低炭素鋼の被削性に及ぼす合金元素の影響

概要

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Effects of alloying elements on the drillability of low carbon steels have been investigated. From the view point of the effects on the drillability of low carbon steels with normalized lamellar pearlite structures, alloying elements are classified into two groups as follows. (1) Elements represented by chromium which increase the pearlite fraction by lowering eutectoid carbon content and cause little solid solution hardening. (2) Elements represented by phosphorus which have little effect on the pearlite fraction but increase the hardness by solid solution hardening of ferrite. The first group elements largely increase the drillability and the second group ones have little effect on the drillability. These effects of alloying elements on the drillability are understood mainly as the net results of the benificial effect by decrease of the cutting force due to the contribution of pearlite on stress concentration and a negative effect by increase of the cutting force due to the increase of hardness. The effects of alloying elements on the drillability with spheroidized structures of cold drawn low carbon steels are also discussed with the effects due to decreased stress concentration by spheroidized pearlite and the effect due to hardness.
社団法人日本鉄鋼協会の論文
1974-07-01