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An AISI 1018 steel was rolled various amounts between 0 and 50 percent, after which it was partially stress relieved, and the following properties measured: smooth tensile, Charpy V-notch versus test temperature, fracture toughness, stress corrosion cracking susceptibility, and fatigue crack growth rate.
The yield strength was increased almost three-fold by rolling, and the upper-shelf Charpy V-notch toughness was reduced to approximately one third its unrolled value. The fracture toughness was only moderately changed, and the crack growth rate in fatigue (da/dN) unchanged by rolling. There was no subcritical crack growth in distilled water on sustained loading to KI values just less than KIC for periods up to 64 h; however, da/dN in distilled water was higher than its dry value if fatigue loading was slow.
fracture properties, steels, cold working, fatigue (materials), toughness, yield strength
Director of Research, Materials Research Laboratory, Inc., Glenwood, Ill.