18Ni马氏体时效钢热变形行为  

Hot deformation behaviour of 18Ni maraging steel

作　　者：任永海[1] 赵飞[1,2] 严琰[1] 张占玲[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《兵器材料科学与工程》2013年第1期114-117,共4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：研究马氏体时效钢的热变形问题具有理论意义。在变形温度为900～1050℃，应变速率为0．001-1s-1，最大真应变为1．2的条件下，利用Gleeble-3800热模拟试验机研究18Ni（1700MPa）马氏体时效钢的热压缩变形行为，建立该合金的热加工图，并对组织演变规律进行研究。结果表明：在实验条件下，随变形温度的升高和应变速率的降低，合金的流变应力和峰值应变逐渐减小，而能量耗散率（η）逐渐升高，动态再结晶过程进行更充分；当应变量为0．6，流动失稳区面积最小。确定了18Ni马氏体时效钢的完全再结晶区域。The study on hot deformation behaviour of maraging steel has important theoretical significance. The hot compression deformation behavior of 18Ni （ 1 700 MPa） maraging steel was investigated on Gleeble-3800 hotsimulator at temperature of 900 to 1 050 ℃ , strain rate of 0.001 to 1 s-1 and maximum true strain value of 1.2. Its processing maps were established and microstructure evolution was analyzed. The results show that under the experimental conditions, the flow stress and its corresponding peak strain decrease gradually with temperature increasing and strain rate decreasing, but the efficiency of power dissipation of 18Ni maraging steel increases gradually, the dynamic recrystallization process can be fully promoted, the area of flow instability is minimum at the strain of 0.6. The complete recrystallization region of 18Ni maraging steel is ascertained.

关 键 词：18NI马氏体时效钢 热压缩 热加工图 动态再结晶 

分 类 号：TG115.66[金属学及工艺—物理冶金]