金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 55-59.DOI: 10.13251/j.issn.0254-6051.2020.06.012

• 工艺研究 • 上一篇    下一篇

正火冷速对2.25Cr-1Mo钢持久性能的影响

武志广1, 龚雪婷1, 李鑫1, 赵吉庆2, 韩少强2, 龚志华2   

  1. 1. 中国原子能科学研究院, 北京 102413;
    2. 钢铁研究总院 特殊钢研究所, 北京 100081
  • 收稿日期:2020-01-03 出版日期:2020-06-25 发布日期:2020-09-02
  • 通讯作者: 龚志华,副教授,硕士,E-mail:gzh_2001@163.com
  • 作者简介:武志广(1984—),男,高级工程师,硕士,主要研究方向为反应堆系统设计,E-mail:wuzg240@163.com。
  • 基金资助:
    国家重点研发计划(2016YFB0300203)

Effect of normalizing cooling rate on creep rupture property of 2.25Cr1Mo steel

Wu Zhiguang1, Gong Xueting1, Li Xin1, Zhao Jiqing2, Han Shaoqiang2, Gong Zhihua2   

  1. 1. China Institute of Atomic Energy, Beijing 102413, China;
    2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
  • Received:2020-01-03 Online:2020-06-25 Published:2020-09-02

摘要: 采用SEM、持久性能测试等手段,研究了不同正火冷速对2.25Cr-1Mo钢持久性能的影响。结果表明:当采用空冷、30 ℃/min、5 ℃/min冷却时,2.25Cr-1Mo钢在530 ℃的外推持久强度σ104均为120 MPa左右。当正火冷速降至1 ℃/min时,持久性能显著降低,主要因为此时在贝氏体-铁素体界面析出大量大颗粒析出物,导致蠕变孔洞产生;同时大量的先共析铁素体出现,基体强度降低,难以阻碍持久裂纹扩展,导致持久性能下降。

关键词: 2.25Cr-1Mo钢, 持久性能, 贝氏体, 铁素体

Abstract: Effect of different normalizing cooling rate on the creep rupture property of 2.25Cr-1Mo steel was studied by means of SEM and creep testing machine. The results show that the extrapolated creep strength σ104 under 530 ℃ of the 2.25Cr-1Mo steel normalized with air, 30 ℃/min and 5 ℃/min cooling rate are all about 120 MPa. The creep rupture strength decreases conspicuously when the cooling rate drops to 1 ℃/min, the main reason is a large number of big size particles precipitated on the interface of ferrite and bainite, which results in the occurrence of creep holes. Meanwhile, a large number of proeutectoid ferrite appears, which leads to the strength of the matrix decrease and can not effectively hinder cracks to propogate, thus the creep rupture property decreases.

Key words: 2.25Cr-1Mo steel, creep rupture property, bainite, ferrite

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