This is a type of thermomechanical processing method for steel, in which the steel is plastically processed in a supercooled austenite state, followed by quenching and tempering. The high-strength, tough steel obtained in this way is used for automobile springs, rocket engine cases, etc. The supercooled austenite state refers to the state that occurs when alloy steel, made by adding carbon, silicon, nickel, molybdenum, etc. to iron, is heated to 850-900°C to form austenite, and then rapidly cooled to between 450-600°C. In this case, the metastable austenite structure persists for more than several tens of minutes. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
過冷却オーステナイト状態で塑性加工した後,焼入れ‐焼戻しを行うという,鋼の加工熱処理法の一つ。これによって得られる,強度が高く靱性(じんせい)のよい鋼は,自動車のばね,ロケットエンジンのケース等に使用される。過冷却オーステナイト状態とは,鉄に炭素,ケイ素,ニッケル,モリブデン等を添加した合金鋼を850~900℃に加熱してオーステナイト化した後,450~600℃の間に急冷したときの状態をいい,この場合には数十分以上にわたって準安定状態のオーステナイトの組織が存続する。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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