鋼の水素脆化と鋼中水素の微視的挙動に関する研究(第 2 報) : 電気化学的手法による塑性変形局部領域での水素拡散に対する検討

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The effect of deformation on hydrogen diffusion has been studied with an electro-chemical flux monitoring technique sensitive to (10)^<-13> atomsH/(cm)^2-s during tensile test and constant load rupture test. Tensile test and constant load test have carried out, over a range of aging time and strain rates, on notched specimens of steel, hydrogen charged and quenched. When specimen was allowed to stand at room temperature under removed stress after deformation, the amount of evolved hydrogen decreased with increasing plastic strain and diffusion coefficient of hydrogen at near by notched part decreased. The result is explained by suggesting that hydrogen is trapped in defects and dislocations in plastic enclave. During tensile test, with increasing plastic strain, the amount of evolved hydrogen from plastic enclave increased than from elastic range in specimen and increased with decreasing deformed velosity, as cross head speed. As aging time increases, evolved hydrogen from near by notch increased and N. T. S. decreased, with more increasing aging time, N. T. S. recovered from embrittlement and that hydrogen decreased. The results are explained by suggesting that hydrogen trapped mainly dislocations is trasported with dislocation to plastic enclave under slower C. H. S. and with more increasing aging time removed out from dislocation. However, under quick C. H. S., trapped hydrogen is broken away from dislocation. On the constant load rupture test, the amount of evolved hydrogen from plastic enclave near by notched part and crack tip increased remarkably right before hydrogen delayed cracking.
社団法人溶接学会の論文
1977-01-05

鋼の水素脆化と鋼中水素の微視的挙動に関する研究(第 2 報) : 電気化学的手法による塑性変形局部領域での水素拡散に対する検討

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