摘要
Surface crack of components of the cast nickel base superalloy was repaired with twin laser beams under proper technological conditions. One laser beam was used to melt the substrate material of crack, and the other to fill in powder material to the crack region. The experimental results show that the surface crack with the width of 0.1 ～ 0.3?mm could be repaired under the laser power of 3?kW and the scanning speed of 6 ～ 8?mm/s. The repaired deepness of crack region is below 6.5?mm. The microstructure of repaired region is the cellular crystal, columnar crystal dendrite crystal from the transition region to the top filled layer. The phases in repaired region mainly consisted of supersaturated α Co with plenty of Ni, some Cr and Al, Cr 23 C 6, Co 2B, Co Ni Mo, Ni 4B 3, TiSi and VSi. The hardness of filled layer in repaired region ranged from HV 0.2 450 to HV 0.2 500, and the hardness decreases gradually from the filled layer to joined zone.
Surface crack of components of the cast nickel-base superalloy was repaired with twin laser beams under proper technological conditions. One laser beam was used to melt the substrate material of crack, and the other to fill in powder material to the crack region. The experimental results show that the surface crack with the width of 0.1 similar to0.3 mm. could be repaired under the laser power of 3 kW and the scanning speed of 6 similar to8 mm/s. The repaired deepness of crack region is below 6.5 mm. The microstructure of repaired region is the cellular crystal, columnar crystal dendrite crystal from the transition region to the top filled layer. The phases in repaired region mainly consisted of supersaturated a-Co with plenty of Ni, some Cr and Al, Cr23C6, Co2B, Co-Ni-Mo, M4B3, TiSi and VSi. The hardness of filled layer in repaired region ranged from HV(0.2)450 to HV(0.2)500, and the hardness decreases gradually from the filled layer to joined zone.
出处
《中国有色金属学会会刊：英文版》
CSCD
2001年第4期572-575,共4页
Transactions of Nonferrous Metals Society of China
基金
Project ( 5 990 60 0 4)supportedbytheNationalNaturalScienceFoundationofChina
ProjectsupportedbytheResearchFoun dationofStateKeyLab .ofLaserTech .atHuazhongUniversityofScienceandTechnology
