DH36高强船板钢CCT曲线及针状铁素体形成研究

发布时间：2018-04-24 09:08

  本文选题：DH钢 + CCT曲线　； 参考：《热加工工艺》2017年24期

【摘要】：采用Linseie L78 RITA淬火/相变热膨胀仪测定了DH36高强度船板钢的相变点,绘制了连续冷却转变曲线。通过光学显微镜和显微硬度法分析了冷却速率对相变组织演变规律及对针状铁素体形成的影响。结果表明:冷却速率0.5~3℃/s时,转变产物为多边形铁素体和珠光体;冷却速率5~10℃/s时,转变产物为大量针状铁素体和少量贝氏体,珠光体消失;冷却速率15~100℃/s时,转变产物主要由粒状贝氏体和铁素体组成,并开始形成板条马氏体,随冷速的增加其显微硬度呈增大趋势。5~7℃/s的冷却速率范围是获得针状铁素体的最佳冷速区间,在7℃/s冷速下,观察到了Al-Si-Ti-O-S-Mn系复合夹杂物所诱发的呈发散状多维形核的晶内针状铁素体。
[Abstract]:The transformation point of DH36 high strength shipboard steel was measured by Linseie L78 RITA quenching / phase change thermal expansion instrument, and the continuous cooling transformation curve was drawn. The effect of cooling rate on the evolution of phase transformation and the formation of acicular ferrite was analyzed by means of optical microscope and microhardness method. The results show that the transition products are polygonal ferrite and pearlite at cooling rate of 0.5 ~ 3 鈩，

本文编号：1796018