Abstract
Specimens of plain carbon steels with an increasing lamellar pearlite proportion equivalent to the carbon content were investigated in tension tests, comparing uncharged specimens with hydrogencharged ones. Yield strength and tensile strength increasing with the C-content are scarcely changed after charging; fracture strain and especially reduction of area were reduced. Fractures developed in uncharged specimens with a carbon content higher than 0.4% in a nearly circular resp. elliptical shape from the centre and after charging semielliptically or semicircularly from the surface of the specimens. Both were characterized by a stable crack propagating poor in ductility. Fracture-mechanics data resulted in nearly similar K 1 -values for both charged and uncharged conditions
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