ER110S-1焊丝拉拔过程中退火工艺及机理探讨

Discussion on Spheroidizing Annealing Process and Mechanism of ER110S-1 Welding Wire in Drawing Process

用差热分析法确定了ER110S-1焊丝的相变点,通过扫描电镜观察分析了断口的形貌特征。进行多种再结晶退火和等温球化退火,用金相显微镜观察金相组织,测定维氏硬度和晶粒度,从而确定最佳球化退火工艺。研究表明:ER110S-1焊丝最佳球化退火工艺为660℃保温12 h,随炉冷至380℃空冷;ER110S-1焊丝进行再结晶退火的球化效果优于等温球化退火;ER110S-1焊丝预拉拔产生的塑性变形可以促进再结晶退火的球化率。

The phase transformation temperature of ER110S-1 welding wire was determined by DSC,and the fracture microstructure of ER110S-1 welding wire was observed by SEM.The different heat treatment technologies of recrystallization annealing and isothermal spheroidizing were conducted,the microstructure of ER110S-1 welding wire was observed,and the Vickers hardness and crystal size were measured,and the optimization recrystallization annealing technology was determined.The results show that the optimization recrystallization annealing technology is as follow： heating at 660 ℃ for 12 h,cooling until 380 ℃ in furnace and then cooling in air;the effect of recrystallization annealing is better than that of isothermal spheroidizing annealing;the deformation can promote the spheroidization rate in pre-drawing.