Residual Stress Estimation of Ti Casting Alloy by X-ray Single Crystal Measurement Method


Recently, titanium casting teclmology attracts attention in tile industrial fields. These casting metals are
including a various residual stresses due to the heat shrinkage and inclusion particles, et a!. In order to apply the casting
teclmology, the accurate estimation of residual stresses is desired in many cases. In iliis study, it aims at the
nondestructive stress evaluation of titanium casting material by the X-ray stress measurement teclmique. At first in this
study, the sin21Jf method which used in the usual X-ray stress measurement was tried to measure the residual stresses.
However, it was unsuitable for measurement of titanium casting material because of including coarse grains. Therefore,
another X-ray method for single crystal system was employed to coarse crystal grains, in order to investigate the
possibilities of residual stress estimating. Four-axes sample table which can set tile both of tilt angle and rotate one on
the sample surface was prepared. The stereographic diagrams and the theory of elasticity were used to measure tl1e
single crystal stresses on the sample surface.
Keywords: Titanium (Ti), X-ray, residual stress measurement, casting alloy. A. Shirol, M. Nishida2, T. ling3
IAdvanced Course of Mechanical System engineering, Kobe City College of Technology, Kobe 651-2194, Japan
2Department of Mechanical engineering, Kobe City College of Technology, Kobe 651-2194, Japan
3School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China