Influence of Heat Treatments on the Microstructure of Welded Api X70 Pipeline Steel

Digheche, K.; Boumerzoug, Zakaria; Diafi, Malika; Saadi, Khawla

doi:10.12776/ams.v23i1.879

Cited by 14 publications

(13 citation statements)

References 8 publications

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“…Many attempts have been made to analyse the microstructure of API X70 steel welded joints. However, there is a lack of a more systematic metallographic investigations comprising the base material, HAZ as well as weld metal with relation to mechanical properties [10][11][12][13][14][15][16][17][18][19][20]. Ghomashchi and co-workers [10] revealed that the microstructure of arc girth welded joint of the API X70 steel produced by the manual metal arc (MMA) welding with E6010 cellulosic electrodes are composed of Widmanstätten and acicular ferrites, lamellar pearlite and aggregated ferrite-carbide.…”

Section: Literature Surveymentioning

confidence: 99%

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A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Węglowski

Dymek

Kopyściański

et al. 2020

Archiv.Civ.Mech.Eng

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In the paper, the effect of welding technology on the microstructure and mechanical properties of girth welded joints was presented. Metallographic examinations based on light microscopy and SEM were conducted on girth welded joints of API X70 steel pipe. Research has shown that microstructure of the heat-affected zone (HAZ) of MMA girth welded joints is not homogeneous and depends on the thermal history of each area during the welding process. Near the fusion line the zone is coarse, and further away there is a fine-grained zone. In the area of root passes the microstructure consists of recrystallized ferrite grains unlike to cap passes where the fine bainitic microstructure can be observed. In the case of MAG girth welded joints, the weld microstructure consists of primary austenite grains. The primary austenite boundaries serve as nucleation sites of ferrite. The microstructure of the HAZ varies continuously from a coarse-to fine-grained microstructure of the base material. The results of mechanical properties of girth welded joints are also presented. The hardness and strength of arc welded joints depend on welding filler materials as well as welding technology. The results of hardness distribution of MMA and MAG girth welded joints confirmed the results of microstructural evaluation.

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Section: Literature Surveymentioning

confidence: 99%

“…The repairs have an influence on the HAZ width as well as on the grain size. The primary factors that affect the grain size are: temperature, holding time and microalloying elements [16]. Vega et al [17] found that an increase in the number of repairs may result in increasing the grain size.…”

Section: Literature Surveymentioning

confidence: 99%

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Węglowski

Dymek

Kopyściański

et al. 2020

Archiv.Civ.Mech.Eng

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“…The welded joints under exploitation conditions can be affected by the chemical heterogeneity or mechanical properties of base material, heat affected zone and weld metal. It has been concluded that by improving the microstructure of the HAZ, the properties of the welded joint can be improved [7]. Excessive heat input could result in a wide HAZ with low impact strength [8].…”

Section: Introductionmentioning

confidence: 99%

Simulated Heat Affected Zone in Welded Stainless Steel 304l

Hamza

Boumerzoug

Raouache³

et al. 2019

Acta Metall Slovaca

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<p>This work is a contribution study of the heat-affected zone in the real welded joint of stainless steel 304L. This zone was compared to the heat-affected zone obtained by using a thermal cycle simulation of welding. This experimental technique is based on thermal cycle simulation of welding by rapid heating and cooling treatments of the base metal in a specific simulation equipment. The samples were analyzed by scanning electron microscopy equipped with energy dispersive X-ray, and microhardness measurements. Microstructures and mechanical properties of the simulated heat affected zone were also determined. Thermal cycle simulation technique has revealed more details on the microstructure and the mechanical behavior of the heat-affected zone.</p>

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“…It has been concluded that by improving the microstructure of the HAZ, the properties of the welded joint can be improved [7].…”

Section: Controlling Of Hazmentioning

confidence: 99%

Heat Affected Zone in Welded Metallic Materials

Boumerzoug

2020

MCMS

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Welding is used extensively for pipe welding, aerospace, aviation, biomedical implants, fabrication of race cars, choppers, etc. Generally, the metallurgy of the welded joint performed by thermal fusion joining process can be categorized into two major regions, the fusion zone (FZ) and the heat-affected zone (HAZ). The heat-affected zone (HAZ) is a region that is thermally affected by the welding treatment. The main difficulty associated with welding is the prevention of unexpected deterioration of properties as a result of the microstructure evolutions which reduce the resistance to brittle fracture in the heat-affected zone (HAZ). Properties of the HAZ are different from those of the base material. According to the literature, the HAZ is the most problematic area in the high strength steels weld. For this reason, many research works investigated this critical zone in welded joint. The main research questions and results related to the HAZ will be presented.

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Influence of Heat Treatments on the Microstructure of Welded Api X70 Pipeline Steel

Cited by 14 publications

References 8 publications

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

A comprehensive study on the microstructure and mechanical properties of arc girth welded joints of spiral welded high strength API X70 steel pipe

Simulated Heat Affected Zone in Welded Stainless Steel 304l

Heat Affected Zone in Welded Metallic Materials

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