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High cycle fatigue of weld repaired cast Ti-6AI-4V

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Abstract

In order to determine the effects of weld repair on fatigue life of titanium-6Al-4V castings, a series of specimens was exposed to variations in heat treatment, weld procedure, HIP cycle, cooling rate, and surface finish. The results indicate that weld repair is not detrimental to HCF properties as fatigue cracks were located primarily in the base metal. Fine surface finish and large colony size are the primary variables improving the fatigue life. The fusion zone resisted fatigue crack initiation due to a basketweave morphology and thin grain boundary alpha. Multipass welds were shown not to affect fatigue life when compared with single pass welds. A secondary HIP treatment was not detrimental to fatigue properties, but was found to be unnecessary.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    G. B. Hunter (Graduate Student) & T. W. Eagar (Metallurgist)

  2. United States Army Materials and Mechanics Research Center, 02172, Watertown, MA

    F. S. Hodi (Associate Professor)

Authors
  1. G. B. Hunter
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  2. F. S. Hodi
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  3. T. W. Eagar
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Hunter, G.B., Hodi, F.S. & Eagar, T.W. High cycle fatigue of weld repaired cast Ti-6AI-4V. Metall Trans A 13, 1589–1594 (1982). https://doi.org/10.1007/BF02644799

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  • DOI: https://doi.org/10.1007/BF02644799

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