SEDL / STP / STP559-EB / STP38592S

Fracture Properties of a Cold-Worked Mild Steel

Ripling, EJ
Director of Research, Materials Research Laboratory, Inc., Glenwood, Ill.

Pages: 15    Published: Jan 1974

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Abstract

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 K^I values just less than K^IC for periods up to 64 h; however, da/dN in distilled water was higher than its dry value if fatigue loading was slow.