Quenched and tempered steel welded with micro-alloyed based ferritic fillers

Sharma, Varun; Shahi, A. S.

doi:10.1016/j.jmatprotec.2017.10.039

Cited by 15 publications

(16 citation statements)

References 15 publications

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“…The resulting microstructure of this area is the mixture of martensite, ferrite and tempered martensitesimilar to other studies [7,16]. According to other authors, the ICHAZ is the weakest area in the welded quenched and tempered steels [18]. The width of the ICHAZ was approximately 750 µm.…”

Section: Rezultati I Diskusija 31 Makrostruktura I Mikrostrukturasupporting

confidence: 85%

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Changes of microstructure and mechanical properties of the HAZ of the S960MC steel sheet weld joint

Mičian¹,

Marônek²,

Konar³

et al. 2020

Zavariv zavar konstrukcije

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The TMCP (thermo-mechanically controlled processed) steels belong to the group of ultra-high strength steels, which exhibit exceptional combination of high tensile and yield strength, toughness and ductility. These steels were introduced in the heavy machinery constructions, such as heavy mobile cranes, chassis trucks and other to reduce their weight, what increases their loading capacity and ecology of transport. The high tensile and yield strength of this type of steels is obtained by the combination of the chemical composition, heat treatment and the mechanical processing. However, the heat input into the material during the welding significantly affect properties of the steel and the whole joint. In this paper are presented results of mechanical properties evaluation and structural analysis of the welds of the thin sheets made of the S960MC steel, which were welded using the GMAW procedure. The microstructural evaluation referred significant changes in the HAZ. This area contains the three sub-zones, coarse grain (CGHAZ), fine grain (FGHAZ) and intercritical zone (ICHAZ). Analysis of microhardness and the tensile tests results showed, that ICHAZ is the most critical area of the whole welded joint.

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Section: Rezultati I Diskusija 31 Makrostruktura I Mikrostrukturasupporting

confidence: 85%

“…Finalnu strukturu u ovom području čine martenzit, ferit i otpušteni martenzit, što je u saglasnosti sa rezultatima drugih autora [7,16]. Prema nekim autorima ICHAZ je najslabije područje u kaljenim i otpuštenim čeliima [18]. Širina zone ICHAZ je procenjena na 750µm.…”

Section: Rezultati I Diskusija 31 Makrostruktura I Mikrostrukturaunclassified

Changes of microstructure and mechanical properties of the HAZ of the S960MC steel sheet weld joint

Mičian¹,

Marônek²,

Konar³

et al. 2020

Zavariv zavar konstrukcije

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“…One of the most recent techniques of welding is friction stir welding (FSW), which has great relevance in the industry because it has the potential ability to join dissimilar materials. Recent studies have focused on improving the properties of this technique, seeking a better appearance and defect-free joints [138]. The appearance of the weld and the reduction of the defects can be controlled by the tool rotation rate.…”

Section: Microalloyed Steels Weldingmentioning

confidence: 99%

“…The appearance of the weld and the reduction of the defects can be controlled by the tool rotation rate. Liu et al studied the parameters involved to improve the welding of aluminum alloy with copper and determined that the best appearance was obtained under the condition of tool rotation rate of 600 or 1000 rev min −1 , welding speed of 100 mm min −1 , tool offset of zero and Cu sheet on the AS [138]. In Figure 23, an example of a weld with defects and poor appearance (Figure 23a) and a defectless weld with good appearance can be seen (Figure 23b).…”

Section: Microalloyed Steels Weldingmentioning

confidence: 99%

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Villalobos

Del-Pozo

Campillo

et al. 2018

Metals

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Microalloyed steels have evolved in terms of their chemical composition, processing, and metallurgical characteristics since the beginning of the 20th century in the function of fabrication costs and mechanical properties required to obtain high-performance materials needed to accommodate for the growing demands of gas and hydrocarbons transport. As a result of this, microalloyed steels present a good combination of high strength and ductility obtained through the addition of microalloying elements, thermomechanical processing, and controlled cooling, processes capable of producing complex microstructures that improve the mechanical properties of steels. These controlled microstructures can be severely affected and result in catastrophic failures, due to the atomic hydrogen diffusion that occurs during the corrosion process of pipeline steel. Recently, a martensite-bainite microstructure with acicular ferrite has been chosen as a viable candidate to be used in environments with the presence of hydrogen. The aim of this review is to summarize the main changes of chemical composition, processing techniques, and the evolution of the mechanical properties throughout recent history on the use of microalloying in high strength low alloy steels, as well as the effects of hydrogen in newly created pipelines, examining the causes behind the mechanisms of hydrogen embrittlement in these steels.

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“…This category of materials offers the higher mechanical properties than standard grades of weldable structural steels, what allow to reach significant reductions of the total component's mass, as the cross-section of components can be reduced. Improved mechanical properties of the high strength low alloyed steels thanks to the carefully designed chemical composition together with the thermomechanical processing, resulting in the fine-grained microstructure of the final products [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

et al. 2018

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High strength low alloyed steels are nowadays an important group of engineering materials, with numerous industrial applications. Properly chosen chemical composition together with the thermomechanical processing allow to reach high mechanical properties, while the carbon content is maintained low. Resulting microstructure is therefore sensitive to the amount of the heat introduced to the metal during welding. During welding procedure, softening phenomenon can occur in the heat affected zones and it could lead to the degradation of the mechanical properties of the final joint. Nowadays, welding technologies based on the high energy electron beam are able to produce weld joints with very narrow heat affected zone. In this study, authors compare mechanical properties and the microstructural evolution in the heat affected zone of the GMAW and EB welded joint of the DOMEX 700MC HSLA steel. The carried out experiments showed that both evaluated technologies are able to produce joints with appropriate mechanical properties. Welded joints made by the EBW technique showed slightly better mechanical properties of the whole joint, as a result of the narrower HAZ.

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Quenched and tempered steel welded with micro-alloyed based ferritic fillers

Cited by 15 publications

References 15 publications

Changes of microstructure and mechanical properties of the HAZ of the S960MC steel sheet weld joint

Changes of microstructure and mechanical properties of the HAZ of the S960MC steel sheet weld joint

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Comparison of the mechanical properties and microstructural evolution in the HAZ of HSLA DOMEX 700MC welded by gas metal arc welding and electron beam welding

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