Effects of ageing conditions on the precipitates evolution, chromium depletion and intergranular corrosion susceptibility of AISI 316L: experimental and modeling results

Sahlaoui, Habib; Makhlouf, Kamel; Sidhom, Habib; Philibert, J.

doi:10.1016/j.msea.2003.12.017

Cited by 154 publications

(82 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All these results indicate that the small quenched-in Cr 2 N finely dispersed in the ferrite phase do not cause localized corrosion of the 2205 DSS in 1 M NaCl solution. It has been reported for different alloys such as austenitic alloys [24][25][26] and CoCrMo alloys [27] that the precipitation of secondary phases, e.g. nitrides or carbides, leads to weaker corrosion resistant areas in their surrounding regions, due to local Cr and N depletion.…”

Section: Influence Of Quenched-in Chromium Nitrides On the Corrosion mentioning

confidence: 99%

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Bettini

Kivisäkk

Leygraf

et al. 2013

Electrochimica Acta

View full text Add to dashboard Cite

PostprintThis is the accepted version of a paper published in Electrochimica Acta. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Bettini, E., Kivisäkk, U., Leygraf, C., Pan, J. [Year unknown!] Study of corrosion behavior of a 22% Cr duplex stainless steel: influence of nano-sized chromium nitrides and exposure temperature. Electrochimica ActaAccess to the published version may require subscription. AbstractChromium nitrides may precipitate in duplex stainless steels during processing and their influence on the corrosion behavior is of great importance for the steel performance. In this study, the influence of nanosized quenched-in chromium nitrides on the corrosion behavior of a heat treated 2205 duplex stainless steel was investigated at room temperature and 50 °C (just above critical pitting temperature). The microstructure was characterized by SEM/EDS and AFM analyses, and quenched-in nitrides precipitated in the ferrite phase were identified by TEM analysis. Volta potential mapping at room temperature suggests lower relative nobility of the ferrite matrix. Electrochemical polarization and in-situ AFM measurements in 1 M NaCl solution at room temperature show a passive behavior of the steel despite the presence of the quenched-in nitrides in the ferrite phase, and preferential dissolution of ferrite phase occurred only at transpassive conditions. At 50 °C, selective dissolution of the austenite phase was observed, while the ferrite phase with the quenched-in nitrides remained to be stable. It can be concluded that the finely dispersed quenched-in nitrides do not cause localized corrosion, whereas the exposure temperature has a strong influence on the corrosion behavior of the duplex stainless steel.

show abstract

Section: Influence Of Quenched-in Chromium Nitrides On the Corrosion mentioning

confidence: 99%

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Bettini

Kivisäkk

Leygraf

et al. 2013

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…As the σ-phase grows, islands of secondary austenite develop inside it owing to the formation of chromium-depletion zones ( Fig. 1) (Matula et al, 2001;Sahlaoui et al, 2004). The chemical composition of the secondary phases is shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…During this annealing, first the formation of chromium-rich carbides (type M 23 C 6 ) starts and consequently the σ-phase appears (Marshall, 1984;Wasnik et al, 2003;Sahlaoui et al, 2004). The Laves phase nucleates inside the austenitic grain (Marshall, 1984;Matula et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Only a few papers refer to the influence of these tests on the σ-phase (Cíhal, 1978;Sahlaoui et al, 2004). According to Cíhal (1978), both tests (OAE and EPR) could react to the presence of chromium-rich carbides and the σ-phase, whereas one paper (Sahlaoui et al, 2004) introduces only the possibility of chromium depletion in the zones adjacent to M 23 C 6 carbides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural analysis and intergranular corrosion tests of AISI 316L steel

Stonawska

Svoboda

Sozańska

et al. 2006

Journal of Microscopy

View full text Add to dashboard Cite

SummaryPure AISI 316L steel is investigated after solution heat treatment (1050 °C/H 2 O) and structural sensitization (650 °C). Two quite different intergranular corrosion tests are used to determine the degree of structural sensitization due to the precipitation of secondary phases along the grain boundaries (mainly the M 23 C 6 and σ-phase): the oxalic acid etch test and the electrochemical potentio-kinetic reactivation test. Generally, the dissolution of chromium-rich carbides (M 23 C 6 ) is provoked by oxalic acid etch tests, whereas the chromiumdepleted zones, in the vicinity of chromium-rich carbides (M 23 C 6 ), are attacked by electrochemical potentio-kinetic reactivation tests. Both intergranular corrosion tests are used to determine the maximum degree of structural sensitization. Thus structural analysis by carbon replicas reveals the Laves phase, and both the M 23 C 6 and (Cr,Mo) x (Fe,Ni) y phases. The results of intergranular corrosion tests are related to the findings of the structural analysis.

show abstract

“…Therefore, considerable attention has been paid to the precipitation of secondary phases in the corrosion resistant steels with ferrite/austenite duplex microstructure in the conditions of high-temperature isothermal aging [61][62][63][64][65][66][67][68][69][70][71][72]. Less information is available concerning the formation of secondary phases during the welding and continuous cooling after high-temperature treatment [73][74][75][76][77][78][79].…”

Section: Introductionmentioning

confidence: 99%

Microscopic analysis of the stainless steel weld metal after long-term thermal exposition in the primary circuit of the nuclear power plant

Grgac¹,

Čaplovič²,

Dománková³

et al. 2021

View full text Add to dashboard Cite

In the paper, results of microscopic analyses of the weld metal taken from weld joint of the thick-walled austenitic stainless steel pipeline of the primary circuit of the nuclear power plant WWER-440 are presented. The weld joint has been exposed in the main circulation pipeline approximately 180,000 h at temperatures approaching 300• C. A sample taken from a top part of the multi-pass weld joint has been analyzed by scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy and high-resolution transmission electron microscopy. The analyzed weld metal exhibited a duplex microstructure consisting of the austenite phase and a semi-continual network of δ-ferrite phase. The mean hardness of the weld metal was 195 HV1. In the weld metal, globular non-metallic inclusions, as well as carbonitride particles of the MX type and chromium based carbide particles of M23C6 type, were identified. At the phase interfaces of δ-ferrite/austenite, the presence of particles of σ-phase placed in the volumes of δ-ferrite network was detected. The presence of σ-phase and M23C6 carbide particles in the top part of the weld can be explained as a consequence of the short-term expositions of the weld metal in the temperature range from about 900 to 600• C during the multi-pass welding process of the primary circuit of the nuclear power plant. High--resolution transmission electron microscopy analysis of the ferrite phase regions revealed in thin foils the presence of mottled contrast indicating the spinodal decomposition of the δ-ferrite to Cr-rich α -and Fe-rich α-phases. It is supposed that the decomposition of the δ-ferrite phase started during final stages of the multi-pass welding process at thermal expositions around 475• C and continued during long-term exposition at the operation temperatures of the primary circuit.K e y w o r d s : stainless steel, weld metal, low-temperature thermal aging, σ-phase, carbide phase, α -phase

show abstract

Effects of ageing conditions on the precipitates evolution, chromium depletion and intergranular corrosion susceptibility of AISI 316L: experimental and modeling results

Cited by 154 publications

References 24 publications

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Structural analysis and intergranular corrosion tests of AISI 316L steel

Microscopic analysis of the stainless steel weld metal after long-term thermal exposition in the primary circuit of the nuclear power plant

Contact Info

Product

Resources

About