Solution Annealing Process for ERNiCrMo-3 Welding Wire in Drawing Process
In order to relieve the work-hardening of ERNiCrMo-3 welding wire in drawing process by solution annealing,the samples were heated at different temperature (930℃,980 ℃,1038 ℃,1093 ℃ or 1143 ℃),for different time (15 min,30 min or 45 min),and cooling by air,wind or water.The microstructure was observed and the grain size and Vickers hardness were measured,the changes of microstructure,grain size,hardness and solid solution annealing process were discussed.The results show that:the strengthening phases precipitates fewer and the vickers hardness decreases with cooling speed increasing;with the temperature increasing,the Vickers hardness decreases and the grain size increases,the grain size is mainly affected by temperature;the optimum solution annealing process:heating at 1038 ℃ for 30 min,cooling by water.