18Ni(1700MPa)型马氏体时效钢时效工艺研究  

Aging process of 18Ni(1 700 MPa)maraging steel

作　　者：时雨[1] 卫广智[1] 赵飞[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《兵器材料科学与工程》2013年第3期89-91,共3页Ordnance Material Science and Engineering

基　　金：贵州省工业攻关项目(黔科合GY字(2011)3025)

摘　　要：研究不同时效温度和时间对820℃×1h固溶处理后的18Ni马氏体时效钢硬度的影响规律。研究了480℃时效3h和4h的拉伸性能,并利用金相显微镜、扫描电镜对时效后的组织和断口进行观察分析。结果表明:当时效温度较低(460℃),时效3h达到峰值的98%左右;在较高温度(520℃)时效,10min左右即可达到该水平;最优时效工艺为480℃×3h;两种时效工艺下的断口有明显的延伸和缩颈,中心存在大量韧窝,为典型的韧性断裂。The effects of different aging temperature and time on hardness of 18Ni maraging steel which was solution treated at 820 ℃ for 1 h were studied. The results show that when aging at 460 ℃ for 3 h tensile strenght reaches about 98% of peak value, while aging at 520 ℃ for about 10 min,tensile strenght rcaches the same level. Aging at 480 ℃ for 3 h is the optimal aging process in this experiments. The fracture is obvious extension and necking and a large number of dimples occur in the center. It is typical ductile fracture under two kinds of aging process.

关 键 词：18NI马氏体时效钢 时效 力学特性 Ni3Mo Ni3Ti 

分 类 号：TG156.92[金属学及工艺—热处理]