不同碳含量GH3030合金冷拔的加工硬化及再结晶

Work Hardening and Recrystallization of Cold Drawn GH3030 Alloy with Different Carbon Content

通过真空感应炉熔炼制备了不同碳含量的GH3030合金铸锭,铸锭经锻造、热轧至Ф6.5mm合金棒,对其退火后开展了不同冷拔变形量的冷拔试验,并对不同冷拔变形量的丝材进行了600~900℃退火。采用光学显微镜(OM)和材料拉伸试验机等手段研究了不同碳含量GH3030合金冷拉拔的加工硬化及再结晶。研究结果表明,随碳含量的增加,合金的屈服强度和抗拉强度呈增加趋势,延伸率呈现降低趋势;合金的平均加工硬化速率呈现增加的趋势,最高可达9.1MPa·%^-1.当碳含量较低为0.016%时,冷拔变形量为80%的GH3030合金在700~800℃退火时可产生再结晶。碳含量增加至0.118%,变形量为80%时的再结晶温度略有降低,为600~700℃。

GH3030 alloy ingots with different carbon contents were prepared by vacuum induction furnace melting. The ingots were forged and hot rolled to 06.5mm alloy rods. After annealing,cold drawing tests were carried out with different cold drawing deformations. The cold drawn deformation of the wire was annealed at 600 to 900 ℃. The work hardening and recrystallization of cold drawing of GH3030 alloy with different carbon contents were studied by means of optical microscope ( OM ) and material tensile testing machine. The results show that with the increase of carbon content,the yield strength and tensile strength of the alloy increase,and the elongation decreases. The average work hardening rate of the alloy shows an increasing trend,up to 9.1 M Pa·%^-1. When the carbon content is lower at 0.016%,the GH3030 alloy with a cold drawing deformation of 80% can be recrystallized as it is annealed at 700 to 800℃. While the carbon content is increased to 0.118% and the deformation amount is 80%,the recrystallization temperature is slightly lowered to 600 to 700℃.