[Table of Contents]

Plasma and Fusion Research

Volume 8, 1405166 (2013)

Regular Articles

Effect of Yttrium Addition on Mechanical Properties for V-4Cr-4Ti Alloy Contaminated with Oxygen and Nitrogen Impurities
Takeshi MIYAZAWA, Takuya NAGASAKA1), Yoshimitsu HISHINUMA1), Takeo MUROGA1), Yanfen LI2), Yuhki SATOH2), Sawoong KIM3) and Hiroaki ABE2)
The Graduate University for Advanced Studies, Toki, Gifu 509-5292, Japan
1)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
2)
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
3)
National Fusion Research Institute, Daejeon 305-806, Korea
(Received 27 June 2013 / Accepted 19 October 2013 / Published 27 December 2013)

Abstract

Reduction of interstitial impurities such as nitrogen (N) and oxygen (O) improves the mechanical properties of V-4Cr-4Ti alloys. Yttrium (Y) addition effectively reduces O content by Y2O3 slag-out on the melting ingot surface. The effects of Y addition on mechanical properties were investigated for V-4Cr-4Ti with N ranging from 0.009 to 0.29 mass% and O ranging from 0.009 to 0.36 mass%. The increase in yield stress (YS) and ultimate tensile stress (UTS) for vanadium alloys was saturated above 0.1 mass% in O content, because Ti precipitates increased with increasing O content regardless of Y addition. Y addition had little effect on YS and UTS of V-4Cr-4Ti alloys at room temperature (RT). However, Y addition improved impact properties of alloys highly doped with O. Y addition did not suppress hardening due to O doping but did increase deformation for crack initiation.

Keywords

low-activation material, blanket structural material, solid solution hardening

DOI: 10.1585/pfr.8.1405166

Full Text

PDF format (2.5Mbytes) PDF Download

References

  • [1] T. Muroga, Comprehensive Nuclear Materials 4, 391 (2012).
  • [2] D.L. Harrod et al., International Metals Reviews 25, 163 (1980).
  • [3] J.F. Smith, Phase Diagrams of Binary Vanadium Alloys (ASM International, 1989).
  • [4] D.L. Smith et al., J. Nucl. Mater. 135, 125 (1985).
  • [5] T. Kainuma et al., J. Nucl. Mater. 80, 339 (1979).
  • [6] M.L. Grossbeck et al., J. Nucl. Mater. 258, 1369 (1998).
  • [7] T. Nagasaka et al., J. Nucl. Mater. 367, 823 (2007).
  • [8] T. Nagasaka et al., Fusion Technol. 39, 659 (2001).
  • [9] T. Nagasaka et al., J. Plasma Fusion Res. SERIES 5, 545 (2002).
  • [10] N.J. Heo et al., J. Nucl. Mater. 307, 620 (2002).
  • [11] T. Nagasaka et al., Fusion Eng. Des. 61, 757 (2002).
  • [12] N.J. Heo et al., J. Nucl. Mater. 325, 53 (2004).
  • [13] T. Miyazawa et al., J. Nucl. Mater. 442, S341 (2013).
  • [14] T. Nagasaka et al., Fusion Eng. Des. 81, 307 (2006).
  • [15] Chemical Handbook (the Chemical Society of Japan, 2004) [in Japanese].
  • [16] T. Chuto et al., J. Nucl. Mater. 326, 1 (2004).

This paper may be cited as follows:

Takeshi MIYAZAWA, Takuya NAGASAKA, Yoshimitsu HISHINUMA, Takeo MUROGA, Yanfen LI, Yuhki SATOH, Sawoong KIM and Hiroaki ABE, Plasma Fusion Res. 8, 1405166 (2013).