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C-Mn超细晶钢控轧控冷工艺的研究
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摘要
本文结合国家重点基础研究发展计划项目(973计划)“新一代钢铁材料的重大基础研究”和国家高技术发展计划项目(863计划)—“500MPa碳素钢先进工业化制造技术”,以普通C-Mn钢为对象,通过热模拟实验、实验室热轧实验,对C-Mn超细晶钢控轧控冷工艺进行了研究。主要工作包括:
     1.在Gleeble 2000热模拟试验机上进行了SS400钢未变形及变形量为55%的热模拟试验,分别绘制了860℃未变形以及变形条件下的连续冷却转变曲线(CCT曲线),对不同条件下的金相显微组织进行了分析。通过研究发现奥氏体变形促进了铁素体相变,在细化铁素体晶粒的同时,也增加了铁素体的百分含量。变形提高了形成贝氏体的冷却速度,抑制了贝氏体的形成。
     2.利用Gleehle 1500热模拟试验机,以鞍山ANS400钢为对象,通过双道次压缩变形研究了冷却速度和变形温度对实验钢组织性能的影响。通过单道次压缩变形研究了变形量对钢材组织性能的影响。同时对不同温度双道次压缩变形后的淬火组织进行了观察。
     3.以鞍钢ANS400和ANS500钢为对象,通过实验室轧制实验研究了加热温度、开轧温度、轧后冷却速度及卷取温度对钢材组织性能的影响。并对试样的精细组织进行了观察。为工业生产提供了理论依据。
     4.在实验室研究基础之上,以鞍钢ANS400和ANS500钢为对象,在鞍钢进行工业实验,达到预期目标。在鞍钢现有生产设备条件下,能够实现400MPa级和500MPa级超级钢生产。
The works of this paper were carried out integrating with the 973 project of The Major Basic Research For New Generation Steel Materials and the 863 project of The Advanced Industrial Manufacture Technology Of 500MPa Carbon Steel. Hot
    simulation experiments and hot rolling experiments of C-Mn steel were carried out in laboratory, controlled rolling and controlled cooling of the C-Mn super-fine grain steel were investigated. The main works involved as follows:
    1. The experiments ofSS400 steel were made at the Gleeble 2000 thermo-mechanical simulator in austenite without deformation and 55% compressive deformation with the different deformation pass. The continuous cooling transformation (CCT) curves were constructed in austenite without deformation and 55% compressive deformation at 860
    ℃ .Microstructures in different condition were analy/.ed. Found austenite deformation accelerated ferrite transformation, refined ferrite grain size while increased the fraction of ferrite. Deformation increases the cooling rate of formed bainite and restrained the form of bainite.
    2. The double-hit compress experiments of ANS400 steel were made at the Gleeble 1500 thermo-mechanical simulator, the influence of cooling rate and deformation temperature on property of tested steel. Single pass compress deformation studied the influence of deformation amount on property of tested steel. The quenching microstructures at different temperature in double-hit compress experiments were observed.
    3. Hot rolling experiments of ANS400 steel and ANS500 steel were carried out in laboratory, the influence of heated temperature, rolling temperature, cooling rate and coiling temperature on the property of tested steel. TEM microstructures were observed. Theory basis were given to industrial production.
    
    
    
    Abstract
    4. On the basis of laboratory studies, industry trials of ANS400 steel and ANS500 steel were carried out in Ansteel and the expected goals were reached. Realized to produce 400MPa and 500MPa super steel in condition of present equipment in Ansteel.
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