Influence of heat input on microstructure and fracture toughness property in different zones of X80 pipeline steel weldments

Singh, Mayur Pratap; Arora, Kanwer Singh; Kumar, Rajneesh; Shukla, Dinesh Kumar; Prasad, Sanjay

doi:10.1111/ffe.13333

Cited by 13 publications

(7 citation statements)

References 35 publications

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“…Coarse inclusion particles in high magnification impact tested fractographs of steels A and B welded with MAG were revealed as Fe-Mn-Si carbides from spot EDS 7 and 8 (Figure 17a–d). Inclusions of variable size have been reported to decrease toughness properties in low alloy steels (Singh et al. , 2021).…”

Section: Resultsmentioning

confidence: 99%

The influence of CMT-MAG and MAG welding-processes on microstructure and mechanical behaviour of C-Mn E410 structural-steels

Khajuria,

Misra,

Shiva

2024

IJSI

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PurposeAn experimental investigation for developing structure-property correlations of hot-rolled E410 steels with different carbon contents, i.e. 0.04wt.%C and 0.17wt.%C metal active gas (MAG) and cold metal transfer (CMT)-MAG weldments was undertaken.Design/methodology/approachMechanical properties and microstructure of MAG and CMT-MAG weldments of two E410 steels with varying content of carbon were compared using standardized mechanical testing procedures, and conventional microscopy.Findings0.04wt.%C steel had strained ferritic and cementite sub-structures in blocky shape and large dislocation density, while 0.17wt.%C steel consisted of pearlite and polygonal ductile ferrite. This effected yield strength (YS), and microhardness being larger in 0.04wt.%C steel, %elongation being larger in 0.17wt.%C steel. Weldments of both E410 steels obtained with CMT-MAG performed better than MAG in terms of YS, ultimate tensile strength (UTS), %elongation, and toughness. It was due to low heat input of CMT-MAG that resulted in refinement of weld metal, and subzones of heat affected zone (HAZ).Originality/valueA substantial improvement in YS (∼9%), %elongation (∼38%), and room temperature impact toughness (∼29%) of 0.04wt.%C E410 steel is achieved with CMT-MAG over MAG welding. Almost ∼10, ∼12.5, and ∼16% increment in YS, %elongation, and toughness of 0.17wt.%C E410 steel is observed with CMT-MAG. Relatively low heat input of CMT-MAG leads to development of fine Widmanstätten and acicular ferrite in weld metal and microstructural refinement in HAZ subzones with nearly similar characteristics of base metal.

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Section: Resultsmentioning

confidence: 99%

The influence of CMT-MAG and MAG welding-processes on microstructure and mechanical behaviour of C-Mn E410 structural-steels

Khajuria,

Misra,

Shiva

2024

IJSI

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“…Depending on the peak temperature experienced, HAZ is further divided into the near/far HAZs, depending on their relative distance from the center of the FZ and the peak temperature. 18 Digital image correlation (DIC) techniques have been employed to investigate the strain response of different regions for the welded joints when subjected to uniaxial loadings. 9,10,[19][20][21] The objective of this investigation is to evaluate the microstructural evolution and mechanical properties of weathering steels welded joints (Q450NQR1 and Q450AWR5).…”

Section: Introductionmentioning

confidence: 99%

“…During the welding process, heat flows from the weld metal to the surrounding base material, resulting in a narrow HAZ. Depending on the peak temperature experienced, HAZ is further divided into the near/far HAZs, depending on their relative distance from the center of the FZ and the peak temperature 18 . Digital image correlation (DIC) techniques have been employed to investigate the strain response of different regions for the welded joints when subjected to uniaxial loadings 9,10,19–21 …”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Cong

Liu

Huang

et al. 2022

Fatigue Fract Eng Mat Struct

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The microstructural evolution and mechanical properties of welded joints for Q450NQR1 and Q450AWR5 alloys were investigated. The inhomogeneous microstructures of Q450NQR1 and Q450AWR5 welded joints can result in heterogeneous mechanical responses. Microhardness distributions of the two welded joints are not uniform with the highest hardness value in the FZ, followed by the HAZ, and the lowest hardness value in the BM. The tensile strength of Q450AWR5 welded joints is slightly higher than the Q450NQR1 welded joints. The tensile fracture occurred in the BM of both welded joints, probably due to the strengthening effect of bainite with high dislocation density and lattice distortion. The fatigue life is dominated by the welded defects inside the welded joint. The location of fatigue failure occurs mainly near the fusion zone and is limited by the welded defects, independent of the microstructure.

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“…Pipeline steel is playing an increasingly important role in energy transportation with the progress of modern industries [1][2][3][4]. X80 pipeline steel, as a low carbon low-alloyed steel, has high stress-bearing capacity, strong plasticity, and good weldability.…”

Section: Introductionmentioning

confidence: 99%

Galvanic corrosion of X80 pipeline steel double‐sided submerged arc welded joints in simulated near‐neutral soil solution

Wang

Zhao

Wang

et al. 2022

Materialwissenschaft Werkst

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The corrosion behaviors of double‐sided submerged arc welded joints in X80 pipeline steel with or without coupling were studied in simulated near‐neutral soil solution. The galvanic effect in the welded joint was evaluated by corrosion morphology, corrosion depth, and electrochemical measurements. When the weld metal (WM), heat affected zone (HAZ) and base metal (BM) samples were immersed in the solution isolated, pitting holes occurred around the martensite/austenite constituents in the weld metal and base metal samples, which was mainly due to the preferential corrosion of ferrite. However, no pitting holes occurred in the heat affected zone due to small specific surface area induced by the coarse martensite/austenite constituents. Polarization curves results showed that the corrosion current density of coupled base metal was 5 times larger than that of isolated base metal and the corrosion current density of isolated heat affected zone was three times larger than that of coupled heat affected zone after 48 h immersion. The corrosion current density of coupled heat affected zone was one order of magnitude lower than that of coupled weld metal and base metal. When the welded joint was exposed to an aggressive environment, the base metal samples were determined to be the most anodic zone while the heat affected zone was the most cathodic zone. The weld metal underwent little galvanic interaction, as its corrosion potential was close to the coupled potential. In addition, the galvanic effect among the welded joints decreased with the prolong of immersion time.

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Influence of heat input on microstructure and fracture toughness property in different zones of X80 pipeline steel weldments

Cited by 13 publications

References 35 publications

The influence of CMT-MAG and MAG welding-processes on microstructure and mechanical behaviour of C-Mn E410 structural-steels

The influence of CMT-MAG and MAG welding-processes on microstructure and mechanical behaviour of C-Mn E410 structural-steels

Microstructure evolution and mechanical properties of two kinds of weathering steel welded joints

Galvanic corrosion of X80 pipeline steel double‐sided submerged arc welded joints in simulated near‐neutral soil solution

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