Precipitation kinetics and mechanical behavior in a solution treated and aged dual phase stainless steel

Badji, Riad; Kherrouba, Nabil; Mehdi, Brahim; Cheniti, Billel; Bouabdallah, M.; Kahloun, C.; Bacroix, Brigitte

doi:10.1016/j.matchemphys.2014.08.032

Cited by 27 publications

(10 citation statements)

References 40 publications

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“…This research shows that, in agreement with the literature [2,5,10], aging DSS 2304 samples between 650 and 850 • C induces the precipitation of chromium and molybdenum carbides ( Figure 2), and perhaps nitrides (Figure 9). The nucleation of these precipitates occurs essentially at the α/γ interface, acting as a connection between Cr-rich ferrite (which is also relatively rich in Mo) and C-rich austenite [10,47,48].…”

Section: Discussionsupporting

confidence: 91%

“…The significant mechanical and corrosion resistance performances of duplex stainless steels (DSS) are essentially related to their biphasic microstructure, characterized by an austenite/ferrite ratio close to 1 and by their chemical composition, which includes elements like chromium, molybdenum and nitrogen. However, these elements can cause the formation of deleterious secondary phases, such as χ (chi) and σ (sigma) phases and chromium nitrides and/or carbides, if DSS are held, also for brief times, within the 550-950 • C temperature range [1,2]. The σ phase is an intermetallic compound, containing about 30% Cr, 4% Ni and 7% Mo, that nucleates preferentially at the ferrite and ferrite/austenite grain boundaries and then grows into the ferritic grains in DSS aged between 700 and 950 • C [3].…”

Section: Introductionmentioning

confidence: 99%

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Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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In this paper, the effects of thermal aging in the 650–850 °C range on the localized corrosion behaviour of duplex stainless steel (DSS) 2304 was investigated. Pitting corrosion resistance was assessed by pitting potential (Epitt) and critical pitting temperature (CPT) determination, while the degree of sensitisation (DOS) to intergranular corrosion (IGC) was evaluated by double loop electrochemical potentiokinetic reactivation (DL-EPR). The susceptibility to stress corrosion cracking (SCC), evaluated in standard NACE TM-0177 solution at pH 2.7 and 25 °C, with the addition of S2O32− at 10−3 M, resulted in general good agreement with pitting and IGC behaviour. In fact, as-received DSS 2304 aged for 5 min at 650 °C or 750 °C presented a high resistance to localized corrosion. The alloy corrosion behaviour was severely impaired with an aging time of 60 min at 650 °C and of 10 or 60 min at 750 °C, due to the precipitation of finely distributed M23C6-type chromium carbides at ferrite/austenite interphases, which determined the formation of chromium and molybdenum depleted areas. The behaviour of samples aged at 850 °C also depended on the aging time, but, at 60 min, the rediffusion of passivating elements produced a recovery of the alloy resistance to pitting, IGC and SCC.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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“…The latter equation has been verified to be applicable to diffusion controlled reactions in a wide range of works, incl. [70][71][72][73]. If i is taken as 2 then the resulting equation closely approximates Eq (7) which is valid for randomly and homogeneously distributed nuclei, for which growth is not limited by blocking [38,74].…”

Section: Growth and Impingement Of Diffusion Fields In The Modelmentioning

confidence: 58%

Predicting the quench sensitivity of Al–Zn–Mg–Cu alloys: A model for linear cooling and strengthening

et al. 2015

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In this work the quench sensitivity of Al-Zn-Mg-Cu alloys is studied through continuous cooling at constant rates of a range of alloys using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC, TEM and SEM data show that the cooling reactions are dominated by a high temperature reaction (typically ~450 °C down to ~350 °C) due mostly to S-Al2CuMg phase formation, a medium temperature reaction (~350 °C down to ~250 °C) due predominantly to -Mg(Al,Cu,Zn)2 phase formation and a lower temperature reaction (~250 °C down to ~150 °C) due to a Zn-Cu rich thin plate phase. A new, physically-based model is constructed to predict rates of all reactions, enthalpy changes and resulting yield strength in the artificially aged condition. The model incorporates a recently derived model for diffusion-controlled reactions based on the extended volume fraction concept as well as recent findings from first principles modelling of enthalpies of the relevant phases. The model shows a near perfect correspondence with data on all 6 alloys studied extensively by cooling DSC and hardness testing, and 2 allows prediction of the influence of the 3 major elements and 3 dispersoid forming elements on quench sensitivity. Graphical abstract Highlights

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“…304 stainless steel has been widely used in industry and daily life due to its excellent corrosion resistance, mechanical properties, heat resistance, and low‐temperature strength . However, its lower yield strength has led to raw material waste and high costs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rolling Deformation on Nanograins and Mechanical Properties of Exceptional Nano/Microcrystalline 304 Stainless Steel

Wang

Song

et al. 2018

steel research int.

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The nanostructural evolution and mechanical properties during rolling with 30, 50, and 70% deformation of exceptional nano/microcrystalline 304 stainless steel prepared by the aluminothermic reaction casting method are investigated in this paper. The results of the microstructural evolution show that the grain size of the nano/sub‐micrograins have minor changes in which the volume fraction decrease dramatically, but the distribution of the nanograins become uniform with increased rolling deformation. The results of mechanical tests show that the increase in rolling deformation causes great increase in hardness and in yield strength from 274 to 364 HV and from 616 to 743 MPa, respectively. However, the tensile strength increases slightly from 925 to 995 MPa, and elongation decreases slightly from 24.5 to 21.9%. Conclusively, this work proves that an increase in rolling deformation causes a significant improvement in the hardness and strength and no considerable loss of the ductility in nano/microcrystalline 304 stainless steel.

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Precipitation kinetics and mechanical behavior in a solution treated and aged dual phase stainless steel

Cited by 27 publications

References 40 publications

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Predicting the quench sensitivity of Al–Zn–Mg–Cu alloys: A model for linear cooling and strengthening

Effect of Rolling Deformation on Nanograins and Mechanical Properties of Exceptional Nano/Microcrystalline 304 Stainless Steel

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