余宏伟,胡锋,董中波,吴开明,卜勇,王孝东

• 1:武汉科技大学耐火材料与冶金省部共建国家重点实验室
• 2:宝武集团鄂城钢铁有限公司
• 3:宝钢股份中央研究院

摘要(Abstract)：

利用光学显微镜、扫描电镜(SEM)、透射电镜(TEM)、能谱仪(EDS)和拉伸及冲击试验等研究了冷却速率对高强度桥梁钢微观组织、第二相形貌及力学性能的影响。结果表明：随着冷却速率的增加(1～50℃/s),试验钢的组织由块状铁素体+珠光体向粒状贝氏体、板条贝氏体转变，但均有M/A岛弥散分布于铁素体基体或边界上。当冷却速率大于5℃/s时，随着冷却速率的增加，贝氏体铁素体晶粒细化，M/A岛数量减少、尺寸细化，并更加弥散分布。组织中大角度晶界占比随着冷却速率的增加呈现先减少、后增加的变化。当冷却速率为1℃/s时，在铁素体+珠光体组织中，大量块状铁素体具有大角度取向差；在形成贝氏体组织的10～50℃/s冷却速率范围内，冷却速率的增加促进了大角度晶界(取向差角度>15°)的形成。冷却速率的增加，阻碍了Nb、Ti的碳氮化物析出，晶内析出相的形貌由粒状或不规则块状转变为细小针状和球形状。冷却速率在1～30℃/s的范围内增加时，试验钢的屈服强度和抗拉强度上升，伸长率下降，冲击吸收能量先上升后下降。

关键词(KeyWords)： 高强度桥梁钢;冷却速率;微观组织;析出相;柔性轧制工艺

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U20A20279);; 高等学校学科创新引智计划资助项目(111计划)

作者(Author): 余宏伟,胡锋,董中波,吴开明,卜勇,王孝东

DOI: 10.13289/j.issn.1009-6264.2022-0142

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