氮碳合金化自保护硬面药芯焊丝堆焊层的组织与性能

Microstructure and Properties of Hardfacing Metal of Carbonitride Alloyed Self-shielded Hardfacing Flux-cored Wire

研制出了氮碳合金化自保护硬面药芯焊丝,探讨了回火温度对氮碳合金化自保护硬面药芯焊丝堆焊层硬度和耐磨性能的影响。结果表明:其堆焊层硬度为36.5～45.5 HRC,显微组织为板条马氏体和铬、钛、钒、铌的氮碳化物的复合物,堆焊层中的氮碳化物质点不易分解,有良好的稳定性和抗高温回火性能;回火温度为550℃时,堆焊层硬度达到最大值,回火温度高于550℃,硬度值基本保持不变;氮碳合金化自保护硬面药芯焊丝堆焊层金属的磨损机理为磨粒切削后塑性磨痕和氮碳化物的块状剥离,堆焊层具有良好耐磨性能的最佳回火温度为480～520℃。

The carbonitride alloyed self-shielded hardfacing flux-cored wire had been developed. The kdluence of the tempering temperature on hardness and wear-resisting property of hardiacing metal had been discussed. The hardness values of hardiacing metal are from 36. 5 to 45. 5 HRC, the microstructure of hardiacing metal consiste of lath-shaped martensite and carbonitride of Cr, Ti, V and Nb. These carbonitride is hard to be discomposed and had good stability and high temperature temper-resistant property. The hardness could reach the highest when the tempering temperature was 550 ＂C and the hardness is almost constant when the temperature is higher than 550℃. The weight loss of wear of carbonitride alloyed self-shielded hardfacing flux-cored wire is plastic grinding crack cut by abrasive particles and block desquamation temperature of carbonitride, and the hardfacing metal had good wearresisting property in the tempering temperature range of 480--20℃.