Author: Y. Pardhi
Publisher:
ISBN:
Category : Fatigue crack propagation
Languages : en
Pages : 19
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The inertia friction welding process is being extensively investigated for the joining of high strength titanium alloys for aerospace applications. Although it offers solid state joining, the thermal cycle and deformation involved results in microstructural inhomogeneity across the weld interface. In this paper, the fatigue crack propagation behavior in an inertia welded microstructure in a high strength, high temperature ?/? titanium alloy is considered. The fatigue crack propagation behavior in corner notched weld specimens at varying stress ratios is studied at room and elevated temperatures and compared with that of the parent material. Fatigue crack growth rates at lower stress intensity ranges are comparable with those in the parent material. However, in weld specimens tested at room temperature, unstable crack growth occurs at lower stress intensity range values compared to that at high temperature. Fracture surface observations show that this difference is related to a change in fracture mode from transgranular to intergranular/mixed mode during room temperature tests. This change in fatigue crack growth mechanism is deduced to be due to low ductility intergranular failure of grain boundary ? in the refined transformed beta microstructure across the weld interface.
Author: Y. Pardhi
Publisher:
ISBN:
Category : Microstructure
Languages : en
Pages : 14
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Book Description
Author: R. G. Broadwell
Publisher: ASTM International
ISBN: 9780803105911
Category : Technology & Engineering
Languages : en
Pages : 306
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Fatigue crack growth rate (FCGR) tests were conducted on Titanium Alloy Ti-5111 weld metal in air, artificial seawater, and artificial seawater with an applied cathodic potential. The results indicated a minor effect of seawater in increasing FCGR of Ti-5111 weld metal. However, the application of a cathodic potential of 0.987 V versus Ag/AgCl reference electrode showed crack growth rates similar to FCGR in air. Additionally, comparisons are made regarding the FCGR behavior of Ti-5111 plate, Ti-100 (Ti-621-0.8Mo) plate, and Ti-5111 weld metal in both air and seawater. These results indicated that both high strength titanium alloy grades, including the base and weld metal, performed similarly in all test environments.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 976
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Mahesh Chaturvedi
Publisher: Woodhead Publishing
ISBN: 0128191414
Category : Technology & Engineering
Languages : en
Pages : 460
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Book Description
Welding and Joining of Aerospace Materials, Second Edition, is an essential reference for engineers and designers in the aerospace, materials, welding and joining industries, as well as companies and other organizations operating in these sectors. This updated edition brings together an international team of experts with updated and new chapters on electron beam welding, friction stir welding, weld-bead cracking, and recent developments in arc welding. Highlights new trends and techniques for aerospace materials and manufacture and repair of their components Covers many joining techniques, including riveting, composite-to-metal bonding, and diffusion bonding Contains updated coverage on recently developed welding techniques for aerospace materials
Author: C. M. Hudson
Publisher:
ISBN:
Category : Materials at high temperatures
Languages : en
Pages : 40
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Book Description
Author: Todd P. Albertson
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 214
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Book Description
Author: S. Lesterlin
Publisher:
ISBN:
Category : Environment
Languages : en
Pages : 23
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Book Description
The fatigue crack propagation behavior of a Ti-6Al-4V alloy has been investigated at room temperature and at 300°C. Tests were run in air, high vacuum, and some other environments with controlled partial pressure of water vapor and oxygen. The enhancement of the fatigue crack growth rates observed in air in comparison to high vacuum, considered as an inert environment, is clearly attributed to the presence of water vapor. Tests in a controlled environment demonstrate that very low partial pressure can accelerate crack propagation. On the basis of previous studies on Al alloys and steels, two controlling mechanisms are considered and discussed, namely, a propagation-assisted water vapor adsorption and a hydrogen-assisted propagation.
Author: Jiayun Jiang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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