Improved corrosion resistance of Ni-base Alloy 600 welded joint by laser shock peening

Wan, Zhandong; Dai, Wei; Guo, Wei; Jia, Qiang; Zhang, Hongqiang; Xue, Jia; Lin, Luchan; Peng, Peng

doi:10.1016/j.jmapro.2022.05.061

Cited by 25 publications

(7 citation statements)

References 21 publications

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“…Figure 2 displays the CRS in Ni-based superalloy specimens treated with different impact densities. The as-cast sample exhibited low residual stress close to 0 MPa, consistent with prior research (Wan et al , 2022). At impact densities of 1.96 s/mm 2 , 1.71 s/mm 2 and 0.98 s/mm 2 , the measured CRS on the specimen surfaces was −585.8 MPa, −440.9 MPa and −215.6 MPa, respectively.…”

Section: Resultssupporting

confidence: 89%

Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact

Jiang,

Guan,

Zhao

et al. 2023

ACMM

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Purpose The purpose of this study is to investigate the corrosion resistance of superalloys subjected to ultrasonic impact treatment (UIT). The passive film growth on the superalloys’ surface is analyzed to illustrate the corrosion mechanism. Design/methodology/approach Electrochemical tests were used to investigated the corrosion resistance of GH4738 superalloys with different UIT densities. The microstructure was compared before and after the corrosion tests. The passive film characterization was described by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS) tests. Findings The compressive residual stress and corrosion resistance of the specimens significantly increased after UIT. The order of corrosion resistance is related to the UIT densities, i.e. 1.96 s/mm2 > 1.71 s/mm2 > 0.98 s/mm2 > as-cast. The predominant constituents of the passive films are TiO2, Cr2O3, MoO3 and NiO. The passive film on the specimen with 1.96 s/mm2 UIT density has the highest volume fraction of Cr2O3 and MoO3, which is the main reason for its superior corrosion resistance. Originality/value This study provides quantitative corrosion data for GH4738 superalloys treated by ultrasonic impact. The corrosion mechanism is explained by the passive film’s characterization.

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Section: Resultssupporting

confidence: 89%

Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact

Jiang,

Guan,

Zhao

et al. 2023

ACMM

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“…Likewise, Cao et al [48] obtained an integrity mixed oxide lm on LSP-treated nickel-base alloy after hot corrosion, and they found that the initiation of cracks and pores on the aluminized layer was inhibited and the adhesion between the corrosion layer and matrix was improved due to the surface CRS. Although the oxidation rate of LSP-treated steel was slightly higher than that of aluminized steel in periods (I), the high melting point and chemical stability of NiAl phase on nickel-rich layer of aluminized layer could hinder the further inward diffusion of O element [49]. Compared with aluminized steel, the oxide lm of LSP steel remains compactness and integrality in periods (II), and no evident internal oxidation zone was formed on aluminized layer.…”

Section: The Oxidation Mechanism Of Specimensmentioning

confidence: 95%

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Qin

Jiang

et al. 2023

Preprint

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The high-temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger highly determines its service life. Therefore, in this work, aluminizing treatment and aluminizing with subsequent laser shock peening (LSP) were employed to improve the high-temperature oxidation resistance of AISI 321 stainless steel at 620°C. The results showed that these two treatments decreased the oxidation rate as compared to the base AISI 321 steel. Concretely, the optimal oxidation resistance was observed in the aluminized steel before an oxidation testing time of 144 h due to the increased the entropy of the LSP-treated specimen. After 144 h, however, the LSP-treated sample showed the best oxidation resistance because of the formation of protective α-Al2O3. For the LSP-treated samples, the large amount of sub-grain boundaries formed on aluminized layer could act as the fast short-circuit path for the outward diffusion of Al element, facilitating the rapid nucleation of α- Al2O3. Meanwhile, the aluminized layer is able to isolate the contact between oxidation environment and matrix, thereby decreasing the oxidation rate. Further, the oxidation parabolic constant D(t) of LSP-treated steel was calculated to be minimum (6.45787×10–14), which is respectively 69.18% and 36.36% of aluminized steel and 321 steel during the whole oxidation process. Consequently, the combination of aluminizing and LSP can better improve the high-temperature oxidation resistance of 321 stainless steel.

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“…Nickel alloys contain a significant amount of nickel, which provides excellent corrosion resistance in a wide range of harsh and corrosive environments. However, specific grades of nickel alloys such as alloy 600 can still experience PTA corrosion [41]. Factors like temperature, pressure, alloy composition, and the chemical environment play significant roles.…”

Section: Pta Corrosion In Refineymentioning

confidence: 99%

“…These acids act as cathodic depolarizers, facilitating metal dissolution at chromium-depleted grain boundaries through cathodic reduction [9]. For example, it has been reported that sensitized alloy 600 is vulnerable to rapid SCC even at ambient temperatures when exposed to sulfur-bearing environments such as PTA [41]. The proneness to PTASCC in these materials is primarily due to sensitization, which leads to the precipitation of detrimental phases along grain boundaries.…”

Section: Materials Selectionmentioning

confidence: 99%

Corrosion by Polythionic Acid in the Oil and Gas Sector: A Brief Overview

Vakili,

Koutník,

Kohout

2023

Materials

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Polythionic acid (PTA) corrosion is a significant challenge in the refinery industry, leading to equipment degradation, safety risks, and costly maintenance. This paper comprehensively investigates the origin, progression, mechanism, and impact of PTA corrosion on various components within refinery operations. Special attention is afforded to the susceptibility of austenitic stainless steels and nickel-based alloys to PTA corrosion and the key factors influencing its occurrence. Practical strategies and methods for mitigating and preventing PTA corrosion are also explored. This paper underscores the importance of understanding PTA corrosion and implementing proactive measures to safeguard the integrity and efficiency of refinery infrastructure.

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Improved corrosion resistance of Ni-base Alloy 600 welded joint by laser shock peening

Cited by 25 publications

References 21 publications

Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact

Research on the corrosion resistance and the passive film growth of Ni-based superalloy surface treated by ultrasonic impact

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Corrosion by Polythionic Acid in the Oil and Gas Sector: A Brief Overview

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