摘要
对具有不同层错能的材料:Q235钢、纯铜和H62黄铜分别进行模压形变试验,并对其模压形变后的显微组织和力学性能进行研究。结果表明:模压形变可以有效地细化材料的晶粒尺寸;金属材料的层错能越低,晶粒细化效果越好;随着模压道次的增加材料的显微硬度升高;层错能低的H62黄铜,随形变道次增大硬度增加幅度更高。中高层错能的纯铜和Q235钢主要以位错机制细化晶粒,低层错能的H62黄铜主要以位错机制和孪生方式共同作用使晶粒细化。
Q235 steel,pure copper and H62 brass with different stacking fault energy( SFE) were deformed by using constrained groove pressing( CGP). The effects of constrained groove pressing on microstructure and mechanical properties of the materials were studied.The results show that constrained groove pressing is an effective way in refining the grain size of the materials,with the decreasing of SFE,the grain refinement rate increases. The hardness of the materials increases with the increasing of CGP passes,and the amplitude of increasing hardness of H62 brass with low SFE is higher than that of pure copper and Q235 steel with medium-high SFE. The grain refinement of pure copper and Q235 steel with medium-high SFE is caused by dislocation slip,and H62 brass with low SFE is caused by dislocation slip and twinning during constrained groove pressing.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第10期75-81,共7页
Transactions of Materials and Heat Treatment
基金
福建省自然科学基金资助项目(2011J01290)
关键词
模压形变
大塑性变形
晶粒细化
Q235钢
纯铜
H62黄铜
层错能
constrained groove pressing
severe plastic deformation
grain refinement
Q235 steel
pure copper
H62 brass
stacking fault energy
