文档介绍：超高碳钢热轧过程中显微组织演变的热模拟研究摘要本文介绍了超细晶超高碳钢的发展及国内外研究现状,对其应用领域进行了展望。晶粒细化可以提高材料的强度和韧性, 是新一代钢铁材料研究与开发所追求的重要目标。在线控制并获得超细组织一直是材料科技工作者梦寐以求的目标。其中, 应变诱导相变及铁素体动态再结晶就是大量试验工作中总结出来的获得超细组织的有效方法。本试验利用 Gleeble - 1500 D 热模拟实验机对超高碳钢的晶粒形变细化机制进行了研究,通过改变变形温度和应变速率研究应变诱导相变的规律。从而得到超细晶超高碳钢。通过对超高碳钢热轧模拟实验的研究得到以下结论:超高碳钢在热轧过程中保持应变速率不变,改变轧制温度在 Accm 线以下时, 奥氏体转变量增加,而且温度越高,奥氏体转变的越多。超高碳钢在低温条件下进行热轧, 改变应变速率, 奥氏体体积分数不变且为零。在高碳钢热轧过程当中, 较高的温度、较低的应变速率有助于组织晶粒细化,而当温度比较低时,不利于组织的细化且此时应变速率的变化对晶粒度的影响也不明显。关键词: 应变诱导相变, 热轧, 奥氏体, 晶粒细化, 超细晶超高碳钢 Thermal Simulation Research on the Microstructure Evolution during the Hot Rolling P rocess of Ultra-high Carbon Steel ABSTRACT This paper introduced the development of ultra-high carbon steel and the research status at home and abroad, and predicted its application. Grain refinement can enhance material's strength and toughness. It is the important goal of the research on steel material. it is the dream goal of material research personnel to control and obtain ultra fine-grain m icrostructure inh otr olling,in which strain abduction phase- transition and ferrite dynamic recrystallizing is the effective methode of obtaining ultrafine-grain that is summarized from a great deal tests .T his test used Gleeble-1500D thermal simulation equipment to study the grain form- transition fine mechanism of Ultra-high Carbon Steel,the rule of strain abduction phase- transition was studied through changing the form-change temperature and strain speed,the ultra-fine grain ultra-high carbon steel was gained. These results were obtained from h otr olling simulation tests of ultra-high carbon steel:the change amount of austenitic increase d with temperature change under Accm when the strain speed is no change ,and the higher temperature wa s ,the more austenitic wa s, .the change of strain speed can not altered the volume fraction of austenitic ,it keep ed zero , when the h otr olling temperature was lower. It is favorableness for grain fine to keep higher temperature and lower strain speed in the hot-