Analysis of Fracture Surface Using X-ray Micro-Diffractometer (Report 2)

Investigation on Fracture Surface after Fracture Toughness Test

Abstract

Fracture toughness test was performed on the specimens of SS41 steels including different amount of Ti, which were heat treated using a synthetic thermal cycle apparatus. The streched zone widths on the fracture. surfaces measured using SEM were in proportion to J, values. Plastic strain in the region of the streched zone obtained using X-ray micro-diffractometer was the largest of all the strains obtained. The maximum plastic strains thus obtained increased in proportion to Jc values. Consequently, it would be concluded from this result that the plastic strain in the region of the streched zone obtained by X-ray corresponds to the true fracture strain arising at crack tip.