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Role of stress in the high cycle fatigue behavior of advanced 9Cr/CrMoV dissimilarly welded joint

Published online by Cambridge University Press:  11 January 2016

Chendong Shao ,
Fenggui Lu ,
Zhuguo Li ,
Yan Cai ,
Peng Wang  and
Yuming Ding
Chendong Shao
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, People's Republic of China
Fenggui Lu*
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, People's Republic of China
Zhuguo Li*
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, People's Republic of China
Yan Cai
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, People's Republic of China
Peng Wang
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China
Yuming Ding
Affiliation:
Shanghai Key laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China; and Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai 200240, People's Republic of China
*
a) Address all correspondence to these authors. e-mail: Lfg119@sjtu.edu.cn
b) e-mail: lizg@sjtu.edu.cn
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Abstract

Narrow gap submerged arc welding method accompanied with multilayer and multipass technology was used to manufacture advanced 9Cr and CrMoV dissimilarly welded joint used as a newly developed turbine rotor. The aim of this investigation was to evaluate the high cycle fatigue (HCF) behavior of the welded joint at room temperature. Uniaxial-stress controlled HCF tests at stress ratio R = −1 were performed with specimens chipped from the welded joint of mockup and the S–N curve up to 1.0 × 108 cycle lifetime was obtained. It was found that the fracture location transferred from heat affected zone (HAZ) of CrMoV side to weld metal (WM) with decreasing stress amplitude. The microstructure of the welded joint was characterized and microstructure diversity was found to be responsible for the failure locations both in the CrMoV–HAZ and WM. Fracture morphology of failure samples were also investigated by a scanning electron microscope. It is detected that the stress amplitude required to drive the inclusion to be the crack initiation of the CrMoV–HAZ lies behind the transition. With decreasing stress amplitudes, void in the WM more easily tends to be the initiation of a fatigue crack than inclusion.

Keywords

high cycle fatiguedissimilarly welded jointfracture locationstress amplitudecrack initiation
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 2 , 28 January 2016 , pp. 292 - 301
Copyright
Copyright © Materials Research Society 2016 

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References

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