クロムモリブデン鋼の熱処理に関する研究 (第1報) : 表面脱炭層および熱処理条件の影響

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Rectangular specimens were machined from a Cr-Mo steel plate which was cold rolled with subsequent full annealing at 850℃. Various factors that affect the elongation of the specimen were investigated. These factors were as follows : 1) decarburized surface layer, 2) quenching temperature, 3) holding time at quenching temperature, 4) temperature of the quenching oil, 5) tempering temperature, 6) coloring temperature and time. The elongation of specimen was measured by using of a pench micrometer or a jig boring machine both having the precision of l0^<-3>mm. The obtained results were summerized as follows : (1) The decarburized surface layer has a great influence on the elongation of specimen after quenching. The decarburized specimen has the tendency to contract by quenching treatment while the nondecarburized specimen to expand. (2) The specimen shows the larger elongation (45〜5・7)×10<-3>mm/cm by heating at a higher temperature and keeping shorter time at the same temperature, and it shows the shorter elongation (1・1〜2・5)×10^<-3>mm/cm by heating at a lower temperature and keeping longer time at the same temperature. (3) Retained austenite seems to be almost zero in the quenched structure. (4) The quenched specimen shows the contraction by tempering treatment, and its value (7・9×l0^<-3>mm/cm) is almost constant and is independent of the existence or nonexistence of the decarburized layer. (5) The tempered specimen shows the contraction by coloring treatment, but its absolute value is very small when compared with that of the changes by quenching or tempering. (6) The average value of the contraction of specimen by the whole treatments is 4・4×10<-3>mm/cm. (7) Quite the same tendency was observed concerning the elongation of specimen either by using a pench micrometer or by a jig boring machine.
1958-02-15

クロムモリブデン鋼の熱処理に関する研究 (第1報) : 表面脱炭層および熱処理条件の影響

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