In situ phase transformation of Laves phase from Chi-phase in Mo-containing Fe–Cr–Ni alloys

Tan, Lizhen; Yang, Ying

doi:10.1016/j.matlet.2015.06.018

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…The aging at 900°C (Figure 7b) caused greater ε phase presence (higher diffraction peak at 2θ = 64°) compared to steel aged at 650°C 13,14 . Also, in Figure 7b, the intermetallic phases called Laves were observed at 2θ = 38º in the 0.4% Mo austenitic stainless steel aged at 900ºC [15][16][17] . The presence of Laves phases (with molybdenum) and the greater presence of ε phase (rich in carbon) in 0.4% Mo austenitic stainless steel aged at 900ºC can be considered the possible cause of the increase (approximately 30%) in its degree of sensitization in relation to steel aged at 650°C (Table 2).…”

Section: Resultsmentioning

confidence: 99%

Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

et al. 2021

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This study aims at assessing the degree of susceptibility to intergranular corrosion of the UNS S31803 duplex stainless steel and the 0.4% Mo austenitic stainless steel through the double-loop electrochemical potentiodynamic reactivation (DL-EPR) test. Both steels were subjected to isothermal treatments at 650ºC and 900ºC in order to compare the effect of temperature on the respective degrees of sensitization. It was observed that the 0.4% Mo austenitic stainless steel presented a higher degree of sensitization and, consequently, a greater susceptibility to the intergranular corrosion process when compared to the UNS S31803 duplex stainless steel in the two temperatures studied. It was also observed that, for both steels, the heat treatment at 900ºC resulted in a higher degree of sensitization when compared to the heat treatment at 650ºC.

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Section: Resultsmentioning

confidence: 99%

Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

et al. 2021

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“…To capture the thermodynamics of 316 SS we use the OCTANT database [14,41,42]. OCTANT includes Fe, C, Cr, Ni, Mn, Mo, and Si with a focus on thermodynamic modeling of AISI 316 austenitic stainless steels.…”

Section: Thermodynamicsmentioning

confidence: 99%

Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation

et al. 2017

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The current work combines the Cluster Dynamics (CD) technique and CALPHAD-based precipitation modeling to address the second phase precipitation in cold-worked (CW) 316 stainless steels (SS) under irradiation at 300-400 °C. CD provides the radiation enhanced diffusion and dislocation evolution as inputs for the precipitation model. The CALPHAD-based precipitation model treats the nucleation, growth and coarsening of precipitation processes based on classical nucleation theory and evolution equations, and simulates the composition, size and size distribution of precipitate phases. We benchmark the model against available experimental data at fast reactor conditions (9.4 × 10 -7 dpa/s and 390 °C) and then use the model to predict the phase instability of CW 316 SS under light water reactor (LWR) extended life conditions (7 × 10 -8 dpa/s and 275 °C). The model accurately predicts the γꞌ (Ni 3 Si) precipitation evolution under fast reactor conditions and that the formation of this phase is dominated by radiation enhanced segregation. The model also predicts a carbide volume fraction that agrees well with available experimental data from a PWR reactor but is much higher than the volume fraction observed in fast reactors. We propose that radiation enhanced dissolution and/or carbon depletion at sinks that occurs at high flux could be the main sources of this inconsistency. The integrated model predicts ~1.2% volume fraction for carbide and ~3.0% volume fraction for γꞌ for typical CW 316 SS (with 0.054 wt.% carbon) under LWR extended life conditions. This work provides valuable insights into the magnitudes and mechanisms of precipitation in irradiated CW 316 SS for nuclear applications.

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“…The Laves phase is primarily in the form Fe 2 Mo with a hexagonal structure (P6 3 /mmc space group) and lattice parameters of a = 0.473 nm and c = 0.772 nm. 5 Figure 2c displays the SEM image of the line-shaped phases along the entire grain boundaries in the steel when aged at 800°C for 24 h. The corresponding EDS analysis (Table 2) shows that the precipitates are composed of Fe, Cr, Ni, Si and Mo. Although these phases are not detected by XRD measurements in spite of their small sizes and low volume (Fig.…”

Section: Characterisation Of Precipitationmentioning

confidence: 99%

“…Good corrosion resistance is mainly achieved by addition of a large amount of element Cr and Mo, addition of stabilising elements such as Ti and Nb, and deep decarbonising and denitriding. However, a high Cr and Mo content will promote the precipitation of several intermetallic phases such as the Laves phase, 1,2 chi (χ) phase [3][4][5][6] and Sigma (σ) phase, [7][8][9] which are supposed to be detrimental to the ductility, toughness, fatigue, and corrosion resistance of the final products. [10][11][12] So far, several studies have been performed on precipitations in duplex and super austenitic stainless steels (ASS).…”

Section: Introductionmentioning

confidence: 99%

Characterisation of precipitates formed in 26% Cr super ferritic stainless steel

Shen

2016

Ironmaking & Steelmaking

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In this study, a newly designed super ferritic stainless steel, 26Cr-4Mo-2Ni, was developed and heated to 800°C for different durations to study the precipitation behaviour of various intermetallic phases, which determined its final mechanical and corrosion resistance properties. The types, numbers and distribution of typical precipitates were investigated. Besides TiN and Nb(C,N), which are common phases formed in Ti-and Nb-stabilised ferritic stainless steel, the Laves, chi (χ) and sigma (σ) phases were also detected in the grain boundary and grain interiors, depending on the aging times . The study focused on the morphology and regularity of these intermetallic precipitates. And the effect of precipitation on the mechanical properties and the corrosion resistance were discussed.

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In situ phase transformation of Laves phase from Chi-phase in Mo-containing Fe–Cr–Ni alloys

Cited by 19 publications

References 9 publications

Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

Comparative Study Between Sensitization Degree of the 0.4% Mo Austenitic Stainless Steel and UNS S31803 Duplex Stainless Steel

Integrated modeling of second phase precipitation in cold-worked 316 stainless steels under irradiation

Characterisation of precipitates formed in 26% Cr super ferritic stainless steel

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