摘要：TC4钛合金是一种使用较为广泛的常用钛合金，从它的综合性能好、使用时间长久和熟练的制造工艺。传统的钛合金零件在加工时，总会因复杂繁多的工序而使其切削量增大。但钛合金价格昂贵，零件生产成本较高。堆焊成型技术具有几乎无损成形、效率较高的一种零件制造技术。因为等离子焊具有较高的能量密度、操作方便、成形效果好。本次课题主要探究了TC4钛合金在等离子增材制造中的工艺。初步了解其单道焊成形结果与其焊接工艺参数的关系。在此基础上，还研究了等离子多层堆焊中不同焊接工艺对TC4钛合金微观组织和力学性能的影响。

关键词 TC4钛合金;等离子增材制造；外观形貌；微观组织；力学性能

毕业设计说明书外文摘要

Title Study on Plasma 3D Printing Technology of Titanium Alloy

Abstract：TC4 Titanium alloy is a widely used titanium alloy, from its comprehensive performance, the use of long-term and skilled manufacturing process.Traditional titanium parts in the processing, always because of the complexity of the process and make the amount of cutting. But the titanium alloy is expensive, parts production costs are higher.Surfacing technology has a nearly lossless forming, high efficiency of a part manufacturing technology. Because plasma welding has a high energy density, easy to operate, forming effect is good.This topic mainly explored the TC4 titanium alloy in the plasma by the process of manufacturing. The relationship between the results of single pass welding and the welding process parameters is obtained. On the basis of this, the effects of different welding processes on microstructure and mechanical properties of TC4 titanium alloy in plasma multilayer surfacing were also studied.

Keywords   TC4 titanium alloy;Made of plasma material appearance morphology; microstructure; mechanical properties

目 次

1绪论 1

1.1课题研究背景和意义 1

1.2TC4钛合金的基本性能和焊接性 1

1.3 等离子增材制造 3

1.4本文的主要研究内容 4

2实验材料、设备与方案 6

2.1实验材料 6

2.2实验设备 6

2.3实验材料分析方法 6

3单层堆焊中工件成形与工艺参数的关系 9

3.1单层焊堆焊正交试验方案 9

3.2单层焊外观形貌分析 10

3.3本章小结 12

4多层堆焊中焊接参数对宏观形貌特征和微观组织的影响 13

4.1多层堆焊实验方案 13

4.2多层堆焊成型工件中的焊接工艺与外观形貌的关系 13

4.3 多层堆焊工件的微观组织 14

4.4焊接工艺参数对微观组织的影响 17

4.5本章小结 19

5多层堆焊中的力学性能 21

5.1等离子TC4钛合金多层堆焊工件的力学性能 21

5.2断裂现象