발간논문

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Vol.23, No.5, 521 ~ 529, 1985
Title
The Effect of Hydrogen on the tensile Properties of Low Carbon Steel
신동혁Dong Hyuk Shin, 천병선Byong Sun Chun, 위명용Myeong Yong Wey
Abstract
The effect of hydrogen on the tensile properties of low carbon steel was investigated at room temperature for the wide ranges of charging current density and strain rate. As the current density increased, the yield point phenomena gradually disappeared, i.e., the upper yield point disappeared, the yield elongation decreased and the stress continuously increased in yield elongation range. The results were explained in terms of the generation of mobile dislocations based on the observation of Lu¨ders band. The observed yield point phenomena did not changed even after removing the hydrogen dissolved in the specimen by vacuum treatment. A change in the average dimple size was observed for the hydrogen removed specimen. This was caused by the irreversible lattice defects generated during hydrogen charging. The flow stress of the specimen prestrained and hydrogen-charged was higher than the uncharged specimen. This lattice hardening should be explained by a non-Cottrell type of interaction between hydrogen and dislocations.
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