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Effect of Cooling Rate on SCC Susceptibility of β-Processed Ti–6Al–4V Alloy in 0.6M NaCl Solution

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Abstract

The effects of cooling rate on the stress corrosion cracking (SCC) susceptibility of β-processed Ti–6Al–4V (Ti64) alloy, including BA/S specimen with furnace cooling and BQ/S specimen with water quenching, were investigated in 0.6M NaCl solution under various applied potentials using a slow strain rate test technique. It was found that the SCC susceptibility of β-processed Ti64 alloy in aqueous NaCl solution decreased with fast cooling rate, which was particularly substantial under an anodic applied potential. The micrographic and fractographic analyses suggested that the enhancement with fast cooling rate was related to the random orientation of acicular α platelets in BQ/S specimen. Based on the experimental results, the effect of cooling rate on the SCC behavior of β-processed Ti64 alloy in aqueous NaCl solution was discussed.

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Acknowledgements

This work has been supported by the Engineering Research Center (ERC) Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0030801), and the National Research Foundation of Korea (NRF) grant funded by the Korean Government (NRF-2016H1D2A2916874). This work was also supported by the Industrial Technology Innovation Program (10050561, Forming, Post-treatment and Assembly Manufacturing Technology for Nozzle Fairing of 17,700 lbs Supersonic Engine) funded by the Ministry of Trade, industry and Energy(MI, Korea), and the Fundamental Research Program of the Korea Institute of Materials Science (KIMS).

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  1. Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University, **ju, 52828, Republic of Korea

    Soo** Ahn, Jiho Park, Daeho Jeong, Hyokyung Sung & Sangshik Kim

  2. Department of Materials Processing, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Yongnam Kwon

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  1. Soo** Ahn
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  2. Jiho Park
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Correspondence to Sangshik Kim.

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Ahn, S., Park, J., Jeong, D. et al. Effect of Cooling Rate on SCC Susceptibility of β-Processed Ti–6Al–4V Alloy in 0.6M NaCl Solution. Met. Mater. Int. 24, 327–336 (2018). https://doi.org/10.1007/s12540-018-0031-9

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