Welding technologies for advanced ultra-supercritical power plants materials

Sorrentino, S.

doi:10.1016/b978-0-08-100552-1.00018-x

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…[22][23][24][25] Meanwhile, the narrow-gap submerged arc welding (NG-SAW) technique is frequently employed because of its high deposition rate. 26,27 NG-SAW has been confirmed as suitable for manufacturing large-size rotors by Wu et al, while Wang et al highlighted the combination of multi-layer multi-pass welding technique and NG-SAW technique for connecting thick turbine rotor alloys. 23,24 However, during the welding process of thick welded joints, non-uniform thermal cycles can cause microstructure evolution that significantly influences joint mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

“…The multilayer multi‐pass arc welding process is commonly utilized for thick rotor materials due to its high efficiency and quality 22–25 . Meanwhile, the narrow‐gap submerged arc welding (NG‐SAW) technique is frequently employed because of its high deposition rate 26,27 . NG‐SAW has been confirmed as suitable for manufacturing large‐size rotors by Wu et al, while Wang et al highlighted the combination of multi‐layer multi‐pass welding technique and NG‐SAW technique for connecting thick turbine rotor alloys 23,24 .…”

Section: Introductionmentioning

confidence: 99%

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Comparison in microstructure, mechanical properties, and fatigue behavior of 9Cr3W3Co turbine rotor steel and its welded joint

Mai,

Liu,

Chen

et al. 2024

Fatigue Fract Eng Mat Struct

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The microstructure, mechanical properties, and high/very‐high cycle fatigue behaviors of 9Cr3W3Co turbine rotor steel and its welded joint were investigated. The welded nugget zone (WNZ) exhibited the highest microhardness value, followed by the heat‐affected zone (HAZ), while the base material (BM) showed the lowest hardness value. The WNZ exhibited a higher yield strength compared to the BM with reduced elongation, while maintaining similar ultimate tensile strength. The fatigue strength of the BM at 5 × 107 cycles is roughly 53.7% of the yield strength, whereas that of the WNZ increases to approximately 55.0%. In comparison to the fatigue strength of the BM at 5 × 107 cycles, the WNZ exhibits a notable increase of 10.5%. Smaller grain size and higher dislocation density were observed in the WNZ, which contributed to improved microhardness, yield strength, and fatigue resistance through grain boundary strengthening and dislocation hardening.

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