Fim observation of 2.25CrlMo steel

Wada, M.; Hosoi, Koichi; Nishikawa, Osamu

doi:10.1016/0001-6160(82)90208-5

Cited by 14 publications

(2 citation statements)

References 11 publications

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“…This can be attributed mainly to the higher Mo content (it is more than double that in 2101), since Mo forms Mo-N cluster that decreases the diffusivity of N to the grain boundaries. [16,17] In addition, in this steel, the precipitates are close to the a/c grain boundaries and inside the austeinitic grain, as shown in Figure 3. This result shows that the precipitation was followed by the formation of secondary austenite, [12,15] as confirmed by the results of the image analysis that indicate an increase in the austenite content in the case of aging at 750°C and 850°C.…”

Section: A Microstructuresmentioning

confidence: 60%

Effect of Aging on the Fracture Behavior of Lean Duplex Stainless Steels

Straffelini

Baldo

Calliari

et al. 2009

Metall Mater Trans A

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The influence of aging in the range of 550°C to 850°C for 5 to 120 minutes on the impact fracture behavior of 2101 and 2304 lean duplex stainless steels (DSS) was investigated in the present study. The 2304 steel displayed ductile behavior irrespective of aging conditions. In contrast, the 2101 steel displayed a ductile behavior only in the case of aging for 5 minutes at 550°C and 650°C, whereas in all other cases, it fractured in a brittle manner. The brittle fracture behavior of the 2101 steel has been attributed to the precipitation of small black particles at the a/a and a/c grain boundaries (nitrides), which form paths for easy crack propagation. In the 2304 steel, such particles precipitated at 750°C and 850°C, but they were located inside the austenitic grains because of the formation of secondary austenite. They therefore did not embrittle the steel. The larger Ni content of the 2304 steel favored the formation of the secondary austenite that is absent in the 2101 steel.

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Section: A Microstructuresmentioning

confidence: 60%

Effect of Aging on the Fracture Behavior of Lean Duplex Stainless Steels

Straffelini

Baldo

Calliari

et al. 2009

Metall Mater Trans A

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“…It is not considered that the cause of increasing surface hardness is Mo carbides. Wada et al17 reported Mo‐C clusters and Murayama et al9 showed Mo‐interstitial atom clusters by three‐dimensional atom probe in austenitic steels. It becomes easy for carbon atom to diffuse the octahedral sites of γ ‐Fe in increasing the content of Mo addition.…”

Section: Resultsmentioning

confidence: 99%

Acceleration of Carbon Diffusion by Molybdenum in Low-Temperature Plasma Carburizing of Austenitic Stainless Steel

Tsujikawa

Noguchi

Yamauchi

et al. 2007

Plasma Process. Polym.

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Surface hardening of austenitic stainless steel without degradation of corrosion resistance has been a subject of continuing interest in the field of surface of engineering technology. In this paper, we elucidate a hardening mechanism, changing the amount of the molybdenum (Mo). Three austenitic stainless steel were used in the present work, AISI304 (0.21%‐Mo), AISI316 (2.34%‐Mo), and AISI317L (3.13%‐Mo). Samples were plasma carburized using a DC plasma apparatus under 667 Pa of mixed gas flow of 5%CH4 + 45%H2 + 50%Ar at 673 K or 723 K for various durations. The surface hardness increased by increasing the amount of the Mo. The lattice constant after carburizing also increased with increasing Mo contents. These results indicate that carbon super saturation was enhanced by the effect of large Mo atoms, which can widen the octahedral sites.

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Grain Boundary Segregation Behavior in 2.25Cr-1Mo Steel During Reversible Temper Embrittlement

Islam

2007

J of Materi Eng and Perform

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Low alloy steels serving for a long time at high temperature, e.g., around 500°C, are very sensitive to temper embrittlement due to segregation of various trace elements at prior austenite grain boundaries and/ or carbide/matrix interfaces. This type of segregation in combination with various environmental effects can adversely affect the fracture resistance and fatigue crack propagation rate with subsequent change in fracture morphology of low alloy steels. This article describes the segregation behavior of various elements in 2.25Cr-1Mo pressure vessel steel investigated by AES, FEG-STEM, SEM, and EDS analyses. As confirmed by AES and FEG-STEM, phosphorus is found to be the main embrittling element for isothermal embrittlement. Sulfur and Mo segregation is only evident after longer embrittlement times. In the stepcooling embrittlement, phosphorus is still found to be the main embrittling element, but heavy segregation of sulfur in some isolated intergranular facets was also observed. For P segregation, a Mo-C-P interaction is observed, while sulfur segregation is attributed to site competition between sulfur and carbon atoms.

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Fim observation of 2.25CrlMo steel

Cited by 14 publications

References 11 publications

Effect of Aging on the Fracture Behavior of Lean Duplex Stainless Steels

Effect of Aging on the Fracture Behavior of Lean Duplex Stainless Steels

Acceleration of Carbon Diffusion by Molybdenum in Low-Temperature Plasma Carburizing of Austenitic Stainless Steel

Grain Boundary Segregation Behavior in 2.25Cr-1Mo Steel During Reversible Temper Embrittlement

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