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Stress Induced Fracture Transition in High-Temperature 9% Cr–CrMoV Dissimilar Welded Joint

  • Tao Wei
  • Kai DingEmail author
  • Bingge Zhao
  • Yuanheng Zhang
  • Guanzhi Wu
  • Yuanfang Wang
  • Yu Lai GaoEmail author
Conference paper
  • 593 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The creep behavior and microstructure of 9% Cr–CrMoV dissimilar welded joints were investigated in the present study. The results showed that the fracture occurred in the CrMoV-HAZ under 150 MPa at 839 K with necking, yet transformed to the fusion line under 120 MPa without obvious necking. The life of the sample ruptured under 150 MPa was 2512 h, while the sample ruptured under 120 MPa was 8041 h. The microhardness of the base metal of 9% Cr was ~275 HV, and the zone adjacent to the fusion line exhibited the highest hardness value (~320 HV). Numerous voids formed at the grain boundaries during the stress rupture test. The second particles at the grain boundaries acted as the initiation sites of the voids. In summary, the precipitation and coarsening of the second phase particles on grain boundaries were deemed as the crucial factors to result in this fracture mode transition.

Keywords

Fracture transition Stress rupture Dissimilar welded joint Initiation site second phase particles 

Notes

Acknowledgements

The authors gratefully acknowledge the National Natural Science Foundation of China (Grant no. U1760102), the financial support by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and Shanghai Science and Technology Committee (Grant no. 13DZ1101502).

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringCenter for Advanced Solidification Technology (CAST), Shanghai UniversityShanghaiPeople’s Republic of China

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