邱国兴,张红钊,杨永坤,李小明,彭雷朕,曹磊

• 1:西安建筑科技大学冶金工程学院
• 2:二重(德阳)重型装备有限公司
• 3:河北工业职业技术大学材料工程系

摘要(Abstract)：

采用光学显微镜、扫描电镜(SEM)、透射电镜(TEM)和力学性能测试等研究了经中间热处理的含钇和钛的低活化钢在550℃时效500、1250、2500、4000和5000 h后的组织和性能变化规律，并分析了微观组织变化对力学性能的影响。结果表明：时效过程中实验钢的组织保持为稳定的马氏体，晶粒发生粗化，M_(23)C_6和MX相的长大速率、屈服强度、抗拉强度和冲击性能逐渐降低并趋于稳定。时效时间增加至4000 h后，Laves相的粗化速度有所降低。当时效时间达到5000 h时，实验钢的晶粒尺寸为9.1μm, M_(23)C_6的长大速率为0.0072 nm/h, MX的长大速率为0.0004 nm/h,实验钢的室温屈服强度和抗拉强度分别为632和755 MPa,室温冲击吸收能量为307 J,韧脆转变温度为-64℃,实验钢在650℃时屈服强度和抗拉强度分别为313和337 MPa。晶粒粗化是实验钢冲击韧性降低的主要原因。

关键词(KeyWords)： 低活化钢;高温时效;Laves相;M_(23)C_6;MX;力学性能

Abstract:

Keywords:

基金项目(Foundation): 河北省自然基金(E2021417001);; 中国博士后科学基金(2022M720982);; 陕西省自然基金(2021JQ-502)

作者(Author): 邱国兴,张红钊,杨永坤,李小明,彭雷朕,曹磊

DOI: 10.13289/j.issn.1009-6264.2023-0028

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