肖桂枝,杨继学,安茹,马金磊,麻衡

• 1:西安建筑科技大学冶金工程学院
• 2:莱芜钢铁集团银山型钢有限公司

摘要(Abstract)：

利用扫描电镜、透射电镜、拉伸和冲击试验机等研究了不同调质处理工艺对1000 MPa级水电用钢微观组织和力学性能的影响。结果表明：淬火后的实验钢组织呈准等轴状，板条马氏体组织细小。在890～950℃淬火温度范围内，随着淬火温度的升高，马氏体板条束尺寸增加，经过620℃回火后组织转变为回火索氏体，回火过程中碳化物的析出及其与位错的交互作用提高了实验钢的强度。随淬火温度升高，实验钢的屈服强度和抗拉强度增加，伸长率基本保持不变，-60℃冲击吸收能量呈现先缓慢增加后急剧减小的趋势，冲击断裂方式由韧性断裂转变为脆性解理断裂。经920℃×30 min+620℃×60 min调质工艺处理后，实验钢的屈服强度、抗拉强度、伸长率及-60℃冲击吸收能量分别为970 MPa、986 MPa、15%和185 J,其综合力学性能达到最优，满足1000 MPa级水电用钢的性能要求。

关键词(KeyWords)： 水电用钢;调质处理;微观结构演化;力学性能;强化机理

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51804241)

作者(Author): 肖桂枝,杨继学,安茹,马金磊,麻衡

DOI: 10.13289/j.issn.1009-6264.2023-0541

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