On the Grain Growth of Lead due to Bending

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  • 鉛の曲げ加工による結晶粒成長
  • ナマリ ノ マゲ カコウ ニ ヨル ケッショウ リュウ セイチョウ

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Abstract

Lead recrystallizes at room temperature. Therefore lead cable sheath, when subjected to various bending strains in the course of its manufacture, often develops very large grains as its grains grow with recrystallization. The large grain size is not desirable for the lead sheath because of its unfavourable effect on the fatigue resistance. Moreover, bending strains some times cause a non-uniform structure of the sheath.<BR>In studying the grain growth of lead test pieces of 6.6×6.6 mm extruded square lead rods (99.98%) of different grain sizes were given 2%, 4%, and 6% bending strains at the bending temperature of 0°C or 30°C, and then heated for one hour at 100°C. Looking into the progress of the grain growth, it was the relationship between grain size before bending and grain growth rate was clarified, and an overall grain growth and a zoned structure in relation with bending strains was examined.<BR>The conclusion obtained from the above was as follows:<BR>(1) In case of the 0°C bending temperature, test pieces which were given 4% bending strain showed a large grain growth rate; the larger the original grain size, the smaller the rate. Under these strains, small-grain-size test pieces developed a zoned structure.<BR>(2) In case of the 30°C bending temperature, the test pieces given 2% bending strain had the largest grain growth rate. Those of small original grain size developed an overall grain growth first and then a zoned structure.

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