발간논문

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Vol.30, No.10, 1165 ~ 1175, 1992
Title
Effect of coiling temperature on Phosphorous Segregation to Grain Boundary In Ultra - Low Carbon Steel Containing Ti and P
강희재H . J . Kang, 곽재현J . H . Kawk, 진광근K . K . Chin, 장삼규S . K . Chang
Abstract
Hot rolled ultra-low carbon steel strips containing Ti and P have occasionally broken tranversely to rolling direction in the process of pickling. An investigation for this failure was carried out by means of microscopy, mechanical tests and Auger electron spectroscopy. It was found that the failure occurred due to the combination of (1) The phosphorous segregation on ferrite grain boundaries, (2) the impact energy such as tension hunting, and (3) the surface defects which played a role as a notch. The phosphorous segregation was proved to be a major cause for the failure which occurred along the grain boundary. As the amount of phosphorous segregation exponentially increases with an increase in coiling temperature, it must be controlled below 650℃ to prevent the occurrence of the failure.
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