热轧温度对N18新锆合金板材织构的影响  

Effect of Hot-Rolling Temperature on the Texture of N18 Zirconium Alloy Plate

作　　者：彭倩[1] 刘彦章[1] 赵文金[1] 孙长龙[1] 

机构地区：[1]中国核动力研究设计院核燃料及材料重点实验室,成都610041

出　　处：《核动力工程》2005年第1期65-69,共5页Nuclear Power Engineering

摘　　要：研究了N18新锆合金在α/(α+β)相变点附近不同热轧温度对板材织构的影响。结果表明,N18合金板材经热轧、冷轧及再结晶退火加工后,fn和fr增加,ft减小。热轧温度对织构的影响较小。热轧温度高于780℃的几块板材的织构基本一致;与热轧温度为750℃的板材相比,fn减小,ft略有增加。温度高于780℃,N18合金中出现β相,并且β相含量随温度升高而增加。750℃时热轧N18合金的形变遵循α相(hcp)的形变机制。780℃至820℃热轧,合金的织构仍由α相的变形所控制,除了锥面滑移和柱面滑移开外,还伴随高温形变机制,晶界分布的β相对晶界滑动机制有促进作用。The texture evolution of plates after rolling at different temperatures was investigated. The result shows that after hot-rolling, cold-rolling and re-crystallized annealing, textures of the N18 plates varied, i.e., fn and fr increased, and ft decreased. The effect of the temperature of hot rolling on the texture can be summarized as follows: when hot rolling temperature changed from 750°C to 780°C, fn decreased, and ft and fr increased slightly. But when hot rolling temperature was higher than 780°C, there was little difference in texture with the increasing of temperature. β phase can be formed in N18 when temperature was higher than 780°C, and the volume fraction of β phase increased with the increasing of temperature. The deformation of N18 at 750°C followed the HCP crystal deformation mechanism. When rolling temperature was 780°C-820°C, the textures of N18 were mainly controlled by the deformation of α phase. But when temperature was high enough, non-crystal mechanism and crystal boundary slide mechanism were also activated, besides the slip mechanism. Crystal boundary slide mechanism can be promoted by β phase distributing along a grain boundaries.

关 键 词：N18锆合金 织构 轧制温度 

分 类 号：TG14[一般工业技术—材料科学与工程]