Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (3): 220-224.DOI: 10.11890/1006-7191-113-220

• 研究论文 • 上一篇    下一篇

Microstructural Evolution and Change in Hardness during Creep of NF709 Austenitic Stainless Steel

赵艳1,赵杰2   

  1. 1. 大连理工大学材料学院
    2. 大连理工大学材料科学与工程学院 邮编116024
  • 收稿日期:2010-12-01 修回日期:2011-02-22 出版日期:2011-06-25 发布日期:2011-06-13
  • 通讯作者: 赵杰

Microstructural evolution and change in hardness during creep of NF709 austenitic stainless steel

Yan ZHAO1, Jie ZHAO1, Xiaona LI2   

  1. 1. School of Material Science and Engineering, Dalian University of Technology, Dalian 116085, China
    2. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116085, China
  • Received:2010-12-01 Revised:2011-02-22 Online:2011-06-25 Published:2011-06-13
  • Contact: Jie ZHAO

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Abstract: Microstructural evolution and the change in hardness during creep deformation of NF709 austenitic stainless steel were investigated. Creep tests were carried out at 650 ℃ for 2932 h under a load of 210 MPa for comparison with aging specimen at 650 ℃ for 3000~h. The hardness results indicated that applied stress during creep process induced hardness increase. Analysis of longitudinal section microstructure showed that the creep damage caused by pores and the grain boundary hardening caused by elongated grains could be the factors leading to hardness differences. The G phase dispersedly precipitated in intragranular and interacted with dislocations during creep process, indicating strain hardening.

Key words: NF709, Creep-introduced, Hardness, Microstructural evolution