等效应变对Cu-38Zn合金交叉模压形变后组织和性能的影响

Influence of equivalent strain on microstructure and hardness of Cu- 38Zn alloy subjected to cross groove pressing

采用ABAQUS软件对Cu-38Zn合金交叉模压形变过程进行了有限元模拟,观察并研究了Cu-38Zn合金的微观组织和硬度,探讨了模压形变的等效应变与材料组织和性能的关系。结果表明,交叉模压形变后的等效应变分布是不均匀的,造成微观组织和硬度的分布也不均匀。随着模压形变周期增大,Cu-38Zn合金的等效应变增大;晶粒尺寸减小;显微硬度增大。等效应变还影响模压形变的变形机理。

Finite element （FE） analysis was used in the simulation of constrained groove pressing （CGP） of Cu-38Zn alloy by ABAQUS software. Microstructure and hardness of Cu-38Zn alloy were studied. The relationship between the equivalent strain of the specimen deformed by mould pressing, microstructure and mechanical characteristics of Cu-38Zn alloy was investigated. The results show that the distribution of the equivalent strain is non-uniform in the samples subjected to CGP, which influences the corresponding non-uniformity in the microstructure and hardness of Cu-38Zn alloy. With the increasing of the groove .pressing cycles, the grains of Cu-38Zn alloy become finer and the hardness increases. The value of the equivalent strain in the Cu-38Zn alloy specimen affects the plastic deformation mechanism of the alloy subjected to CGP.