발간논문

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Vol.39, No.3, 282 ~ 287, 2001
Title
Research Paper / Mechaical Behavior : Effect of Decarburization Atmosphere on the Yield Point Elongation of Extra - Low Carbon Steel for Shadow Mask
김교성Gyo Sung Kim,황순영Soon Young Hwang
Abstract
Yield point elongation(YP-EL) should be suppressed in shadow mask after decarburization annealing due to higher yield strength and non-uniform deformation. The effect of decarburization annealing atmosphere was examined to optimize the processing conditions. Laboratory experimental results revealed that YP-EL was decreased with higher dew point and annealing temperature. However, hydrogen partial pressure and gas flow rate did not show significant effect on YP-EL. Calculated diffusion rate of carbon showed that the decarburization was controlled by surface reaction. The YP-EL of shadow mask was varied according to the stacked position in the production line. This phenomenon was analyzed by thermodynamic calculation of equilibrium carbon content with CO+CO₂ gas, which could be formed by decarburization reaction.
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