刘恒太,王梓为,曾燕屏,蔡文河,董树青,杜双明

• 1:北京科技大学材料科学与工程学院
• 2:中国大唐集团科学技术研究院有限公司火力发电技术研究院

摘要(Abstract)：

采用光学显微镜、扫描电镜、透射电镜以及力学性能测试等研究了2Cr11Mo1NiWVNbN钢在700℃下长期时效过程中显微组织和力学性能的演变，以及该钢在540℃下的应力松弛性能。结果表明：2Cr11Mo1NiWVNbN钢经正火及回火后具有典型的回火马氏体组织，组织中存在大量细小的M_(23)C_6和MX相。M_(23)C_6相主要呈细棒状、长条状和不规则块状，而MX相则主要呈细小的类椭球状。在高温时效过程中不仅马氏体板条会显著变宽，严重碎化，而且M_(23)C_6相会严重粗化，析出相数量趋于减少，致使钢的硬度和强度不断降低，这种变化在时效初期尤为显著。另外，2Cr11Mo1NiWVNbN钢在540℃下的应力松弛性能欠佳，应力松弛幅度较大，由其制备的螺栓在服役一段时间后需要检修。

关键词(KeyWords)： 2Cr11Mo1NiWVNbN钢;高温时效;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘恒太,王梓为,曾燕屏,蔡文河,董树青,杜双明

DOI: 10.13289/j.issn.1009-6264.2021-0613

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