金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 135-138.DOI: 10.13251/j.issn.0254-6051.2020.01.027

• 材料研究 • 上一篇    下一篇

C-HRA-3耐热合金850 ℃持久性能及组织特征

陈正宗1, 刘正东1, 董陈1, 包汉生1, 张鹏2, 韩魁2, 高佩3   

  1. 1. 钢铁研究总院 特殊钢研究所, 北京 100081;
    2. 抚顺特殊钢股份有限公司, 辽宁 抚顺 113006;
    3. 江苏银环精密钢管有限公司, 江苏 无锡 214200
  • 收稿日期:2019-06-25 出版日期:2020-01-25 发布日期:2020-04-03
  • 作者简介:陈正宗(1986—),男,高级工程师,主要从事电站用耐热材料研发及工程应用研究,E-mail:czz1223@126.com。
  • 基金资助:
    国家重点研发计划(2017YFB0305203);科技基金课题(17T61120A)

Stress rupture properties and microstructure characteristic of C-HRA-3 heat-resistant alloy at 850 ℃

Chen Zhengzong1, Liu Zhengdong1, Dong Chen1, Bao Hansheng1, Zhang Peng2, Han Kui2, Gao Pei3   

  1. 1. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China;
    2. Fushun Special Steel Shares Co., Ltd., Fushun Liaoning 113006, China;
    3. Jiangsu Yinhuan Precision Steel Tube Co., Ltd., Wuxi Jiangsu 214200, China
  • Received:2019-06-25 Online:2020-01-25 Published:2020-04-03

摘要: 研究了C-HRA-3耐热合金在850 ℃持久试验过程的碳化物特征。结果表明:当持久应力为120 MPa时,持久寿命为37.8 h,主要析出相包括M23C6相和Ti(C, N)相,高应力状态下,M23C6相沿变形带析出。当持久应力为80 MPa时,持久寿命延长至491 h,晶界处M23C6相部分回溶,导致晶界特征不明显,同时细小M23C6相重新析出,晶内析出的Ti(C, N)相尺寸增加。不同应力下试样的断裂方式均为沿晶断裂,裂纹源优先在尺寸较大的析出相(M23C6和Ti(C, N))周围萌生,导致伸长率随持久寿命延长而减小。

关键词: C-HRA-3耐热合金, 持久试验, 碳化物

Abstract: The carbide characteristics of C-HRA-3 heat-resistant alloy during the creep rupture test at 850 ℃ were studied. The results show that when the stress is 120 MPa, the rupture time is 37.8 h. The main precipitated phases are M 23 C 6 and Ti (C, N) phase. Under high stress condition, M 23 C 6 phase precipitates along the deformation zone. When the stress is 80 MPa, the rupture time is prolonged to 491 h, the Ti (C, N) in inter-granular grows and coarsens, and the M 23 C 6 phase at the grain boundary partially dissolves, resulting in the indistinct grain boundary characteristics and the re-precipitation of the fine M 23 C 6 phase. The fracture modes of specimens under different stress condition are inter-granular fracture, and the crack source preferentially sprouts around the larger precipitates (M 23 C 6 and Ti (C, N) ), resulting in the decrease of the elongation of the rupture section with the extension of the rupture time.

Key words: C-HRA-3 heat-resistant alloy, creep rupture test, carbide

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