Effect of oxygen concentration on surface hot shortness of steel induced by copper

Abstract

Since the Cu content in steel causes hot shortness, it is important to understand the behavior of Cu during high-temperature oxidation in order to control the precipitated Cu. This study examined Cu distribution during the oxidation of steel. The oxidation tests revealed that precipitated Cu existing in the scale/steel interface was absorbed into the Fe 3 O 4 layer or evaporated into the atmosphere as Cu. Then, a method proposed to suppress hot shortness was tested by oxidation-tensile tests at high temperature and the method was proven to be effective.