation tests at high temperatures. The comparison of fracturing processes at the surface and the measurement of plastic zone size under the surface were attempted by measuring the tangential length S_T of diffraction arcs in X-ray patterns. The results obtained are as follows: (1) An X-ray pattern with larger S_T was obtained from a fracture surface having the larger ratio of dimple area in the cases of static loading and low-cycle fatigue. (2) S_T had a correlation with the crack propagation rate and/or the repeated stress intensity factor in the case of high-cycle fatigue. (3) The relation between the depth of the plastic zone ωand the repeated stress intensity factor ΔK was approximately expressed by the equation of ω=0.15(ΔK/σ_0)^2mm, where σ_0 is 0.2% proof stress.
社団法人日本材料学会の論文
1976-01-15