THE EFFECT OF THICKNESS AND TEMPERING TEMPERA TURE ON FRACTURE APPEARANCE TRANSITION TEMPERA TURE AND CRITICAL FRACTURE TOUGHNESS OF HIGH STRENGTH SHEET STEEL-PART I.
Final technical rept. no. 2,
AUBURN RESEARCH FOUNDATION ALA
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Fracture appearance transition temperature, OF H-11 steel was observed to decrease non linearly with decreasing sheet thickness for yield strengths of approximately 160, 200 and 240 ksi. The effect of decreasing sheet thickness was relatively more pronounced in depressing FATT than was the effect of increasing tempering temperature. Phenomena consisting of gross pin-hole deformation or bearing failure, rupture through the pin-hole area, formation of steps of flat fracture and asymmetrical fracture topography, frequently were observed for fracture toughness specimens of 160-ksi yield strength. Author