Performance Evaluation of the Effects of Post Weld Heat Treatment on
the Microstructure, Mechanical and Corrosion Potentials of Low
Carbon Steel

Oladele, Isiaka Oluwole; Alonge, Davies Babatunde; Betiku, Timothy; Igbafen, E. O.; Adewuyi, B. O.

doi:10.24867/atm-2019-1-007

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…The PWHT ensures dimensional stability and reduces residual stress along the heat-affected zone of weldment, which improves welded joints' performance. This is similar to the residual stress relief performed through the post-heat treatment of quenched steel [18].…”

Section: Introductionsupporting

confidence: 74%

Post-heat treatment of electrochemically carburized low-carbon steel

Sow¹,

Karen²,

Bahrin³

et al. 2023

J. Electrochem. Sci. Eng.

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Limited studies are available on post-heat treatment (tempering/annealing) of electrochemically carburized low-carbon steel, which can relieve internal stresses induced by the quenching process. In this study, the electrochemical carburization was carried out using the electrolyte mixture of sodium carbonate (Na2CO3) and sodium chloride (NaCl) under a CO2 gas environment and 800 °C. The samples were then quenched in either water or oil. The peak hardness of the water-quenched sample (WQ) was higher than the oil-quenched sample (OQ). Comparatively, post-heat treated (tempered and annealed) samples showed lower peak hardness compared to quenched samples. An optical microscope was used to observe microstructural changes, while X-ray diffraction (XRD) was used to examine metal phases within all samples. The full width at half maximum (FWHM) of the martensite peak supported the stress relief in both tempered and annealed samples. Scanning electron microscope (SEM) with energy dispersive X-ray (EDX) was applied to determine the elemental composition of as received and electrochemically carburized and quenched low-carbon steel samples. The carbon content of the WQ sample was relatively higher than the OQ sample, whereas the tempered samples showed higher carbon content compared to the annealed samples, but both were lower than for quenched samples. Electrochemical carburization increased the carbon content and improved the hardness, while the tempering or annealing process relieved internal stresses that resulted in the hardness reduction.

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Section: Introductionsupporting

confidence: 74%

Post-heat treatment of electrochemically carburized low-carbon steel

Sow¹,

Karen²,

Bahrin³

et al. 2023

J. Electrochem. Sci. Eng.

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“…The plot depicts a single depressed capacitive semicircle between the frequency range. The plots for the as-welded and post-weld tempered samples are similar, indicating similar corrosion mechanisms [27]. However, the smaller size of the semicircle for as-welded in seawater suggests lower charge transfer resistance (Rct), as depicted in Table 4, hence higher susceptibility to corrosion.…”

Section: Electrochemical Measurementsmentioning

confidence: 77%

“…In other words, the lower double-layer capacitance (Cdl) value as observed in Table 4 shows that Cdl for the post-weld tempered samples decreases with the tempering process. The difference in electrochemical characteristics of the post-weld tempered steel can be attributed to the change in mechanical properties and micro-structural re-crystallization that occur as a result of post-weld tempering [27].…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Assessment of Corrosion Resistance Potentials of Welded and Tempered UNS G10400 Carbon Steel in a Seawater Environment

Okuma,

Oreko

2024

Chemistry Africa

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Welded joints sometimes exhibit poor corrosion resistance, due to variation in chemical composition at the weld surface or Heat Affected Zone (HAZ), induced stress and the microstructure formation. There is a need to enhance welds corrosion resistance and microstructural properties of such joints through post weld tempering (PWT). In this study, PWT effect on the corrosion resistance and microstructure properties of UNS G10400 carbon steel was investigated. The UNS G10400 samples, were cut to the desired dimensions, welded by means of electric metal arc welding process and subjected to PWT, at 550ºC, 650ºC, and 700ºC, for 1 h, respectively. The samples were immersed in seawater environment and its corrosion resistance and microstructure properties were then evaluated, using gravimetric technique, Open Circuit Potential (OCP), Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS) and Scanning Electron Microscope (SEM)/ Energy-Dispersive X-ray Spectroscopy (EDX), respectively. The ndings show that the post-weld tempered (PWT) samples exhibited higher corrosion resistance compared to the as-welded samples. The corrosion rate values are 0.1351, 0.06331, 0.06271 and 0.01578mm/year for as-welded, PWT-550 0 C, PWT-650 0 C and PWT-700 0 C samples respectively. The SEM/EDX images of PWT samples revealed an increased in grain size, forming a tempered martensite. These results are due to re-crystallization and grain growth resulting from post-weld tempering. Therefore, an appropriate post weld tempering for UNS G10400 carbon steel welded joints is recommended for advanced industrial applications.

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“…After the WM of the AW sample with butt joint has been subjected to full annealing, micrograph in Fig.9(d) was obtained. The pearlitic phase dissolved thereby making the carbon atoms to diffuse uniformly in the ferritic phase forming coarse ferrite structure and some colonies of pearlite [20].…”

Section: Microstructure Examinationmentioning

confidence: 99%

Distinctiveness of Welding Joints Design Based on Mechanical and Corrosion Environmental Influence on Low Carbon Steel

et al. 2019

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Experimental investigations were carried out to study the effect of weld joint designs and post weld heat treatment (PWHT) on mechanical and corrosion properties of low carbon steel. Butt, bevel and half-lap joints were produced with a voltage of 20 V and current of 110 A with the use of 3.2 mm diameter electrode E6013. Full annealing was carried out on part of the welded samples in order to consider the possibility of post weld heat treatment for better performance. The mechanical properties (tensile, hardness, and impact toughness) were studied for both the as welded (AW) and PWHT samples as well as the corrosion performance in a natural sea water environment containing 3.5 wt.% NaCl using potentiodynamic polarization method. The microstructure of the AW and PWHT samples of the welded joints with the most promising mechanical and corrosion properties were then characterized by means of an optical microscopy. The results obtained reveals that the bevel joint followed by half lap joint and the butt joint of the as weld samples gave the best combination of the mechanical properties considered. On the other hand, the corrosion properties of the butt joint were superior to that of the bevel and half lap joint, respectively in the PWHT condition as compared to the AW samples. This implies that PWHT improves the corrosion resistance of the welded steel joints.

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Performance Evaluation of the Effects of Post Weld Heat Treatment on the Microstructure, Mechanical and Corrosion Potentials of Low Carbon Steel

Cited by 6 publications

References 11 publications

Post-heat treatment of electrochemically carburized low-carbon steel

Post-heat treatment of electrochemically carburized low-carbon steel

Assessment of Corrosion Resistance Potentials of Welded and Tempered UNS G10400 Carbon Steel in a Seawater Environment

Distinctiveness of Welding Joints Design Based on Mechanical and Corrosion Environmental Influence on Low Carbon Steel

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