Effect of Precipitated Phases on the Pitting Corrosion of Z3CN20.09M Cast Duplex Stainless Steel

Wang, Y. Q.; Yang, Bin; Han, Jingtao; Wu, Huibin; Wang, Xiutong

doi:10.2320/matertrans.m2012410

Cited by 18 publications

(11 citation statements)

References 33 publications

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“…According to the previous studies, a high peak current of the cathodic scan was often attributed to the weak corrosion resistance zone. After annealed at 600 °C, the Cr‐rich phases often precipitated in ferrite, which induced homogeneous distribution of Cr and finally deteriorating corrosion resistance of ferrite . Due to the better stability of austenite, there is no significant change after a short time annealing treatment .…”

Section: Resultsmentioning

confidence: 99%

“…After annealed at 600 °C, the Cr‐rich phases often precipitated in ferrite, which induced homogeneous distribution of Cr and finally deteriorating corrosion resistance of ferrite . Due to the better stability of austenite, there is no significant change after a short time annealing treatment . Consequently, the I r obviously increased for Z3CN20.09M SS after annealed at 600 °C.…”

Section: Resultsmentioning

confidence: 99%

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Effect of residual stress on the stress corrosion cracking in boiling magnesium chloride solution of austenite stainless steel

Wu¹,

Li²,

Fang³

et al. 2018

Materials & Corrosion

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The effect of residual stress on the stress corrosion cracking (SCC) behaviors of Z3CN20.09M, 304L and 316L austenitic stainless steels (SSs) in boiling magnesium chloride solution were investigated by X‐ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The residual stress of surface and the hardness tested on the cross section of specimens induced by milling operation was decreased with increasing annealing temperature. The crack densities were also decreased with increasing annealing temperature of the specimens, and the SCC did not occur after annealed at 600 °C for 3 h except 316L SS when tested in boiling magnesium chloride solution. Crack initiation mechanism related to the damaged effect on grain boundary during milling operation was analyzed. The double loop electrochemical potentiokinetic reactivation (DL‐EPR) tests indicated that the effect of annealing treatment up to 600 °C on intergranular (IG) corrosion susceptibility of 304L and 316L SSs was minor, while it remarkably increased of the Z3CN20.09M SS.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of residual stress on the stress corrosion cracking in boiling magnesium chloride solution of austenite stainless steel

Wu¹,

Li²,

Fang³

et al. 2018

Materials & Corrosion

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“…On the other hand, Cr content of ferrite in specimen B is much higher (about 26%, Fig. 8) and is close to the value of Cr in σ phase 26 . Thermodynamically, this ferrite with more solid solution Cr is also more beneficial for σ phase formation.…”

mentioning

confidence: 87%

Effect of Ferrite on the Precipitation of σ Phase in Cast Austenitic Stainless Steel Used for Primary Coolant Pipes of Nuclear Power Plants

Wang

2017

Mat. Res.

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The effect of ferrite phase on the precipitation of σ phase in a Z3CN20.09M cast austenitic stainless steel (CASS) used for primary coolant pipes of pressurized water reactor (PWR) nuclear power plants was investigated by using isothermal heat-treatment, optical microscopy (OM), transmission electron microscopy (TEM) and electron probe microanalysis (EPMA) techniques. The influence of different morphologies and volume fractions of ferrite in the σ phase formation mechanism was discussed. The amount of σ phase precipitated in all specimens with different microstructures increased with increasing of aging time, however, the precipitation rate is significant different. The formation of σ phase in specimens with the coarsest ferrite and the dispersively smallest ferrite is slowest. The lowest level Cr content in ferrite and fewest α/γ interfaces in specimen are the main reasons for the slowest σ precipitation due to they are unfavorable for the kinetics and thermodynamics of phase transformation respectively. By contraries, the fastest formation of σ phase takes place in specimens with narrow and long ferrite due to the most α/γ interfaces and higher Cr content in ferrite which are beneficial for preferential nucleation and formation thermodynamics of σ phase.

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“…Thermal ageing induces the precipitation of Cr-rich α′ phases in ferrite and brings the Cr-depleted zones around them. The interface between Cr-enriched α′ phase and Crdepleted zone could become the preferential sites for pits initiation, subsequently, pits grew in ferrite 13,28,29 . The more the precipitation of α′ phases and Cr-depleted zones, the worse the pitting resistance of DSS specimens revealing by the lower E p value.…”

Section: Potentiodynamic Anodic Polarisation Curvesmentioning

confidence: 99%

Pitting Corrosion of Thermally Aged Duplex Stainless Steels at Different Temperature for Long Time

Wang

Sun

et al. 2019

Mat. Res.

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The pitting corrosion of three duplex steels (DSS), SAF2205, SAF2507, Z3CN20.09M thermally aged at 350-500 ℃ for 5500 h was investigated by the means of electrochemical techniques. The pitting potential (E p) of thermally aged Z3CN20.09M specimens decreased with increasing of ageing temperature, however, the E p of SAF2205 and SAF2507 thermally aged specimens decreased first and reached the lowest value at 450 ℃ and then increased slightly. The electrochemical impedance spectroscopy results are coincident with the potentiodynamic polarisation testing results. The variation in the charge transfer resistance of specimens coincided with the E p values. There is little influence of low temperature (below 350 ℃) on resistance to pitting of SAF2205 and SAF2507 DSS. But, the pitting resistance of them degrades drastically ageing at higher temperature above 450 ℃. The deterioration in pitting resistance of thermally aged DSS specimens mainly attributes to the precipitation of Cr-rich α′ phases which affected by temperature markedly. At the range of 350-500 ℃, the temperature the higher, the precipitation of Cr-rich α′ phases the more. The formation of G phases and the healing process during the long thermal ageing at 500 ℃ is the other reasons for the change in pitting resistance.

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Effect of Precipitated Phases on the Pitting Corrosion of Z3CN20.09M Cast Duplex Stainless Steel

Cited by 18 publications

References 33 publications

Effect of residual stress on the stress corrosion cracking in boiling magnesium chloride solution of austenite stainless steel

Effect of residual stress on the stress corrosion cracking in boiling magnesium chloride solution of austenite stainless steel

Effect of Ferrite on the Precipitation of σ Phase in Cast Austenitic Stainless Steel Used for Primary Coolant Pipes of Nuclear Power Plants

Pitting Corrosion of Thermally Aged Duplex Stainless Steels at Different Temperature for Long Time

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