4.3. Results of X-ray diffraction characterization
X-ray diffraction patterns are obtained using Rigaku X-ray diffractometer with CuK radiation ( = 1.5406A˚ ) with 2 ranging from 10◦ to 80◦. Indexing of planes is done and the peaks are compared with the standard JCPDS (Joint Committee Powder Diffraction
Standards) values. Figs. 9 and 10 show the X-ray diffraction patterns of the base
metal and weld region, respectively. The line broadening of the diffraction peaks arises due to the particle size and strain present inside material. The X-ray diffraction spectra provide information on the crystal phase in the base metal. The tallest peak contains chromium silicate
in a cubical phase. Similarly the other peaks constitute either
hexagonal phase silicon carbide or cubical phase chromium silicate.
There are a few irregularities with no defined peaks indicating the
existence of impurity phases. A good crystalline nature is observed
in the base metal.
Similarly, the X-ray diffraction spectra (Fig. 5.39) provide information
on crystal phase in the weld region. The tallest peak contains