Abstract
An investigation has been made of the effect of heating to, and cooling from, a temperature above the critical range on the mechanical properties of an alloy steel to specification B.S. En 29.
It has been shown that, on rapid cooling from a temperature above the critical range, the steel possessed poor mechanical properties (low yield and tensile strengths) at all temperatures down to the commencement of martensite formation at about 300 deg. C. (572 deg. F.). Below this temperature, there was a sudden increase in yield and tensile strengths, accompanied by a marked decrease in ductility.
The relation between these mechanical properties and the incidence of cracking after repeated heating and rapid cooling is briefly discussed.
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