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首页> 美国政府科技报告 >Semi-Annual Progress Report (1st) on Development of Superplastic Steel Processing. A Joint R and D Effort between Industry and a National Laboratory: Caterpillar Inc., Peoria, IL; Ladish Co., Inc., Cudahy, WI; North Star Steel Company, Monroe, MI; Lawrence Livermore National Laboratory, Livermore, CA
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Semi-Annual Progress Report (1st) on Development of Superplastic Steel Processing. A Joint R and D Effort between Industry and a National Laboratory: Caterpillar Inc., Peoria, IL; Ladish Co., Inc., Cudahy, WI; North Star Steel Company, Monroe, MI; Lawrence Livermore National Laboratory, Livermore, CA

机译：关于超塑钢加工发展的半年度进展报告（1）。工业与国家实验室之间的联合研发工作：卡特彼勒公司，伊利诺伊州皮奥里亚; Ladish Co.，Inc.，Cudahy，WI;北极星钢铁公司，monroe，mI;劳伦斯利弗莫尔国家实验室，加利福尼亚州利弗莫尔

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The influence of aluminum content and thermomechanical processing steps in developing fine microstructures in ultrahigh carbon steels (UHCS) was examined. It was shown that ultrafine pearlitic structures, containing no proeutectoid carbide networks, can be obtained by the addition of at least 1.5% aluminum. Hot-working (HW) followed by slow cooling from the austenite region (above A/sub cm/) will lead to a carbide-network-free pearlitic structure. Spheroidized structures, with the elimination of any pre-existing carbide networks, can be obtained either by a thermomechanical treatment or by a thermal treatment alone. These are: (1) warm working (WW) involving a divorced-eutectoid transformation with associated deformation (DETWAD), and (2) heat treating involving a divorced-eutectoid transformation (DET), which requires heating to a low austenitizing temperature followed by isothermal transformation just below the A sub 1 temperature. This retardation will provide a wide window of time and temperature for processing with a number of possible combinations of DET and DETWAD steps. Results of superplasticity studies on the UHCS-Al alloys reveal that superplastic behavior is enhanced by aluminum additions and by increasing the amount of deformation during DETWAD processing. Preliminary studies on the cold-rolling characteristics of the UHCS-1.6Al alloy reveal that it can be cold-rolled to 50% in the fully pearlitic condition without annealing, and to over 60% in the fully spheroidized condition. A modified Fe-C diagram is proposed for the UHCS-1.6Al. Aluminum is shown to raise the liquidus and solidus temperatures, to increase the solubility of carbon in austenite, to increase the A sub 1 temperature, and to introduce a three-phase region of ferrite, austenitic, and carbide. (ERA citation 14:015172)

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