Crack growth behavior, fracture mechanism, and microstructural evolution of G115 steel under creep–fatigue loading conditions

Tang, Zifan; Jing, Hongyang; Chi, Dazhao; Zhao, Lei; Han, Yongdian; Xiao, Bo; Li, Haizhou; Dan, Wu

doi:10.1016/j.ijmecsci.2019.105037

Cited by 10 publications

(4 citation statements)

References 52 publications

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“…Up to now, the suitable and mature materials and the matched welding materials for advanced USC power plants have not been developed. Simultaneously, the USC power plants with operational temperature increasing to 620°C–630°C will be established to fulfill the stringent demands of environmental pollution 5–8 . Due to the superior performances, such as the excellent creep property and resistance to corrosion, P92 steel still is the candidate material for manufacturing main steam pipes, superheat pipes, and reheat pipes in USC power plant equipment with higher operational temperature 9–12 .…”

Section: Introductionmentioning

confidence: 99%

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Zhao

Han

et al. 2020

Fatigue Fract Eng Mat Struct

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Considering the flexible operation conditions, the creep‐fatigue performance of P92 steel plays a crucial role in manufacturing structural components of ultra‐supercritical fossil power plants at 620°C–630°C. The creep‐fatigue interaction tests of P92 steel were conducted at 630°C in air with different duration periods, where the duration periods were simultaneously added on the peak tensile strain and valley compressive strain. The addition of hold time resulted in a rapid decrease of fatigue life, where the reduction amplitude increasing with the hold time. There was more than five times reduction as the hold time increased to 300 s. Moreover, the stress relaxation behavior during hold time exhibited a saturation behavior at long dwell time, where the limited relaxed stress gradually approached to the creep threshold stress. Furthermore, a modified strain energy density exhaustion model involving creep threshold stress was proposed and provided more accurate predictions in comparison with the conventional model, reducing the conservatism.

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Section: Introductionmentioning

confidence: 99%

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Zhao

Han

et al. 2020

Fatigue Fract Eng Mat Struct

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“…The yield strength and hardness of WNZ are superior to those of the BM, indicating that the mechanical properties mainly depend on the dislocation density. Furthermore, It is important to note that cracks tend to grow along paths with low resistance and high energy, which means they mainly propagate through deformed grains 62 . The WNZ contains a high proportion of low‐energy sub‐structured grains and low‐strain recrystallized grains, which significantly increases its resistance to crack propagation during early stages.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, It is important to note that cracks tend to grow along paths with low resistance and high energy, which means they mainly propagate through deformed grains. 62 The WNZ contains a high proportion of low-energy sub-structured grains and low-strain recrystallized grains, which significantly increases its resistance to crack propagation during early stages. As a result, the WNZ shows significant improvement in fatigue crack propagation resistance under cyclic loads.…”

Section: Strengthening Mechanism Of Wnzmentioning

confidence: 99%

“…7,11 Compared to conventional P92 steel, the 9Cr3W3Co steel offers various improvements by replacing Mo with W, adjusting B and N proportions, and introducing Cu for enhanced precipitation strengthening. 12,13 Extensive research has been conducted on this steel's microstructure and mechanical properties, including heat treatment impact on strength, 9,10 microstructure evolution and toughness, 7,8 tensile deformation behaviors, 14 crack growth behaviors, [15][16][17] low cycle fatigue properties, 18 and creep properties. 12,19,20 These studies provide compelling evidence that the 9Cr3W3Co steel has the potential to meet modern ultra-supercritical (USC) steam turbine requirements.…”

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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Effect of force ratio on creep-fatigue crack growth (CFCG) of P91 steel

et al. 2022

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Crack growth behavior, fracture mechanism, and microstructural evolution of G115 steel under creep–fatigue loading conditions

Cited by 10 publications

References 52 publications

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

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

Effect of force ratio on creep-fatigue crack growth (CFCG) of P91 steel

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