Influence of localized plasticity on oxidation behaviour of austenitic stainless steels under primary water reactor

Cissé, Sarata; Laffont, Lydia; Lafont, Marie‐Christine; Tanguy, B.; Andrieu, Éric

doi:10.1016/j.jnucmat.2012.09.020

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…Considering the sputtering rate in this work is about 0.1 nm/s with reference to Ta 2 O 5 layer, the thicknesses of the oxide films grown on ground and electropolished 316LN stainless steel are estimated to be 35.7 and 24.9 nm, respectively, suggesting a thinner oxide film grown on electropolished sample. Many investigations have confirmed chromium (Cr) is the key element to form a compact and protective oxide film, which exists in the formation of chromic oxide (Cr 2 O 3 ) or chromites ((Fe, Ni)Cr 2 O 4 ). It is clearly indicated by Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of surface states on the oxidation behavior of 316LN stainless steel in high temperature pressurized water

Guo

Han

Wang

2014

Materials & Corrosion

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Nuclear grade 316LN stainless steel with different surface states are prepared: electropolished and ground to 240 grit. Surface topography, surface Volta potential distribution, and nanohardness distribution on cross‐sectional surface are investigated, respectively. Oxide films on the ground and electropolished samples after immersion in high temperature pressurized (HTP) water for 0.1, 168, and 366 h were studied using various methods. Distinct from electropolished surface, the ground surface is featured by a rugged surface and a heterogeneous distribution of surface Volta potential. A thicker (∼28 µm) cold‐worked layer was introduced by grinding. More crystallites were precipitated on the ground surface, resulting from the existence of high‐energy sites with higher residual strain and higher electrochemical activity and a less protective inner layer. The oxidation rate was reduced by electropolishing and a thinner oxide film was formed, due to the formation of a more protective oxide film with higher content of chromium (Cr). The mechanism of oxide film formation was further discussed.

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Section: Resultsmentioning

confidence: 99%

Effects of surface states on the oxidation behavior of 316LN stainless steel in high temperature pressurized water

Guo

Han

Wang

2014

Materials & Corrosion

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“…This phase, which is nodule-shaped, is often observed at grain boundaries and within grains. [23,24] Cellular precipitates growing from grain boundaries are also detected by TEM. Based on the SADP, the spots of precipitates corresponded to the η-phase [Ni 3 Ti:hcp, D024 type].…”

Section: Microstructure After Aging At 720 C For 16 Hmentioning

confidence: 99%

Effect of Carbon and Titanium Variations in Fe‐Based Heat‐Resistant Superalloy A286 on TiC and η Phase Formation

Qurashi

Zhao

Chen

et al. 2022

steel research int.

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A286 super austenitic stainless steel is a kind of superalloy containing large amounts of Ni and Cr and small amounts of Ti (1-3%), C (0-0.06%), Al (0.1-0.3%), Mn (0.5-1.5%), and Co (0-0.5). [1] Similar to Ni-based superalloys in microstructure, this alloy is strengthened by age-hardening. As a heat-resistant superalloy, it has been designed for applications requiring sufficiently high creep fracture strength and excellent fatigue resistance at temperatures as high as 700 C. Typical areas of applications include aircraft engines, turbine wheels and blades, fasteners and springs, etc. [2][3][4][5][6] In this alloy, eta (η) Ni 3 Ti hcp phase is a stable phase which is formed from the dissolution of γ 0 phase [7][8][9] at aging temperatures in the range of 600 850 C. [10][11][12][13] Some researchers stated that during prolonged hotworking above 720 C, η phase can easily precipitate at grain boundaries from the fcc austenitic matrix, [14] which can have a direct influence on the creep behavior of the alloys. [15,16] Depending on the chemical composition and heat treatment conditions, η and carbide phases precipitate simultaneously or sequentially in this alloy system.Many efforts have been made by researchers to find a suitable composition which can enhance the strengthening mechanism by proper control of eta (η) phases up to some extent at high temperature by the addition of alloying elements. Finding a suitable ratio of constituent elements, especially Ti and Al, is required to give the highest strengthening effect at higher temperature works for a long time. [8][9][10][11][12][13][15][16][17][18] Moreover, it is well known that the addition of C is required in some alloys to enhance hardness, [19] but elemental C can cause brittleness during composition setting. If C and Ti are added in a certain ratio, they can combine with each other to form into TiC, which acts as a reinforcement ceramic particles and has a beneficial effect by enhancing the strengthening mechanism in alloys. [16,17] Strengthening mechanism by TiC reinforcement particles has been widely studied in different stainless steel alloys, especially 300 and 400 series, [20,21] but not well studied in A286 heatresistant alloys.To enhance the strengthening mechanism at sufficient high temperatures, TiC particles are widely used in the austenite matrix as a reinforcement, [16,17] which can limit the formation of chromium-rich M 23 C 6 -type carbide at grain boundaries, can prevent intergranular stress corrosion, and can increase the tensile and creep strength at both high and low temperatures.

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“…2). This solution treatment allows to: (i) reduce or even remove the effects of the mechanical history of the material [25]; and (ii) remove any possible chemical segregation associated with the formation of g' and h phases because, as pointed out by Ratna and Sarma [26], the solvus temperature of g' phase in A286 superalloy is 855°C and, as demonstrated by Seifollahi et al [7], the h phase is completely dissolved at 900°C and the microstructure of A286 superalloy is free of h. According to Table 2, there were seven different tensile shear test specimens.…”

Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy

Martín

Tiedra

Blanco

2019

Metall. Res. Technol.

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This work aims to study the effect of Widmanstätten h phase on tensile shear strength (TSS) of resistance spot welding joints (RSW) of A286 superalloy subjected to post-weld high temperature aging treatment. The tensile shear test specimens were welded in the solution treated condition, and then subjected to six different post-weld aging treatments (at an aging temperature of 840°C for six different aging times). The ascast dendritic microstructure of the weld nugget and the austenite equiaxed-grain microstructure of the base metal have a different response to the post-weld high temperature aging treatment. Growth of Widmanstätten h phase in the weld nugget is faster than in the base metal. While in the base metal the Widmanstätten h phase precipitates into the grain, in the weld nugget precipitates at the interdendritic region because of the segregation of Ti towards the last-to-solidify interdendritic regions (studied by performing SEM/EDX analysis). Although the hardness increases with the presence of Widmanstätten h phase, the increase in hardness does not necessarily imply an increase in the experimental TSS.

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Influence of localized plasticity on oxidation behaviour of austenitic stainless steels under primary water reactor

Cited by 9 publications

References 23 publications

Effects of surface states on the oxidation behavior of 316LN stainless steel in high temperature pressurized water

Effects of surface states on the oxidation behavior of 316LN stainless steel in high temperature pressurized water

Effect of Carbon and Titanium Variations in Fe‐Based Heat‐Resistant Superalloy A286 on TiC and η Phase Formation

Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy

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