摘要本文以具有高强高导性能的Cu-Cr-Zr合金作为研究对象，采用连续驱动摩擦焊在不同的焊接工艺参数下对其进行焊接。通过自动硬度显微计测量焊缝接头处的硬度大小、金相显微镜观察焊缝各个区域内组织的生长情况、涡流导电仪测量接头的导电率等测试方法来研究Cu-Cr-Zr合金连续驱动摩擦焊接头组织的演变以及性能变化。 86750

试验研究表明：在本实验的范围内通过对焊接接头的各项组织性能的观察和分析，发现在一级摩擦时间4s，一级摩擦压力1Mpa，二级摩擦压力1Mpa，二级摩擦位移2mm，顶锻时间2s，顶锻压力1。3Mpa情况下，焊接接头的性能较好；焊缝到母材依次形成了焊合区、热机影响区以及过渡区，其中焊合区为等轴晶粒，热机影响区的组织主要为等轴晶并夹杂了少量的拉长晶粒，过渡区发生了部分变形和再结晶，同时含有少量等轴晶粒；焊接接头经过固溶+时效热处理后焊接接头的硬度和导电率都有一定幅度的提升。原始纤维状组织完全消失，晶粒转变成粗大等轴晶，同时含有少量退火孪晶。

毕业论文关键词：Cu-Cr-Zr合金；连续驱动摩擦焊；固溶、时效热处理

Abstract In this paper, Cu-Cr-Zr alloy is used as the research object with high strength and conductivity。 After using continuous drive friction welding under different welding parameters, we can measure microscopic hardness of weld joints by the automatic hardness microscopic machine; use metallurgical microscope to observe the grains’ growth in the different zones of the weld; test the conductivity of weld joints by eddy current testing machine。 And some other methods which are fitting to the microstructure evolution of Cu-Cr-Zr alloy can be used under continuous drive friction welding。

 Experimental results show that: after observation and analysis the properties of weld joints’ microstructure, we can find that when level one friction time is 4s, level one friction pressure is 1Mpa, level two friction pressure is 1Mpa, level two friction displacement is 2mm, upsetting forging time is 2s, under upset pressure is 1。3Mpa, we can get the better properties of weld joint than the weld joints under other parameters。 From the weld joint to the base metal are sequentially formed a weld zone, a heat affected zone and a transition zone。 The weld zone is equiaxed。 The heat mechanical affected zone is mainly equiaxed grains with few elongated grains。 And the transition zone’s grains are partly deformation and recrystallization。 But it still has a small amount of equiaxed grains in the transition zone。 Weld joint after solution and ageing heat treatment prove to have a certain level of improvement on its hardness and electrical conductivity。 And the raw fibrous tissue completely turns into coarse equiaxed grains with a small amount of annealing twins in the zone。

Keywords: Cu-Cr-Zr alloy; Continuous drive friction welding; solution and ageing heat treatment

目 录

第一章 绪 论 1

1。1 引言 1

1。2 Cu-Cr-Zr合金 1

1。2。1 Cu-Cr-Zr合金研究现状 1

1。2。2 Cu-Cr-Zr合金性能 2

1。3 摩擦焊技术介绍 4

1。4 铜合金的摩擦焊研究 5

1。5 研究背景及内容思路 6

第二章 试验材料、设备和方法 8

2。1 试验材料 8

2。2 试验设备 8

2。3 试验及测试方法