PC 鋼線の温間矯直とリラクセーション特性の改善
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概要
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Various properties of high-carbon PC wire treated by cold-straightening and bluing ("CS+B") and those by warm-straightening ("WS") were compared and the following results obtained. It was found that the greater the bending deviation during straightening, the straighter was the processed wire and the more stable was the torsion value. There was an increase in the diameter of the wire in the "CS" process and in the "WS" process at intermediate temperatures, but it was found that at higher temperatures the diameter reached a maximum and then gradually decreased, becoming less than the original diameter above 400℃. The maximum tensile stength and sectional-hardness were obtained for "CS+B" wire when treated at 200℃ and 250℃ respectively, while for "WS" wire the maximum values were obtained at 300℃. The "WS" wire had a lower stress-relaxation value than "CS+B" wire, this being paricularity evident at high auto-clave temperatures. One reason may be that the "WS" wire has a higher elastic limit than "CS+B" wire. Minimum relaxation values for both "CS+B" wire and "WS" wire were obtained at a temperature approximately 50℃ above that at which σ_<0.2> and σ_<0.02> showed a maximum and this corresponded with the results of creep tests performed at intermediate temperatures. It is considered that in the "WS" process the dislocations increase and there are repeated lockings of these dislocations by solute atoms and that the composite effect of aging and process hardening results in a fixed structure of dislocations.
- 社団法人日本鉄鋼協会の論文
- 1977-01-01
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関連論文
- PC 鋼線の温間矯直とリラクセーション特性の改善
- 254 PC 鋼線の温間矯直とレラクセーション特性の改善(鋼線・熱処理・変態・焼入性, 加工・性質・分析・検査・計測, 日本鉄鋼協会第 84 回(秋季)講演大会)
- 三機工業株式会社(第 6 班, 第 57 回講演大会工場見学記)
- 運輸技研(第 6 班, 第 57 回講演大会工場見学記)