Investigation of local brittle zone in multipass welded joint of NiCrMoV steel with heavy section

2018 ◽  
Vol 33 (8) ◽  
pp. 923-934 ◽  
Author(s):  
Yifei Li ◽  
Zhipeng Cai ◽  
Kejian Li ◽  
Jiluan Pan ◽  
Xia Liu ◽  
...  
Keyword(s):  
Welded Joint ◽  
Heavy Section ◽  
Nicrmov Steel ◽  
Brittle Zone ◽  
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Abstract

Study on fracture toughness of 617 Ni-based alloy welded joint under different elevated temperatures

2020 ◽  
Vol 35 (14) ◽  
pp. 1790-1802
Author(s):  
Yuan Gao ◽  
Chendong Shao ◽  
Haichao Cui ◽  
Ninshu Ma ◽  
Fenggui Lu
Keyword(s):  
Fracture Toughness ◽  
Elevated Temperatures ◽  
Welded Joint ◽  
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Abstract

Investigation on creep behavior of welded joint of advanced 9%Cr steels

2014 ◽  
Vol 30 (2) ◽  
pp. 197-205 ◽  
Author(s):  
Donghai Meng ◽  
Fenggui Lu ◽  
Haichao Cui ◽  
Yuming Ding ◽  
Xinhua Tang ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Welded Joint ◽  
Cr Steels ◽  
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Abstract

scholarly journals Effect of Long-term Service on Microstructure and Mechanical Properties of NiCrMoV Steel Welded Joint

2019 ◽  
Vol 269 ◽  
pp. 03012
Author(s):  
Manjie Fan ◽  
Peng Wang ◽  
Qixing Sun
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Welded Joint ◽  
Welding Process ◽  
Turbine Rotor ◽  
Optical Microscope ◽  
Turbine Plant ◽  
Nicrmov Steel ◽  
Service Conditions

The influences of prolonged service on microstructure evolution and mechanical properties of NiCrMoV steel welded joint in an ex-service welded steam turbine rotor were investigated. The welded rotor had been operated for 22 years since 1991. The specimens for the present study were taken from the location where the temperature was as high as 230°C. The optical microscope (OM) showed that even after long-term service, there were no obvious defects such as creep cavities, cracks found in the microstructure of the whole welded joint after such a long term service. The microstructure was uniform and no obvious grain coarsening was observed. However some black strip-shaped zones were found in base metal and heat affected zone (HAZ). The distribution of hardness across the welded joints showed no anomalies. The results of tensile strength and fracture toughness tests demonstrated that the welded joint still exhibited excellent. Mechanical performance after long-term service, indicating that the welding process of Shanghai Turbine Plant was reliable and stable. With the improvement of forging and welding qualities and improved heat treatment furnaces with more accurately controlled temperature, it is reasonable to assume that the current large low-pressure (LP) welded rotors are definitely safe to operate under similar service conditions for designed life.

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

2016 ◽  
Vol 31 (2) ◽  
pp. 292-301 ◽  
Author(s):  
Chendong Shao ◽  
Fenggui Lu ◽  
Zhuguo Li ◽  
Yan Cai ◽  
Peng Wang ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Welded Joint ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
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Abstract

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