中炭素非調質鋼の靱性に及ぼすMn, Cr量の影響

概要

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The influence of carbon, manganese and chromium contents on the toughness of medium carbon microalloyed steels was investigated by an instrumented Charpy impact testing machine and by the microstructural observation with an electron microscope.The pearlite area fraction increases when carbon, manganese and chromium contents increase. On the other hand, increasing manganese and chromium contents simultaneously makes the interlamellar spacing of pearlite smaller. Chromium has larger effect than manganese in this respect.The hardness becomes higher and the toughness becomes lower when increasing the carbon content. However, in the case of manganese and chromium, both hardness and toughness are improved as far as the bainite structure does not appear. This phenomenon is related to the fact that manganese and chromium change the pearlite morphology and increase the crack initiation energy in the impact tests.Among the steel grades tested in this research, 1.1% manganese and 0.5% chromium is the best combination to get the highest toughness.
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