共析鋼のパーライトのラメラー間隔および配向度に及ぼす合金元素の影響

抄録

Many researches about the effect of alloy elements on the pearlite structure and strengthening by the fiber structure have been made. However, no systematic research on it is available in the literature. Therefore, we have made a systematic research on the pearlite lamellar spacing and the morphology.
(1) The effect of alloy elements on the eutectoid transformation temperature (ACT), pearlite transformation finish time (FTT), pearlite lamellar spacing (LPS) and degree of regularity of pearlite (LPA) depend on each alloy element. The effect cannot be explained by the periodic table reasonably.
(2) Almost an the elements enlarge FTT except Co and Ta.
(3) The effects of the alloy elements on LPS are divided into four groups approximately: \ding172 narrowing, \ding173 widening, \ding174 not changing, and \ding175 widening in the case of a small addition, but narrowing in the case of a large addition.
(4) The higher the transformation temperature, the larger is LPA. Almost all the elements make LPA smaller except Co and Ni.
(5) The C. Zener’s formula holds good in the relationship between the transformation temperature and pearlite lamellar spacing.
(6) The relationship between LPS and pearlite hardness is simillar to the Hall-Petch expression. The elements which dissolve in ferrite cause the solid solution hardening except the above expression.
(7) From the results mentioned above, it is estimated that the combination of the elements of narrowing LPS, the elements of making LPA larger and the elements of strengthening ferrite which do not make FTT larger extremely and do not make LPA smaller greatly is effective for producing higher-strength commercial wires.