METALLURGICAL VARIABLES AFFECTING FRACTURE TOUGHNESS IN HIGH-STRENGTH SHEET ALLOYS.
Rept. for 15 Mar 61-14 Sep 62,
MANLABS INC CAMBRIDGE MASS
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Using precracked Charpy tests supplemented by center-notched tensile tests, the fracture toughness of five low-alloy and three stainless steel high-strength alloys in sheet form was measured primarily as a function of heat treat ment variables such as austenitizing and temper ing temperatures. The low alloy steels studied were D6AC two heats4340 martensitic and bainitic conditions, X200 0.35 and 0.40 carbon, 300M and H11 and the stainless steels were AM 355, PH 15-7Mo and 301. For 4340, in the bainitic condition, the influence of sub sequent deformation and aging on fracture tough ness was also determined. I addition, pre liminary studies of the effect of welding both before and after heat treatment on the toughness of H11, 300M and 4340 were carried out. Author