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Korean Journal of Metals and Materials > Volume 55(3); 2017 > Article
Korean Journal of Metals and Materials 2017;55(3): 150-155. doi: https://doi.org/10.3365/KJMM.2017.55.3.150
The Effect of Al and V on Microstructure and Transformation of β Phase during Solution Treatments of Cast Ti-6Al-4V Alloy
Seong-Tak Oh1, Kee-Do Woo1,*, Jae-Hwang Kim2,*, Seung-Mi Kwak1
1Division of Advanced Material Engineering & RCAMD, Chonbuk National University, Jeonju 54896, Republic of Korea
2Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology, Jeonju 54853, Republic of Korea
Correspondence  Kee-Do Woo ,Tel: +82-63-270-2299, Email: kdwoo@jbnu.ac.kr
Jae-Hwang Kim ,Tel: +82-63-270-2299, Email: raykim@kitech.re.kr
Received: 24 May 2016;  Accepted: 8 September 2016.  Published online: 3 March 2017.
ABSTRACT
In this study, the effect of α and β those stabilizers on the microstructure and phase transformation of cast Ti-6wt%Al-4wt%V alloy at various solution treatment temperatures was investigated. The dependence of the transformation behavior of the β phase during the solution treatment and its dependence was determined by the partitioning of α and β stabilizing elements. Solution treatments were conducted at 850 ~ 1050 ℃ for 0.5 h and, followed by water quenching. Aging treatments at 550 ℃ for 24 h were then performed. The α' martensite was transformed from the β phase when the concentration of vanadium in the β phase was less than 4.27 at%, while the metastable β phase did not transform to α' martensite when the concentration of vanadium in the β phase was over 5.14 at%.
Keywords: metals, annealing, microstructure, hardness test, stabilizer
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