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Acta Metallurgica Sinica (English Letters)

, Volume 32, Issue 5, pp 638–650 | Cite as

Creep Behavior and Life Assessment of a Novel Heat-Resistant Austenite Steel and Its Weldment

  • Yu Zhang
  • Hong-Yang Jing
  • Lian-Yong XuEmail author
  • Yong-Dian Han
  • Lei Zhao
  • Xi-Shan Xie
  • Qiu-Hua Zhu
Article
  • 84 Downloads

Abstract

In the present study, creep activation energy for rupture was obtained as 221–348 kJ/mol for 22Cr15Ni3.5CuNbN due to the precipitation-hardening mechanism. The extrapolation strength of creep rupture time of 105 h at 923 K for 22Cr15Ni3.5CuNbN is more valid (83.71 MPa) predicted by the Manson–Haferd method, which is superior to other commercial heat-resistant steels. The tensile creep tests ranging from 180 to 240 MPa at 923 K were conducted to investigate creep deformation behavior of welded joint between a novel heat-resistant austenite steel 22Cr15Ni3.5CuNbN and ERNiCrCoMo-1 weld metal. Apparent stress exponent value of 6.54 was obtained, which indicated that the rate-controlled creep occurred in weldment during creep. A damage tolerance factor of 6.4 in the weldment illustrates that the microstructural degradation is the dominant creep damaging mechanism in the alloy. Meanwhile, the welded joints perform two types of deformation behavior with the variation in applied stress, which resulted from the different parts that govern the creep processing. Also, the morphology evolution of the fracture surfaces confirms the effects of stress level and stress state.

Keywords

Heat-resistant steel weldment Creep deformation Life assessment TTP (time–temperature parametric) method 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51475326) and the Demonstration Project of National Marine Economic Innovation (No. BHSF2017-22). The authors also wish to acknowledge the supplier of the steel and welded joint: China Jiangsu Wujin Stainless Steel Pipe Group Co., Ltd.

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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Yu Zhang
    • 1
    • 2
  • Hong-Yang Jing
    • 1
    • 2
  • Lian-Yong Xu
    • 1
    • 2
    Email author
  • Yong-Dian Han
    • 1
    • 2
  • Lei Zhao
    • 1
    • 2
  • Xi-Shan Xie
    • 3
  • Qiu-Hua Zhu
    • 4
  1. 1.School of Materials Science and EngineeringTianjin UniversityTianjinChina
  2. 2.Tianjin Key Laboratory of Advanced Joining TechnologyTianjinChina
  3. 3.School of Materials Science and EngineeringUniversity of Science and Technology, BeijingBeijingChina
  4. 4.Jiangsu Wujin Stainless Steel Pipe Group Co., LtdChangzhouChina

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