Effect of sigma phase on the low cycle fatigue property of Z3CN20.09M cast duplex stainless steel in high temperature water

Wu, Huibin; Yang, Bin; Wang, Y.Q.

doi:10.1002/maco.201407721

Cited by 14 publications

(1 citation statement)

References 29 publications

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“…Z3CN20.09M CASS, in which 12~18 vol% is ferrite phase, is widely used for a primary coolant pipe of the pressurized water reactor of nuclear power plants. There have been almost no reports about the effect of sigma phases on moderate-temperature mechanical properties of Z3CN20.09M CASS, although many previous studies have been investigated the corrosion and thermal aging embrittlement behavior, or other mechanical properties, for instance, wearing and low cycle fatigue properties [4,9,20,[23][24][25][26]. Thus, this work studies the effect of sigma phases on the tensile properties of a Z3CN20.09M CASS in the hope of revealing the mechanism behind the effect of sigma phases, providing some guidance on the development of more outstanding stainless steel used for primary coolant pipes, and a comprehensive evaluation of the safe service of nuclear power plants.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sigma Phases on Moderate-Temperature Tensile Properties of Z3CN20.09M CASS Used for Primary Coolant Pipe of Nuclear Power Plant

Wang

et al. 2023

Coatings

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The effect of sigma phases on the moderate-temperature tensile properties of Z3CN20.09M casting austenite stainless steel was investigated by means of isothermal treatment, scanning electron microscopy, transmission electron microscopy, instrumented nanoindentation, tensile testing, and finite element simulation. The results show that the yield strength and ultimate tensile strength of aged specimens tensile tested at moderate temperature increase remarkably with an increasing sigma phase, while the elongation at break decreased. The strain-hardening rate of aged specimens with sigma phases is higher than that of unaged specimens without sigma phases at a certain low-strain range. However, the value of the strain-hardening rate of aged specimens is lower than that of unaged specimens when the strain exceeds a certain value. The effect of the sigma phase on the tensile properties at moderate temperature is also more significant. This can be attributed to the many high-energy σ/γ2 and α/σ/γ2 incoherent phase boundaries caused by the precipitation of sigma phases. On the one hand, these boundaries hinder the movement of dislocations and subsequently accumulate dislocations to some extent, so strength is enhanced and the strain-hardening rate is improved. On the other hand, microcracks at these interfaces initiate and propagate more easily when the strain exceeds a certain value. Thus, the elongation value and the strain-hardening rate decrease.

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Section: Introductionmentioning

confidence: 99%

Effect of Sigma Phases on Moderate-Temperature Tensile Properties of Z3CN20.09M CASS Used for Primary Coolant Pipe of Nuclear Power Plant

Wang

et al. 2023

Coatings

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Effect of machining on the stress corrosion cracking behavior in boiling magnesium chloride solution of austenitic stainless steel

Fang

et al. 2017

Materials & Corrosion

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The stress corrosion cracking (SCC) behaviors of Z3CN20.09M, 304L, and 316L austenitic stainless steels (SSs) after milling operation in boiling magnesium chloride solution were investigated by scanning electron microscopy (SEM), X‐ray diffraction, and 3D profilometer. The experimental results indicated that the roughness and residual stress increased with increasing feed rate of all specimens. The depth of deformation layer after milling operation reached about 150 µm shown as persistent slip bands (PSBs) were formed, leading to hardness enhanced obviously. After SCC tests in boiling magnesium chloride solution, the crack densities increased with increasing feed rate of the Z3CN20.09M SS specimens. However, the crack densities decreased as well as the intergranular (IG) cracking percentages increased with increasing feed rate of the 304L and 316L SS.

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Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

You

Chen

Yang

2018

Materials & Corrosion

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The protectiveness and characterization of the passive film formed on Z3CN20.09M duplex stainless steel aged for different times were investigated by using electrochemical measurements and surface analysis method. The thermal aging causes the spinodal decomposition of the ferrite phase in the steel, resulting in the decrease of localized corrosion resistance. The increased aging time causes a thicker, dispersive, and lower resistance passive film formed on the surface of the steel based on EIS and Mott–Schottky (MS) analysis. The Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS) results indicate that Cr is enriched in the inner layer of the passive films with a reduced content, decreasing the compactness and homogeneity of the passive films.

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Effect of sigma phase on the low cycle fatigue property of Z3CN20.09M cast duplex stainless steel in high temperature water

Cited by 14 publications

References 29 publications

Effect of Sigma Phases on Moderate-Temperature Tensile Properties of Z3CN20.09M CASS Used for Primary Coolant Pipe of Nuclear Power Plant

Effect of Sigma Phases on Moderate-Temperature Tensile Properties of Z3CN20.09M CASS Used for Primary Coolant Pipe of Nuclear Power Plant

Effect of machining on the stress corrosion cracking behavior in boiling magnesium chloride solution of austenitic stainless steel

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

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