INFLUENCE ON THERMAL AND STRAIN CYCLING ON FRACTURE SUSCEPTIBILITY OF MILD STEEL.
ILLINOIS UNIV URBANA DEPT OF CIVIL ENGINEERING
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The principal fracture controlling parameters and the effects of welding thereon are discussed. From the results of tests on notched and welded specimens it was apparent that the effect on fracture behavior of the thermal and strain cycling that occurs during welding is not fully understood. Notched bend specimens subjected to a cycle of axial prestraining at temperatures usually in the range of 300 to 800F were tested to evaluate the fracture behavior of three structural steels, ABS-C, A212-B, and A441 steels. It was found that cracking occurred in some of the hotstrained specimens of ABS-C and A212-B steels at loads as low as 87 percent of the yield load when they were tested at temperatures of -80 of 80F. One specimen of A441 steel also exhibited cracking at 88 percent of the yield load at a temperature of -40F, but in most cases the hot-strained A441 steel specimens showed greater resistance to fracturing than those of the other two steels. Some of the notched bend specimens of the ABS-C steel exhibited cracking during the axial prestraining at a temperature in the range of 300 to 600F. Similarly, cracking occurred during welding at the root of notches in some of the notched and welded specimens of ABS-C steel. Specimens which cracked during hot-straining are apparently less susceptible to fracturing at low applied loads.
- Properties of Metals and Alloys