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首页> 外文期刊>Materials Science and Engineering >Identification of the parameters controlling the grain refinement of ultra-rapidly annealed low carbon Al-killed steels
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Identification of the parameters controlling the grain refinement of ultra-rapidly annealed low carbon Al-killed steels

机译：确定控制超快退火低碳铝镇静钢晶粒细化的参数

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摘要

Ultra-rapid annealing (URA) cycles were used in order to refine the microstructure of cold-rolled low carbon Al-killed steel sheets. It was shown that the degree of grain refinement is controlled by the parameters (heating and cooling rates, annealing temperature) of the URA cycles and by the size, distribution and number of iron carbides formed during the coiling of these steels. In order to obtain a strong refinement, four conditions have to be fulfilled: (i) the initial microstructure of the steels before annealing has to be composed of numerous iron carbides finely distributed in the ferritic matrix, (ii) intercritical annealing leading to the formation of about 80% of austenite has to be performed, (iii) the heating rate (R_H) has to be higher than 500℃/s and (iv) the cooling has to be rapid between 800 and 650 ℃. From a microstruc-tural point of view, the grain refinement is the result of three phenomena: (i) the inhibition of the grain growth of the primary ferrite grains by the iron carbides (below A_(C1)) and by the austenite nuclei resulting from these carbides (above A_(C1)), (ii) the development of the austenite grains above A_(C1) and (iii) the γ → a transformation during cooling.
机译：为了改善冷轧低碳铝镇静钢板的显微组织，使用了超快速退火（URA）循环。结果表明，晶粒细化程度由URA循环的参数（加热和冷却速率，退火温度）以及这些钢卷取过程中形成的碳化铁的尺寸，分布和数量控制。为了获得良好的细化效果，必须满足四个条件：（i）退火前钢的初始组织必须由许多细分散在铁素体基体中的碳化铁组成；（ii）临界退火导致形成大约80％的奥氏体必须进行，（iii）加热速率（R_H）必须高于500℃/ s，并且（iv）必须在800至650℃之间快速冷却。从微观结构的角度来看，晶粒细化是三种现象的结果：（i）碳化铁（低于A_（C1））和由此产生的奥氏体核抑制了初级铁素体晶粒的晶粒长大从这些碳化物（在A_（C1）以上），（ii）在A_（C1）之上形成奥氏体晶粒，以及（iii）冷却过程中的γ→相变。

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  • 来源
    《Materials Science and Engineering》 |2010年第22期|P.5654-5663|共10页
  • 作者

    V. Massardier; A. Ngansop; D. Fabregue; J. Merlin;

  • 作者单位

    University of Lyon, 1NSA Lyon, MATE1S-UMR 5510, Bat. B. PASCAL, 7 avenue]. Capelle, F69621 Villeurbanne Cedex, France;

    University of Lyon, 1NSA Lyon, MATE1S-UMR 5510, Bat. B. PASCAL, 7 avenue]. Capelle, F69621 Villeurbanne Cedex, France ADEME, 20 Avenue du Cresilli, BP90406,49004 Angers Cedex 01, France;

    University of Lyon, 1NSA Lyon, MATE1S-UMR 5510, Bat. B. PASCAL, 7 avenue]. Capelle, F69621 Villeurbanne Cedex, France;

    University of Lyon, 1NSA Lyon, MATE1S-UMR 5510, Bat. B. PASCAL, 7 avenue]. Capelle, F69621 Villeurbanne Cedex, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    annealing; recrystallisation; phase transformation; grain refinement; ferritic steels;

    机译：退火;重结晶相变晶粒细化铁素体钢;

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