J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2552-2558.DOI: 10.1016/j.jmst.2019.04.032

• Orginal Article • Previous Articles     Next Articles

Deformation behaviors of as-built and hot isostatically pressed Ti-6Al-4V alloys fabricated via electron beam rapid manufacturing

Liu Z.ab, Zhao Z.B.a*(), Liu J.R.a*(), Wang L.a, Zhu S.X.a, Yang G.c, Gong S.L.c, Wang Q.J.a, ang R.Ya   

  1. aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230000, China
    cAvic Manufacturing Technology Institute, Beijing, 100024, China
  • Received:2018-12-20 Revised:2019-03-18 Accepted:2019-04-10 Online:2019-11-05 Published:2019-10-21
  • Contact: Zhao Z.B.,Liu J.R.
  • About author:

    1The authors equally contributed to this work.

Abstract:

The deformation behavior of as-built and hot isostatically pressed (HIP) Ti-6Al-4 V alloys fabricated using electron beam rapid manufacturing (EBRM) were investigated in this work. The deformation characteristics were characterized using a laser scanning confocal microscope and electron back-scattered diffraction (EBSD). In the as-built sample, prismatic slip was the main mode of deformation, as well as a small amount of basal slip and cross-slip. Some planar slip lines with large length scales were observed across several α lamellae. After hot isostatical pressing, prismatic and basal slip were the main mode of deformation, accompanied by abundant cross-slip and multiple slip, and most of the slip lines were blocked within an α lamellae. These differences in deformation behavior were associated with the coarsening of α laths and the more retained β phase after HIP compared to the as-built alloy. More cross-slip and multiple slip can lead to superior elongation-to-failure and a greater strain hardening effect in the HIP alloy compared to the as-built sample.

Key words: Electron beam rapid manufacturing, Ti-6Al-4V, Hot isostatic pressure, Mechanical properties, Slip behavior