摘要
采用能实现大变形的等通道转角挤压法(ECAP),对H65黄铜进行ECAP变形实验,分析了H65黄铜在经ECAP变形后β相形态和硬度的演变规律。结果表明:铸态时β相呈半连续网状和短棒状无方向性分布,经ECAP奇数次挤压,β相变成了长条状,分布方向确定,间距变得紧密;经ECAP偶数次挤压,β相变成了粗的短棒状,分布方向不定,间距变得稀疏;ECAP变形对H65黄铜试样硬度提升作用明显,铸态时硬度值为70.8 HV,在3道次ECAP挤压后硬度达到最大值239.3 HV;β相对合金整体硬度的贡献主要发生在第1道次挤压,随后道次的挤压β相自身硬度值变化不大。
The ECAP method which can realize large deformation was adopted on H65 brass alloy,and the β phase morphology and microhardness of H65 brass alloy after ECAP process were systematically investigated. The results show that,the as cast β phase mainly presents as semi-continuous mesh or non-directional short rod. In odd passes of ECAP,β phase is stretched into long strip that the direction of distribution is determined,and the spaces between each β phases become closer. In even passes of ECAP,β phase is deformed into thick and short rod that the direction of distribution is uncertain,and the spaces between each β phases become sparse. The deformation of ECAP has obvious effect on the hardness of H65 brass sample,the microhardness of as cast is 70. 8 HV,which increases to a maximum of 239. 3 HV after 3 passes ECAP. The hardness improvement of brass alloy by β phase is mainly in the first pass of ECAP,the subsequent pass of ECAP has little change in β phase hardness.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2017年第6期185-189,196,共6页
Journal of Plasticity Engineering
基金
江西省教育厅科学技术研究重点项目(GJJ151345)
