X線法による残留応力および不均一ひずみを用いたAl-Zn-Mg-Cu系合金の耐SCC特性の評価

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The stress corrosion cracking (SCC) resistance of two types of Al-Zn-Mg-Cu system alloys, one of which contains a superplastic material of fine grain structure prepared by thermo mechanical treatment and the other commercial materials of coarse grain structure prepared by conventional process, was evaluated. The SCC resistance of the two materials were markedly different ; Al-Zn-Mg-Cu system alloy with coarse grains was superior to that with fine grains. In this study, the effect of X-ray residual stress and random strain on the SCC resistance in the two alloys was discussed on the basis of experimental results. The main results obtained in the present work are as follows. (1) The macro residual stress in these alloys with fine grains and coarse grains measured by X-ray diffraction method. These alloys had compressive stress, and SCC life of these alloys increased with increasing compressive stress. (2) The random strains were estimated by X-ray diffraction method. The random strain values of the alloy with fine grains were larger than those of the alloy with coarse grains. The SCC life of the alloy increased with decreasing random strain. (3) The difference in SCC threshold stresses in L and T directions in the alloys with fine and that with coarse grains agreed with the difference in sum stress of macro and micro residual stresses from random strain. Furthermore. SCC threshold stress in both materials was determined from the total stress which is the sum of the macro and the micro residual stresses and the applied stress. (4) The SCC resistance of the materials can be estimated from the residual stress and the random strain by X-ray analysis.
社団法人日本機械学会の論文
1997-09-25

X線法による残留応力および不均一ひずみを用いたAl-Zn-Mg-Cu系合金の耐SCC特性の評価

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