Effect of Chemical Composition and Heat Treatment upon Impact Toughness of High Tensile Mn-Si Steels-Report II

Abstract

V-Charpy impact tests of high tensile manganese-silicon steels were performed over a range of temperature to investigate the effects of normalizing and silicon content on notch toughness.
The conclusions may be summarized as follows :
(1) The improvements in transition temperatures were considerable for silicon-aluminum killed steels, whereas only appreciable for silicon killed steels, K1B, K4B and K4T.
(2) The values of 15 ft-lb transition temperature of silicon-aluminum killed steels were approximately independent of silicon content in a range of 0.30 to 0.60%.
(3) The ductility of test steels, namely elongation and reduction of area in tensile test, was improved considerably by normalizing, whereas the yield point and tensile strength remained almost unaffected.