Influence of vanadium filler on the properties of titanium and steel TIG welded joints

被引：64
作者：
Chu, Qiaoling [1 ]
Zhang, Min [1 ]
Li, Jihong [1 ]
Yan, Cheng [2 ]
Qin, Zhanling [3 ]
机构：
[1] Xian Univ Technol, Coll Mat Sci & Engn, Xian 710048, Peoples R China
[2] Queensland Univ Technol, Sch Chem Phys & Mech Engn, Fac Sci & Engn, Brisbane, Qld 4001, Australia
[3] Xian Aerosp Power Machine Factory, Xian 710025, Peoples R China
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2017年 / 240卷
基金：
国家高技术研究发展计划(863计划);
关键词：
Welding; Vanadium; Microstructure; Intermetallics; Residual stress; STAINLESS-STEEL; OMEGA PHASE; V SYSTEM; MECHANICAL-PROPERTIES; PURE VANADIUM; ALLOYS; INTERLAYER; TI-6AL-4V; MICROSTRUCTURE; METAL;
D O I：
10.1016/j.jmatprotec.2016.06.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Fusion bonding of Ti Ti, Fe Fe and Ti/Fe Ti/Fe butt-welded joints through vanadium filler metal was investigated. Tungsten inert gas (TIG) welding method was employed. The microstructures of the welded joints were analyzed by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Mechanical properties of the joints were evaluated by microhardness tests and tensile tests. Vanadium exhibited good bonding with adjacent materials in Ti-Ti and Fe-Fe welded joints. Continuous solid solutions were observed in both Ti-Ti and Fe-Fe joints. Ti-V-Ti and Fe V -Fe welds exhibited the average tensile strength of 416 MPa and 434 MPa, respectively. Vanadium, ER50-6 and ERTi-1 filler metals were applied to join Ti/Fe bimetallic sheet. Serious cracks were observed in the joint. XRD pattern of the fractured surface confirmed the Fe2Ti and o" intermetallics. The regions dominated by Fe-Ti compounds exhibited high hardness values (-1112HVO.01). Cracks initiated and propagated in regions rich in Fe-Ti and o- intermetallic phases. The magnitude and distribution of welding residual stresses were estimated by finite element method.The peak Von Mises stresses (Ti-V-Ti, 501 MPa; Fe-V-Fe, 555 MPa) occurred in the base metals near V welds. The brittle intermetallics and high thermal induced stresses resulted in the cracking in Ti/Fe-Ti/Fe welded joint. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：293 / 304
页数：12
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