Creep rupture properties and microstructures of 9Cr–3Co–3W-Nd-B steel welded joints

Hamaguchi, Tomoaki; Kurihara, Shinnosuke; Hirata, Hiroyuki; Okada, Hideya

doi:10.1016/j.msea.2021.142231

Cited by 10 publications

(9 citation statements)

References 14 publications

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Section: The 9% Cr Steelsmentioning

confidence: 99%

“…The SAVE12AD steel is the new 9% Cr steel, additionally alloyed by Nd and Ta, developed by Nippon Steel of Sumitomo Metal Corporation, Japan for large diameter and heavy wall thickness pipes and forgings of fossil-fired power boilers [5,[34][35][36]. The SAVE12AD is presented in works of Hamaguchi et al [34,35]. This steel was designed as an improvement on 11% Cr steel, SAVE12 (0.1C-11Cr-3W-3Co-V-Nb-Ta-Nd-N, in mass %) [37], by decreasing the Cr content from 11 to 9% in order to enhance the long-term creep strength.…”

Section: The 9% Cr Steelsmentioning

confidence: 99%

“…This steel was designed as an improvement on 11% Cr steel, SAVE12 (0.1C-11Cr-3W-3Co-V-Nb-Ta-Nd-N, in mass %) [37], by decreasing the Cr content from 11 to 9% in order to enhance the long-term creep strength. The steel is alloyed by 0.03 wt.% Nd to improve ductility and suppress creep rupture through suppressing the S segregation [36]. Concentrations of B and N are reported to be 0.01 wt.% B and 0.01 wt.% N, corresponding to the range 70-150 ppm B and 50-150 ppm N [36].…”

Section: The 9% Cr Steelsmentioning

confidence: 99%

“…The steel is alloyed by 0.03 wt.% Nd to improve ductility and suppress creep rupture through suppressing the S segregation [36]. Concentrations of B and N are reported to be 0.01 wt.% B and 0.01 wt.% N, corresponding to the range 70-150 ppm B and 50-150 ppm N [36].…”

Section: The 9% Cr Steelsmentioning

confidence: 99%

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9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Dudova

2022

Metals

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As a promising alloying approach, the modification of chemical composition by increasing the B content and decreasing the N content has been applied to improve the creep resistance of various 9–12% Cr heat-resistant martensitic steels. This paper presents an overview of the creep strength and related microstructural features of the 9% Cr and 10–12% Cr martensitic steels with high B and low N contents. The factors that determine the optimal B/N ratio in steels are considered. The creep properties are compared with those for similar steels with conventional B and N contents. The relationships between the stability of lath structure and precipitates of M23C6, Laves, and MX phases and the creep strength of steels are considered. Further perspectives of this modification of alloying by high boron and low nitrogen are outlined.

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Section: The 9% Cr Steelsmentioning

confidence: 99%

Section: The 9% Cr Steelsmentioning

confidence: 99%

Section: The 9% Cr Steelsmentioning

confidence: 99%

Section: The 9% Cr Steelsmentioning

confidence: 99%

See 2 more Smart Citations

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Dudova

2022

Metals

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“…Isik et al [ 15 ] found that the Laves phase had a significant effect on both the microstructure and creep properties and was regarded as detrimental to creep strength. HORIUCHI et al showed the size of M23C6 particles changes considerably during long-term aging or creep, and therefore has a significant effect on subgrain size, while MX size remains essentially constant, so the effect of aging on creep deformation is mainly caused by changes in M23C6 particle size [ 16 , 17 ]. Zhao et al [ 18 ] revealed the microscopic mechanism of creep fracture 9Cr-3W-3Co heat-resistant steel under creep conditions at 650 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Long-Term Thermal Aging on Microstructure Evolution and Creep Deformation Behavior of a Novel 11Cr-3W-3Co Martensite Ferritic Steel

et al. 2022

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This paper focused on the microstructure evolution under different thermal aging times at 650 °C and its effect on creep behavior in 11Cr-3W-3Co heat-resistant steel. After short-term thermal aging at 650 °C (>750 h), a Laves phase was found in the regions adjacent to the PAG boundaries, martensitic lath boundaries, and M23C6 carbides, and gradually swallowed adjacent M23C6 carbides with the aging time increased. Higher contents of Si and P are good promoters of the nucleation of the Laves phase during long-term aging. In addition, the coarsening behavior of the Laves phase, M23C6, and MX were investigated. As the aging time increases, the coarsening behavior among precipitated phases in the above-mentioned example exhibits remarkable variability, which is discussed in detail in this paper, and the evolution of the subgrain size was also analyzed in detail. The increasing rate of subgrain size is, in general, consistent with that of the M23C6 carbide size. The evolution of dislocation density in different aging times shows an obvious difference, and the decreasing rate of dislocation density is significantly affected by the precipitated phase after long-term aging time. The creep performance of the material decreases significantly as the aging time increases, which is closely related to the coarsening of the precipitates such as M23C6 carbides and subgrain during long-term aging.

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A study on as-welded microstructure and mechanical properties of thick-walled 9Cr3W3Co1CuVNbBN martensitic steel weldment

Han,

Wang,

et al. 2023

International Journal of Pressure Vessels and Piping

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Creep rupture properties and microstructures of 9Cr–3Co–3W-Nd-B steel welded joints

Cited by 10 publications

References 14 publications

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

9–12% Cr Heat-Resistant Martensitic Steels with Increased Boron and Decreased Nitrogen Contents

Effect of Long-Term Thermal Aging on Microstructure Evolution and Creep Deformation Behavior of a Novel 11Cr-3W-3Co Martensite Ferritic Steel

A study on as-welded microstructure and mechanical properties of thick-walled 9Cr3W3Co1CuVNbBN martensitic steel weldment

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