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Effect of microstructure on creep and creep crack growth behaviour of titanium alloy

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Abstract

Creep and creep crack growth behaviour of a near α titanium alloy has been investigated at 600°C which is affected by primary α content. The alloy was heat treated at different temperatures so as to obtain different levels of equiaxed primary α in the range from 5 to 24 %. Constant load creep tests were carried out at 600°C in the stress range 250 to 400 MPa till rupture of the specimens. Creep crack growth tests were carried out at 600°C. Creep data reveals with increase in primary α content leads to creep weakening. On similar lines maximum creep crack growth resistance is associated with the alloy with lowest primary α content. Microstructural and fractographic examination has revealed that creep fracture occurs by nucleation, growth and coalescence of microvoids nucleated at primary β / transformed β (matrix) interfaces. On the other hand, creep crack growth occurs by surface cracks nucleated by fracture of primary α particles as well as by growth and coalescence of microvoids nucleated at primary β / transformed β (matrix) interfaces in the interior of the specimen.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    C. M. Omprakash, D. V. V. Satyanarayana & Vikas Kumar

Authors
  1. C. M. Omprakash
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  2. D. V. V. Satyanarayana
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  3. Vikas Kumar
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Correspondence to C. M. Omprakash.

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Omprakash, C.M., Satyanarayana, D.V.V. & Kumar, V. Effect of microstructure on creep and creep crack growth behaviour of titanium alloy. Trans Indian Inst Met 63, 457–459 (2010). https://doi.org/10.1007/s12666-010-0064-3

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  • DOI: https://doi.org/10.1007/s12666-010-0064-3

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