Failure analysis of dissimilar weld in heat exchanger

Corleto, Carlos R.; Argade, Gaurav

doi:10.1016/j.csefa.2017.05.003

Cited by 27 publications

(12 citation statements)

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“…Low carbon steel normally has good weldability, and the welding of high strength steels produces a softened zone where the strain is concentrated making it vulnerable to HSC initiation. Furthermore, the welding microstructures have high hardness, such as MA constituent and martensite, accelerate hydrogen embrittlement [16][17][18]. In the case of dissimilar-welded joints in DSS and carbon steel, the ferrite phase fraction is increased in the heat affected zone (HAZ) of the DSS and the softened HAZ of high-strength carbon steels.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Park

Moon

et al. 2021

Metals

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As the need for duplex stainless steel (DSS) increases, it is necessary to evaluate hydrogen stress cracking (HSC) in dissimilar welded joints (WJs) of DSS and carbon steel. This study aims to investigate the effect of the weld microstructure on the HSC behaviour of dissimilar gas-tungsten arc welds of DSS and carbon steel. In situ slow-strain rate testing (SSRT) with hydrogen charging was conducted for transverse WJs, which fractured in the softened heat-affected zone of the carbon steel under hydrogen-free conditions. However, HSC occurred at the martensite band and the interface of the austenite and martensite bands in the type-II boundary. The band acted as an HSC initiation site because of the presence of a large amount of trapped hydrogen and a high strain concentration during the SSRT with hydrogen charging. Even though some weld microstructures such as the austenite and martensite bands in type-II boundaries were harmless under normal hydrogen-free conditions, they had a negative effect in a hydrogen atmosphere, resulting in the premature rupture of the weld. Eventually, a premature fracture occurred during the in situ SSRT in the type-II boundary because of the hydrogen-enhanced strain-induced void (HESIV) and hydrogen-enhanced localised plasticity (HELP) mechanisms.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Park

Moon

et al. 2021

Metals

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“…From the examples given in the section on stress corrosion, the cracks discussed in several publications were intergranular (Turissini et al, 1997;Guo et al, 2011;Corleto & Argade, 2017). Intergranular cracks (without the application of stresses) were found in the cases discussed by Ifezue and Tobins (2015) (together with pitting) and Chandra et al (2010).…”

Section: Intergranular Corrosionmentioning

confidence: 99%

“…This acid, in combination with internal stresses in the bend, induced the cracks in the metal (type 321 steel), shown in the photograph of Figure 9. Several other examples of stress corrosion causing the failure of heat exchangers can be found in the literature for both shell-and-tube heat exchangers (Otegui & Fazzini, 2004;Guo et al, 2011;Qu et al, 2011;Ravindranath et al, 2012;El-Amoush et al, 2014;Corte et al, 2015;Xu et al, 2015;Corleto & Argade, 2017) and plate heat exchangers (Turissini et al, 1997;Traubert & Jur, 2012;Khodamorad et al, 2016). For two of these cases, it concerns corrosion fatigue (Otegui & Fazzini, 2004;Ravindranath et al, 2012), while in the others, SCC was the main cause of failure.…”

Section: Stress Corrosionmentioning

confidence: 99%

Corrosion and corrosion prevention in heat exchangers

et al. 2019

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In many industries and processes, heat exchangers are of vital importance as they are used to transfer heat from one fluid to another. These fluids can be corrosive to heat exchangers, which are usually made of metallic materials. This paper illustrates that corrosion is an important problem in the operation of heat exchangers in many environments, for which no straightforward answer exists. Corrosion failures of heat exchangers are common, and corrosion often involves high maintenance or repair costs. In this review, an overview is given of what is known on corrosion in heat exchangers. The different types of corrosion encountered in heat exchangers and the susceptible places in the devices are discussed first. This is combined with an overview of failure analyses for each type of corrosion. Next, the effect of heat transfer on corrosion and the influence of corrosion on the thermohydraulic performances are discussed. Finally, the prevention and control of corrosion is tackled. Prevention goes from general design considerations and operation guidelines to the use of cathodic and anodic protection.

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“…Dicho desarrollo y disponibilidad de nuevos materiales, y en la búsqueda de optimizar la correcta selección de mismos, en este último tiempo se está volviendo relevante el concepto de soldadura disímil, por cuestiones económicas [5]. La soldadura disímil está asociada a la soldadura entre aceros diferentes [6,7]. En este sentido, la soldadura de aceros diferentes, es más desafiante que la de aceros similares, por las diferencias en las composiciones químicas y microestructuras (con diferentes coeficientes de expansión térmica), lo cual genera zonas con distintas composiciones químicas, microestructuras, tensiones residuales, etc.…”

Section: Introductionunclassified

Soldadura GMAW-PP disimil entre aceros inoxidables ASS, LDSS y DSS

Maidana¹,

Zappa²

2020

Proceedings of the 18th LACCEI International Multi-Conference for Engineering, Education, and Technology: Engineering, Integrat

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Thanks to the development of different materials (in type and grade) and due to a matter of optimizing the selection of materials (in properties and costs), the concept of dissimilar welding arises, which is associated with welds between different steels. The objective of this work is to study the microstructure and mechanical properties of dissimilar welds between plates of austenitic stainless steels (AISI 304L), lean duplex (LDX 2101) and duplex (DX 2205), by using the semiautomatic process with protection inert gas and double pulsed arc, using as filler material a solid duplex stainless steel wire. For this purpose, three welding coupons (A-L; AD ; L-D) with double pulsed arc were welded and cross sections were made for chemical and microstructural characterization, using optical emission spectrometry, light microscopy and scanning electron microscopy, respectively. For mechanical characterization, hardness sweeps were performed on the cross sections, and tensile specimens were mechanized and tested at room temperature. The obtained mechanical results show a significant decrease in the hardness in the heat-affected zone of the austenitic steel and a greater tensile strength in the dissimilar weld between L-D.

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Failure analysis of dissimilar weld in heat exchanger

Cited by 27 publications

References 1 publication

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Corrosion and corrosion prevention in heat exchangers

Soldadura GMAW-PP disimil entre aceros inoxidables ASS, LDSS y DSS

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