レーザスポレーション法を用いたCu添加炭素鋼の酸化スケールの密着性状の推定

抄録

The oxide scale formed on low carbon steel during hot rolling process is removed with high pressure water jets in its production process. Some researchers reported that the adhesive strength of the oxide scale was depended on structure of the scale and chemical composition in a substrate. However, the adhesive strength is still unclear. In this study, the effect of Cu addition and heat-treatment processes on adhesive strength of the oxide scale on carbon steel was estimated with a laser spallation technique. Estimated adhesive strength of the scale treated by reheating at 380 oC for phase change of the scale after 700 oC to form a scale were around 40 to 50 MPa. The strength of the samples including Cu content of 1 % with reheating process were higher than those without reheating. Whereas the adhesive strength tended to decrease with increasing Cu content and decreased to about 30 to 45MPa at Cu content of 3 to 5 % for all heat-treatment due to Cu precipitation as a layer along the scale/substrate interface.