Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Zhang, Suqiang; Zhao, Hongyun; Shu, Fengyuan; He, Wenxiong; Wang, Guodong

doi:10.3390/met7060194

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Therefore, corrosion products do not form on the surface of samples. Corrosion products play an important role in the study of corrosion behavior [41]. Among the samples, the reference sample has the highest corrosion current density (Table 4).…”

Section: Results Of Corrosion Testmentioning

confidence: 99%

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Azhideh

Aghajani

Pourbagheri

2017

Metals

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Abstract:In this paper the influence of spark energy on corrosion resistance, hardness, surface roughness and morphology of WC-Co coated 36Cr-Ni-Mo4 steel by Micro-Electro Welding (MEW) was investigated. Frequencies of 5, 8 and 11 kHz, currents of 15, 25 and 35 A and duty cycles of 10, 30 and 50 % were applied for coating of the samples using a WC-Co cermet electrode. The results indicate that increasing the current, Duty cycle and frequency of the process increases spark energy. As spark energy increases, efficiency of coating increases to 80% and then decreases. X-ray diffraction (XRD) analysis was used to identify the phases. The results indicated that other than the peaks obtained for the metallic Iron with BCC (Body Centered Cubic) structure, Tungsten Carbide, Cr 7 C 3 and Titanium Carbide phases were also seen on the surface. Vickers micro hardness method was used for hardness measurement of the samples. Surface hardness increases to 817.33 HV0.05 with spark energy increasing up to 1.03 mJ, and then reducing. Optical Microscopy (OM) and scanning electron microscopy (SEM) to study Microstructural and atomic force microscopy (AFM) to study the topography, morphology and roughness were used. Polarization technique in 3.5 wt % NaCl solution was used to evaluate the corrosion properties. The results of the energy dispersive X-ray spectroscopy (EDS) analysis indicate that with increasing spark energy, the amount of Tungsten in surface increases to 41.95 wt % and then decreases. As spark energy increases up to 2.17 mJ, thickness of coating increases to 8.31 µm and then decreases. As spark energy increases, surface roughness is also increased. Corrosion test results indicated that the lowest corrosion rate (2.6 × 10 −8 mpy) is related to the sample with the highest level of efficiency.

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Section: Results Of Corrosion Testmentioning

confidence: 99%

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Azhideh

Aghajani

Pourbagheri

2017

Metals

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“…The porous structure and rod-shaped structure corrosion products have the opposite impact on the resisting mechanism. Furthermore, it has also been observed that porous-structured corrosion product resists corrosion reaction more significantly than rod-shaped corrosion product which is attributed to its high compactness than rod-shaped corrosion product [27]. SEM-EDS elemental-maps of cyclic heat-treated medium carbon low alloy steel are illustrated in figure 8.…”

Section: Immersion Corrosion Propertiesmentioning

confidence: 99%

Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Hafeez

Inam

Farooq

2020

Mater. Res. Express

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Cyclic quenching and tempering (QT) heat-treatment processes have the potential to improve the mechanical properties of steel due to the formation of fine grain size microstructure. This work aims to investigate the mechanical and corrosion properties of experimental medium carbon low alloy steel under cyclic heat-treatment processes. Cyclic single quenching and tempering (SQT), double quenching and tempering (DQT), and triple quenching and tempering (TQT) heat-treatment processes were carried out on the medium carbon low alloy steel. X-ray diffraction analysis validated the formation of fine ε-carbide (Fe 2.4 C) after intermediate low-temperature tempering in DQT and TQT heat-treatments. These fine carbides provided preferential nucleation sites for the formation of new austenitic grain, resulting in a refined microstructure composed of supersaturated (carbon) lath martensite (α′) and retained austenite (γ). The DQT and TQT heat-treatments improved 19% tensile strength, 100% elongation, and 95% impact absorption energy in comparison to SQT heat-treatment. DQT and TQT heat-treatments also transformed the brittle behavior of SQT steel into a ductile behavior. It was also revealed by the small number and size of dimples along with a large number of short tear ridges in fractographs. Morphology of corrosion products of heattreated experimental steel was also studied in a 5% NaCl solution. The SQT heat-treated sample showed porous morphology of corrosion products, while the TQT sample showed morphology with less porosity on the surface. The DQT sample showed solid corrosion morphology with little porosity. As the grain size went on decreasing in the cyclic heat-treatments the corrosion rate was also dropped.

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“…%. It has a homogenous ferritepearlite steel constituent [23,24] which gives a microstructure of some pearlite with a few proeutectoid ferrite phases lying along the prior austenite grain boundary. In this microstructure, ferrite is a carbon-poor phase which is in a body-centered cubic form of iron with a maximum carbon solubility of 0.02 wt.…”

Section: Characterisation For the Carburization Effect Of Metallized mentioning

confidence: 99%

Sustainable Steel Carburization by Using Snack Packaging Plastic Waste as Carbon Resources

Yin

Rajarao

Pahlevani

et al. 2018

Metals

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Abstract:In recent years, the research regarding waste conversion to resources technology has attracted growing attention with the continued increase of waste accumulation issues and rapid depletion of natural resources. However, the study, with respect to utilizing plastics waste as carbon resources in the metals industry, is still limited. In this work, an environmentally friendly approach to utilize snack packaging plastic waste as a valuable carbon resources for steel carburization is investigated. At high temperature, plastic waste could be subject to pyrolytic gasification and decompose into small molecular hydrocarbon gaseous products which have the potential to be used as carburization agents for steel. When heating some snack packaging plastic waste and a steel sample together at the carburization temperature, a considerable amount of carbon-rich reducing gases, like methane, could be liberated from the plastic waste and absorbed by the steel sample as a carbon precursor for carburization. The resulting carburization effect on steel was investigated by optical microscopy, scanning electron microscopy, electron probe microanalyzer, and X-ray photoelectron spectrometer techniques. These investigation results all showed that snack packaging plastic waste could work effectively as a valuable carbon resource for steel carburization leading to a significant increase of surface carbon content and the corresponding microstructure evolution in steel.

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Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

Cited by 7 publications

References 38 publications

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Surface Characterization and Corrosion Resistance of 36Cr-Ni-Mo4 Steel Coated by WC-Co Cermet Electrode Using Micro-Electro Welding

Mechanical and corrosion properties of medium carbon low alloy steel after cyclic quenching and tempering heat–treatments

Sustainable Steel Carburization by Using Snack Packaging Plastic Waste as Carbon Resources

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