孔昌昌,秦凤明,张晓峰,党淑娥,陈慧琴

• 1:太原科技大学材料科学与工程学院
• 2:太原重工轨道交通设备有限公司技术中心

摘要(Abstract)：

在Gleeble-3800热模拟机上测定了含微量Mo元素CL60钢在不同冷却速度下连续冷却时的膨胀曲线,并采用金相-硬度法,测定了该钢的连续冷却转变曲线(CCT曲线),研究了冷却速度对其显微组织演变以及硬度的影响。结果表明:当冷却速度小于1℃/s时,实验钢的转变产物为先共析铁素体和珠光体组织;当冷却速度增加到2℃/s时,开始发生贝氏体转变;当冷却速度增加到5℃/s时,开始发生马氏体转变;冷却速度在5～10℃/s的范围内时,转变产物为少量铁素体、珠光体、贝氏体和马氏体所组成的混合组织;当冷却速度为15℃/s时,先共析铁素体消失;当冷却速度为20～40℃/s时,转变产物为珠光体和马氏体混合组织;当冷却速度大于50℃/s时,转变产物全部为马氏体组织。随着冷却速度的增大,实验钢的硬度逐渐增大。尽管Mo元素的加入能细化珠光体片间距,但加Mo元素CL60钢在生产过程中得到理想组织的条件更加苛刻。为避免贝氏体、马氏体等非理想组织出现,不同部位的冷却速度须严格控制在2℃/s以下。

关键词(KeyWords)： CL60钢;膨胀法;金相-硬度法;CCT曲线

Abstract:

Keywords:

基金项目(Foundation): 山西省重点研发计划重点项目(201703D111005);; 山西省科技攻关计划(工业)项目(201603D121006-2)

作者(Author): 孔昌昌,秦凤明,张晓峰,党淑娥,陈慧琴

DOI: 10.13289/j.issn.1009-6264.2019-0096

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