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Optimizing the hot-forging process parameters for connecting rods made of PM titanium alloy

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Abstract

In order to optimize the processing parameters of a new low-cost titanium alloy connecting rod made of powder forging, the deformation behavior of an α + β type Ti–1.5Fe–2.25Mo (wt%) alloy produced by elemental powder metallurgy (PM) route was studied using isothermal compression tests. The constitutive equations and a processing map were established to characterize the flow behavior and predict the optimum deformation parameters. The calculated apparent activation energy was 257.73 kJ/mol for deformation in the α + β phase region and 378.01 kJ/mol in the β phase region. Two deformation mechanism domains were found: α + β → β phase transformation and dynamic recrystallization. The results show that the optimum deformation parameters for the present alloy are (700–800 °C, 10−1.7–1 s−1) and (800–900 °C, 10−2–10 s−1). Based on these results, a finite element method (FEM) simulation of the hot-forming of a connecting rod was conducted, and the simulated results have been successfully used in an industrial forging of the connecting rod.

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Acknowledgements

The work was partially supported by Fundamental Research Funds for the Central Universities, Major State Basic Research Development Program of China (No. 2011CB605505), National High Technology Research and Development Program (No. 2008AA03A233), and Minister of Science & technology of China program (No. 2007BAE07B05).

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    J. W. Qiu, Y. Liu, Y. B. Liu & B. Wang

  2. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    B. Liu

  3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA

    Earle Ryba

  4. Northwest Institute for Nonferrous Metal Research, Xian, 710016, People’s Republic of China

    H. P. Tang

Authors
  1. J. W. Qiu
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  2. Y. Liu
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  3. B. Liu
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  4. Y. B. Liu
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  5. B. Wang
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  6. Earle Ryba
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  7. H. P. Tang
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Correspondence to Y. Liu.

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Qiu, J.W., Liu, Y., Liu, B. et al. Optimizing the hot-forging process parameters for connecting rods made of PM titanium alloy. J Mater Sci 47, 3837–3848 (2012). https://doi.org/10.1007/s10853-011-6239-4

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  • DOI: https://doi.org/10.1007/s10853-011-6239-4

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