锻压技术

ECAP和轧制工艺对H65黄铜β相形态和抗拉强度的影响

英文标题：Influences of ECAP and rolling process on β phase morphology and tensile strength of brass H65

作者：胡玉军李峻薇旷军平

关键词：ECAP变形轧制 H65黄铜 β相抗拉强度

分类号：TG379；TG339；TG146.11

出版年,卷(期):页码：2017,42(10):101-105

摘要：

开展H65黄铜等通道转角挤压和轧制试验，研究ECAP变形和轧制变形前后，试样β相形态和抗拉强度的演变。结果表明：铸态时，β相分布无方向性，呈半连续网状和短棒状；经奇数道次变形后，β相平行间距变得紧密，并与水平约成30°分布，成长条状；经偶数道次变形后，β相平行间距稀疏，取向不定，呈粗的短棒状；经任何道次的ECAP变形再经轧制后，β相平行间距减小，几乎全部变成水平分布，且变得更加细长。H65黄铜在ECAP变形过程中，随着挤压道次的增加，抗拉强度值整体表现为上升趋势；同一试样在ECAP变形后再经轧制其抗拉强度值变大。β相取向与拉伸轴线夹角越小，β相平行间距越窄，H65黄铜的抗拉强度值越大。

The equal channel angular pressing（ECAP） and rolling tests for brass H65 were conducted, and the evolutions of β phase morphology and tensile strength of samples before and after ECAP and rolling deformations were studied. The results show that the β phase in cast state mainly presents as semi-continuous mesh and short rod without directions. After odd passes of ECAP deformation, the parallel space of β phase becomes closer, and the β phase is elongated long strip with the angle of 30° between β phase and extrusion direction. However, after even passes of ECAP deformation, the parallel space of β phase becomes sparse, and the β phase is deformed into short rod without directions. Furthermore, after any passes of ECAP deformation and rolling, the parallel space of β phase becomes small, and almost all the β phase becomes longer with the horizontal distribution. Thus, the tensile strength of brass H65 increases with the increasing of extrusion passes, and after ECAP deformation and rolling, the tensile strength of the same sample is improved greatly. At last, the smaller the angle between β phase direction and tensile axis is, the narrower the parallel space of β phase is, the bigger the tensile strength of brass H65 is.

基金项目：

江西省教育厅科学技术研究重点项目（GJJ151345）

作者简介：胡玉军（1989-），男，硕士，助教，E-mail：hyj0525@126.com

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