郑亚风,沈承金,李杰

• 1:中国矿业大学材料与物理学院
• 2:振石集团东方特钢有限公司

摘要(Abstract)：

采用热膨胀仪测定不同Al含量(0、0.77和1.43 mass%)的H11热挤压模具钢的等温转变曲线，并结合光学显微镜分析Al元素对H11钢等温转变过程及组织演变、珠光体转变动力学以及等温转变曲线(TTT曲线)的影响。结果表明：Al对贝氏体等温转变的温度范围没有明显的影响；随着Al含量增加，试验钢的珠光体转变温度范围逐渐增大，Al含量为0、0.77和1.43 mass%的试验钢的珠光体转变温度范围分别为：660～760℃、685～810℃和735～860℃。3种钢的Avrami指数均在3～4范围内，其中含Al钢Avrami指数略大于无Al钢，说明在珠光体鼻尖温度上下3种钢的珠光体均能在三维方向长大，且含Al钢的珠光体比无Al钢的珠光体更易球化。TTT曲线表明，随着Al含量的升高，贝氏体相变和珠光体相变的孕育期显著缩短，相变速率明显增大，TTT曲线向左上方移动。

关键词(KeyWords)： H11钢;Al含量;等温转变;TTT曲线

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(52274401)

作者(Author): 郑亚风,沈承金,李杰

DOI: 10.13289/j.issn.1009-6264.2024-0278

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