TiAl与GH3039异种材料摩擦焊接工艺及接头组织

王松林; 杜随更; 李娜

doi:10.13433/j.cnki.1003-8728.20200272

TiAl与GH3039异种材料摩擦焊接工艺及接头组织

doi: 10.13433/j.cnki.1003-8728.20200272

王松林^1,,
杜随更^1, ,,
李娜^{1, 2}

1.
西北工业大学机电学院航空发动机高性能制造工业和信息化部重点实验室，西安　710072
2.
平凉职业技术学院，甘肃平凉　744000

基金项目: 国家自然科学基金项目（51675434）资助

详细信息

作者简介:
王松林（1989−），博士研究生，研究方向为摩擦焊接工艺及机械连接技术，wangsonglin10@126.com

通讯作者:
杜随更，教授，博士生导师，fwcenter@nwpu.edu.cn

中图分类号: TG44
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- 文章访问数: 135
- HTML全文浏览量: 18
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2019-12-10
- 网络出版日期: 2020-12-08
- 刊出日期: 2020-12-05

Technique and Microstructure of Friction Joint of TiAl and GH3039 Dissimilar Aollys

Wang Songlin^1
,,
Du Suigeng^{1
, ,},
Li Na^{1, 2}

1.
Key Laboratory of High Performance Manufacturing for Aero Engine, Ministry of Industry and Information Technology, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
2.
Pingliang Vocational and Technical College, Gansu Pingliang 744000, China

摘要

摘要: 为提高TiAl与GH3039异种材料摩擦焊接接头性能，对主要摩擦焊接参数进行优化，利用半自然热电偶法对焊接过程界面温度进行实时测量，采用扫描电镜（SEM）和能谱仪（EDS）对界面组织结构及拉伸断口进行分析。结果表明：GH3039出模量的变化对接头抗拉强度影响较大，当出模量为4.1 mm时，接头强度可达374 MPa。通过标定NiSi-GH3039热接点热电势与温度的关系，测量得到准稳定摩擦阶段界面温度为960 ~1 030 °C，处于TiAl合金的超塑性温度范围。焊后界面结合良好，没有裂纹及孔穴等缺陷，焊合区形成了五层合金相过渡层。接头断裂易发生于Al₃NiTi₂脆性相层，断口主要形貌为凹凸的摩擦环。
- 摩擦焊 /
- 界面测温 /
- 半自然热电偶 /
- TiAl合金 /
- GH3039高温合金
Abstract: To improve the properties of the friction welded joints of TiAl and GH3039 dissimilar alloys, the key welding parameters were optimized. The temperature of the welding interface was measured in real-time by using the semi-natural thermocouple. The interfacial microstructure and fracture morphology of the friction welded joint were investigated by using the scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It is found that the length out of the constraint sleeve of GH3039 had a great influence on the tensile strength of the joint. The joint strength reached 374 MPa at a length of 4.1 mm. The relationship between the thermoelectric potential of NiSi-GH3039 hot junction and the temperature was established. During the quasi-stabilized friction stage, the interfacial temperature at 960 −1 030 °C was consistent with the superplastic temperature of TiAl alloy. No defect such as crack and cavity was found in the welding interface. Five intermediate phase layers were formed in the welding zone. The fracture of the joint was mainly occurred in the Al₃NiTi₂ brittle phase layer, and the primary fracture morphology was in the form of the uneven friction ring.
- friction welding /
- interfacial temperature measurement /
- semi-natural thermocouple /
- TiAl alloy /
- GH3039 superally

HTML全文

图 1 试样制备示意图

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图 2 测温回路原理图

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图 3 拘束套约束方式示意图

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图 4 不同出模量下的抗拉强度和摩擦缩短量

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图 5 不同出模量下的飞边形貌

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图 6 NiSi-G3039半自然热电偶热电势标定曲线

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图 7 焊接过程参数变化曲线

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图 8 焊接界面微观组织

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图 9 焊接界面合金元素EPMA线扫描

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图 10 TiAl侧热力影响区微观组织

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图 11 不同出模量下的断口宏观形貌

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图 12 TiAl侧断口微观形貌

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表 1 材料化学成分 %

材料	Ti	Al	Ni	Cr	V	Fe	Mo	Nb
TiAl	49.0	47.5	−	1.0	2.5	−	−	−
GH3039	0.6	1.1	69.6	22.6	−	2.9	1.2	0.7

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表 2 断口不同区域EDS元素含量 %

区域	Ti	Al	Ni	Cr	V	Fe	Mo	Nb
1	53.22	34.86	3.43	2.88	5.39	0.13	0.01	0.04
2	40.23	39.20	13.63	3.96	2.33	0.42	0.15	0.06
3	18.49	20.80	45.17	13.08	1.25	0.10	0.56	0.43

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