Effect of the structure on the mechanical properties and cracking resistance of welded joints of low-alloyed high-strength steels

Berdnikova, О.М.; Pozniakov, V.; Bernatskyi, Artemii; Alekseienko, T.; Sydorets, Volodymyr

doi:10.1016/j.prostr.2019.07.026

Cited by 27 publications

(23 citation statements)

References 35 publications

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“…Although presenting an advantage of lower volume of deposited weld metal, the application of square groove geometry can promote deleterious effects on the mechanical properties due to the higher dilution with base metal [1,3,[38][39][40]. It is seen in Fig.…”

Section: Mechanical and Microstructural Properties Of The Welded Jointmentioning

confidence: 99%

“…Based on the improvement of the thermo-mechanical processing routes and heat treatments, high-strength low-alloy (HSLA) steels have been developed to several applications in oil and gas, shipbuilding, and pipeline industries where frequently thick steel products are used [1,2]. Since welding is usually applied in manufacturing and repair operations of industrial components [3], the development of new welding processes, aiming for improvement of productivity allied with quality and low costs, has been motivated. In this respect, it is known that GMAW (gas metal arc welding) process is widely used at most diverse applications, due to its characteristics of high deposition rate, versatility, easily adaptable for automation and relatively low cost in comparison with other electric arc processes [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

Silveira

Filho

Costa

et al. 2020

Int J Adv Manuf Technol

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The MCAW process with rotating electrode (MCAW-RE) is a variation of the conventional gas metal arc welding process, which a metal-cored wire is submitted to a rotational movement along a pre-established diameter. This process enhances narrow gap welding, since the rotational motion of the electrode allows the electric arc to reach peripheral regions of the groove, preventing lack of fusion on the sidewall. As a result, reduced costs and superior productivity compared with the conventional GMAW process are obtained. The limited literature about this process is focused on the operational characteristics, and works studying the mechanical properties are not available. Thus, this work evaluates the mechanical and microstructural properties of weld metals obtained by the MCAW-RE process in order to allow a decision about its technical feasibility to replace the GMAW process in industry. Initially, beads on plate weld tests were performed with varying rotation frequency and rotation diameter, in order to determine the parameters to be used in welded joints. High-strength steel weld metals were obtained by welding performed in steel plates with dimensions of 500 × 300 × 10 mm. Mechanical tests and metallographic examination were carried out in samples removed transversally to the weld bead. The results showed that the impact toughness of the weld metals can achieve the requirements for several industrial applications. The results showed that the GMAW process with rotating electrode-cored wire has a high potential for replacement of the GMAW in industrial applications.

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Section: Mechanical and Microstructural Properties Of The Welded Jointmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

Silveira

Filho

Costa

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…The perspective of the wide application of HSLA steels in engineering constructions has led to extended research on the welded joints prepared with these grades of steel [26][27][28][29][30]. High-strength low-alloy steels, due to their specific microstructure and alloying design, are sensitive to welding and the full benefit of applications of those steels can only be obtained by suitable welding [28].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Examination of HSLA Steel with Yield Strength of 960 MPa and Its Welded Joints under Strain Mode

Ślęzak

2020

Metals

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The full benefits of application the high strength low alloyed steels HSLA can be achieved if the structures will be able to carry the alternate loads and fatigue cracks will not be formed, even in the vicinity of welded joints. For this reason the purpose of this study is to find and to explain the influence of different factors on fatigue crack initiation and the nature of crack propagation in HSLA steel and its welded joints. The S960QL steel and two types of welded joints were subjected to low cycle fatigue (LCF) tests at a strain mode and the received surfaces of fractures were analyzed using SEM microscope. Additionally, the microhardness measurements and the residual stress analyze in a cross-section of the joint were conducted. The maximum hardness was determined on the fusion line and more favorable hardness distribution was in the square joints than in single-V. Compiled maps of residual stresses have shown that the local orientation and values of the principal stress vector near the fusion line can influence negative the fatigue life. Finally, the square joints tested in the low cycle fatigue regime have shown a slightly higher fatigue life in comparison with single-V.

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“…It is commonly known that the relationship between the structure and properties of metals is the main goal of material science [1][2][3][4]. In particular, there are several mechanisms which determine the strength of steel: dislocation, solid solution, dispersion precipitation, and grain boundary strengthening.…”

Section: Introductionmentioning

confidence: 99%

Shear impact during steel wire drawing on grain boundaries and mechanical properties

Zavdoveev

Baudin

Rogante³

et al. 2020

Lett. Mater.

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Shear deformation is one of the effective ways for grain boundary engineering. In the current contribution, the effect of the shear deformation incorporated into the conventional drawing process is shown. A specific feature of this experimental technology is a reduction of the structural anisotropy. This effect is related to the application of dies with shear that makes the metal flow to change its direction. In particular the grain refinement is stronger. The experimental drawing technology results in an extensive increase in the fraction of small grains (less than 3 μm in size) and a decrease in the fraction of large grains. A large amount of small grains with high-angle boundaries in this case is registered. The formation of this kind of grains is explained by progress in competing processes of large grain fragmentation and continuous dynamic recrystallization. The result is the change of the type of the grain boundaries from smooth to serrated ones and the formation of unclosed high-angle grain boundaries. Besides, it has been demonstrated that a certain part of small grains provides grain boundary sliding. The comparative analysis of the hardness tests has demonstrated increasing hardness with deformation accumulation, but after the classical drawing, the hardness grows linearly and stepwise after the experimental shear drawing. The physical reasons of such behaviour are explained by microstructural features which are discussed in current contribution.

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Effect of the structure on the mechanical properties and cracking resistance of welded joints of low-alloyed high-strength steels

Cited by 27 publications

References 35 publications

Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

Influence of rotation frequency and rotation diameter on mechanical properties and microstructure of weld metal produced by MCAW-RE

Fatigue Examination of HSLA Steel with Yield Strength of 960 MPa and Its Welded Joints under Strain Mode

Shear impact during steel wire drawing on grain boundaries and mechanical properties

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