喷射成形高钒高速钢环坯制备技术研究

Research on preparation technology of high-vanadium HSS by spray forming

采用喷射成形技术制备高钒高速钢环坯,阐述了喷射成形制备过程方法及工艺参数,制备得到的沉积坯收得率为83.5%。对比观察沉积坯不同位置组织及碳化物形貌,发现:组织均匀细小,碳化物颗粒细小、形状较为规则、分布均匀,合金元素无宏观偏析;孔隙及缺陷主要位于沉积坯与基体的结合界面附近,产生于喷射沉积未完全稳定的试验初期。对热处理后的沉积坯试样进行硬度测试,喷射成形高钒钢淬火硬度为63HRC,高于粉末冶金高钒钢;经过3次回火,硬度逐渐下降,未出现二次硬化现象。

High-vanadium HSS ring billet was prepared by spray forming with yield of 83.5%. Spray forming preparation method and technological parameter were illustrated. The microstructure and carbide morphology on the different position of billet were observed. The results show that carbide particles have small size, regular shape and uniform distribution, alloy elements have no segregation. There are pores and defects nearby interface of deposited billet and substrate, which emerge in the unstable beginning stage of spray forming . The quenching hardness of spray formed high - vanadium HSS 63HRC, is higher than the powder metallurgy high - vanadium HSS. The hardness is gradually decreased by tempering for 3 times, does not appear secondary hardening.