The effect of cold rolling on grain boundary structure and stress corrosion cracking susceptibility of twins in alloy 690 in simulated PWR primary water environment

Kuang, Wenjun; Was, Gary S.; Miller, Cody; Kaufman, Michael L.; Alam, Talukder; Gwalani, Bharat; Banerjee, Rajarshi

doi:10.1016/j.corsci.2017.11.002

Cited by 45 publications

(8 citation statements)

References 48 publications

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“…The peaks in the misorientation angle distribution plots in Figure 15 correspond to the 60 • /<111> (Σ3) misorientation, as it has been clearly demonstrated in the misorientation axis distribution, which is a characteristic of coherent twin boundaries [30]. This also coincides with the orientation difference relationship of Σ3 [31][32][33][34]. The number of twins in the special grain boundary Σ3 is drastically reduced, mainly due to the tendency of the grain boundary in the crystal when deformation is applied: high-angle grain boundary (Σ3 twin) → ordinary high-angle grain boundary → low-angle grain boundary [35].…”

Section: Effect Of Pre-stretching On Residual Stresssupporting

confidence: 63%

Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy

Zhu

Yuan

2021

Metals

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The residual stress generated in a superalloy during heat treatment affects the subsequent processing of the workpiece and may even adversely affect its performance. This paper investigates the effects of pre-stretching (in the range from 0% to 9%) before aging treatment on residual stress generated during quenching process and microstructure of Inconel 718 superalloy. After pre-stretching treatment, the residual stress deriving from quenching process can be well reduced. When the pre-stretch level was 3%, the quenching residual stress reached a maximum reduction of 72%, and the strength increased by 7.1%, while the product of strength and elongation hardly changed. Simultaneously, the microstructures of the pre-stretched specimens are observed by electron back scatter diffraction (EBSD) and transmission electron microscopy (TEM). It was found that the fraction of high-angle grain boundaries in the alloy decreased while that of low-angle grain boundaries increased with increasing pre-stretch level. As the pre-stretch level was further increased to 9%, the proliferating entanglement of internal dislocations in the specimen was intensified, resulting in rod-shaped γ″ precipitates coarsening and volume fraction reduction of precipitates, which further led to a reduction in the product of strength and elongation of material.

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Section: Effect Of Pre-stretching On Residual Stresssupporting

confidence: 63%

Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy

Zhu

Yuan

2021

Metals

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“…Lots of experiments have investigated the corrosion behavior of alloy 690 under different service environments [13][14][15][16]. For instance, Duan et al analyzed the influences of temperature, pH and dissolved oxygen concentration on the corrosion behavior of alloy 690 [17].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of nanocrystallines alloy 690 at high-temperature and high-pressure in simulated PWR secondary environment

Li¹,

Liu²,

Liu³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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The influence of ultrasonic surface rolling treatment (USRT) on the corrosion behaviour of nanocrystallines (NC) alloy 690 at high temperature and high pressure in simulated PWR secondary environment was performed by using Raman spectrometer, X-ray photoelectron spectrometer (XPS) and scanning electron microscopy (SEM). After USRT, the average size and the thickness of NC surface layer could reach 55 nm and 1 μm, respectively. Electrochemical measurements showed that the oxide film on the surface of NC alloy 690 was denser and more complete compared with coarse grained (CG) samples. The corrosion tests in ethanolamine (ETA) solution illustrated that the fine oxide particles were evenly distributed on the oxide film of NC alloy 690. The corrosion potential increased from −364 mV to −229 mV, while the corrosion current density dropped from 18.07 × 10−8 mm2 A cm−2 to 8.842 × 10−8 mm2 A cm−2 after USRT. By analysis, the inner layer of oxide film consisted of Cr2O3, NiFe2O4, and FeCr2O4, while Ni hydroxides formed the major part of the outermost layer of film. A growth model of oxide films on alloy 690 at high-temperature and high-pressure in stimulated PWR secondary environments was proposed and discussed.

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“…Investigation of other materials indicated that the hot or cold rolling processing parameters could improve or deteriorate the corrosion or SCC resistance by changing the grain size, crystallographic texture and grain boundary characteristics, etc. [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High-Strength Low-Alloy Steel via Finish Rolling within Non-recrystallization Temperature

Zhao

Yang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The effect of hot rolling process on microstructure evolution, mechanical properties and stress corrosion cracking (SCC) resistance of high-strength low-alloy (HSLA) steels was investigated by varying the finish rolling temperature (FRT) and total rolling reduction. The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of 60% with the FRT of 950 °C (within recrystallization temperature T r ). The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance. A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite-austenite (M/A) constituents and resultant low ductility and SCC resistance. In contrast, a good combination of strength, ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860 °C (within non-recrystallization temperature T nr ), probably because of the fine grain size and M/A constituents, as well as a high density of grain boundary network.

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The effect of cold rolling on grain boundary structure and stress corrosion cracking susceptibility of twins in alloy 690 in simulated PWR primary water environment

Cited by 45 publications

References 48 publications

Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy

Effect of Pre-Stretching on Residual Stresses and Microstructures of Inconel 718 Superalloy

Corrosion behaviour of nanocrystallines alloy 690 at high-temperature and high-pressure in simulated PWR secondary environment

Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High-Strength Low-Alloy Steel via Finish Rolling within Non-recrystallization Temperature

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