Siを添加したPbおよびPb合金の研究（第4報）時効について

Abstract

A number of experimental results have been published already about aging of lead alloys. Since the author systematically studied on the lead and lead-antimony alloys with added silicon for explanation of their in aging as cast, as-rolled and as-extruded in room temperature, and some characteristics of aging of these alloys were found to be shown by addition of silicon to lead and lead-antimony alloys. In general, the hardness of lead alloys were increased by addition of silicon both as-cast and as-worked. The experimental results were as follows: (1) Age hardening was observed in as-cast lead-silicon and lead-antimony-silicon alloys, and the more the contents of antimony and silicon were increased, the more effective the age hardening. The increasing rate of hardness on stabilized state was observed remarkably in the range of 0.008∼0.017% silicon on lead-silicon alloys, and in the raage of 0.3∼1.0% antimony in lead alloys containing silicon. (2) Age hardening was observed in as-rolled lead-silicon alloys in the range of 10∼20% draft, and the more the silicon contents were increased, the more the hardening. Age softening was observed on lead-silicon alloys in over 30% drtaft, and no distinct change of hardness was of served in over 30% draft in spite of silicon contents. Age softening was observed in as-rolled lead-antimony silicon alloys, and decreasing rate of hardness was observed remarkably in under 20% draft, and the more the draft, the more the decrease in hardness. Age softening was observed in as 90% extruded lead-silicon and leadsilicon-antimony alloys in spite of antimony and silicon contents.