Microstructure and mechanical properties of keyhole plasma arc welded dual phase steel DP600

Kuril, Amit A.; Ram, G.D. Janaki; Bakshi, Srinivasa Rao

doi:10.1016/j.jmatprotec.2019.02.018

Cited by 22 publications

(10 citation statements)

References 24 publications

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“…4b). A Cottrell atmosphere is created by the diffusion of interstitial atoms, such as carbon or nitrogen, leading to the obstruction of dislocations and is very likely to occur during the welding process [14]. Significant strain hardening was observed in all specimens irrespective of the welding condition until the ultimate tensile strength (UTS) was reached.…”

Section: Tensile Properties Of the Weldmentioning

confidence: 99%

Continuous Drive Friction Welding of AISI 8630 Low-Alloy Steel: Experimental Investigations on Microstructure Evolution and Mechanical Properties

Banerjee

Ntovas

Silva

et al. 2021

Journal of Manufacturing Science and Engineering

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Continuous drive friction welding (CDW) is a state-of-the-art solid-state welding technology for joining metallic components used in aerospace, oil and gas and power generation industries. This study summarises the results of mechanical and microstructural investigations on a modified AISI-8630 steel subjected to CDW. The effects of welding process parameters, including rotational speed, friction and forge forces, during CDW were explored to determine an optimum welding condition. The mechanical properties of the weld, and microstructural characteristics across different regions of the weld were measured and examined. The microstructure characterisation results suggest that the weld zone (WZ) experiences temperatures above Ac3 and the thermo-mechanically affected zone (TMAZ) experiences temperatures between Ac1 and Ac3 of the material. Investigations with electron backscatter diffraction (EBSD) demonstrated the occurrence of strain-induced dynamic recrystallisation in the weld. The weld demonstrated higher yield and ultimate tensile strengths at the expense of ductility and hardening capacity compared to the base metal (BM). The strain hardening profiles of the welds exhibited a dual-slopes characteristic, an indication of different levels of plastic deformation experienced by the constituent phases (i.e., martensite, bainite and ferrite) present in the microstructure. The maximum strength-to-ductility combination and static toughness values were obtained for the weld produced under the highest rotational speed, maximum friction force and an intermediate forge force of 1200-1400 rpm, 37.5-42.5 kN and 60-65 kN, respectively.

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Section: Tensile Properties Of the Weldmentioning

confidence: 99%

Continuous Drive Friction Welding of AISI 8630 Low-Alloy Steel: Experimental Investigations on Microstructure Evolution and Mechanical Properties

Banerjee

Ntovas

Silva

et al. 2021

Journal of Manufacturing Science and Engineering

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“…The assessment of the structural integrity of pipe welds plays an essential part in the design of piping systems and quality assuring future performance in-service. The conventional fusion welding process results in a localised heterogeneity in the microstructure at the fusion zone, which makes the weld more susceptible to cracking and premature failure under extreme environmental conditions [4]. Hence, when optimising the process parameters, it is imperative to understand the extent of microstructure evolution during welding and establish structure-property correlations.…”

Section: Introductionmentioning

confidence: 99%

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

Banerjee

Ntovas

Silva

et al. 2021

Archiv.Civ.Mech.Eng

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The evolution of microstructure and mechanical properties in AISI 8630 low-alloy steel subjected to inertia friction welding (IFW) have been investigated. The effects of three critical process parameters, viz. rotational speed, friction and forge forces, during welding of tubular specimens were explored. The mechanical properties of these weld joints, including tensile and Charpy V-notch impact were studied for determining the optimum welding parameters. The weld joints exhibited higher yield strength, lower hardening capacity and ultimate tensile strength compared to base metal (BM). The maximum strength and ductility combination was achieved for the welds produced under a nominal weld speed of ~ 2900–3100 rpm, the highest friction force of ~ 680–720 kN, and the lowest axial forging load of ~ 560–600 kN. The measured hardness distribution depicted higher values for the weld zone (WZ) compared to the thermo-mechanically affected zone (TMAZ), heat-affected zone (HAZ) and BM, irrespective of the applied welding parameters. The substantial increase in the hardness of the WZ is due to the formation of microstructures that were dominated by martensite. The observed microstructural features, i.e. the fractions of martensite, bainite and ferrite, show that the temperature in the WZ and TMAZ was above Ac3, whereas that of the HAZ was below Ac1 during the IFW. The fracture surface of the tensile and impact-tested specimens exhibited the presence of dimples nucleating from the voids, thus indicating a ductile failure. EBSD maps of the WZ revealed the formation of subgrains inside the prior austenite grains, indicating the occurrence of continuous dynamic recrystallisation during the weld. Analysis of crystallographic texture indicated that the austenite microstructure (i.e. FCC) in both the WZ and TMAZ undergoes simple shear deformation during IFW.

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“…The mechanical properties of DP steels depend on martensite volume fraction, martensite islands distribution in the ferrite phase, shape and grain sizes and partitioning of stress-strain between two phases [1,2]. DP steel can be welded using a variety of fusion techniques, including resistance spot [3][4][5][6][7], laser beam [8][9][10][11], plasma arc [12][13][14], friction stir [15][16][17][18] and gas metal arc welding. Xia and Biro investigated the effects of heat input on heat affected zone (HAZ) softening [19], which cannot be avoided in DP steels.…”

Section: Introductionmentioning

confidence: 99%

The comparison of gas tungsten arc welding and flux cored arc welding effects on dual phase steel

Abbas

Hamdy²,

Ahmed

2020

Mater. Res. Express

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This work aims to investigate the effects of two welding techniques (gas tungsten arc welding (GTAW) with filler metal ER70S-3 and flux cored arc welding (FCAW) with filler metal E71T1C) on the microstructure and mechanical properties (including softening due to the conversion of martensite into tempered martensite) of DP steels with different martensite volume fractions ranging from 9 to 20%. Microstructure features and the constituents of base metals and heat affected zones of all weldments were examined and analyzed using an optical microscope and a scanning electron microscope integrated with energy-dispersive x-ray spectroscopy. Hardness, tensile, and v-notch impact toughness measurements were also carried out. Visual and radiographic inspection showed that both the FCAW and GTAW techniques produced sound weldments. However, DP steel weldments exhibited softening effects, which led to a decrease in joint efficiency. This decrease were related to transformation of the original martensite into tempered martensite. The results also revealed that the DP steel joints efficiencies are ranged from 85.9 to 87.7% using the FCAW process and ranged from 83.3 to 86% using the GTAW process. The impact toughness of the samples welded by FCAW is higher than the impact toughness of those welded by GTAW due to a higher percentage of acicular ferrite. This information should be valuable in the automotive and other industries, where DP steels are valued for their combination of high strength and ductility, which leads to weight savings and thus to reduced fuel consumption.

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Microstructure and mechanical properties of keyhole plasma arc welded dual phase steel DP600

Cited by 22 publications

References 24 publications

Continuous Drive Friction Welding of AISI 8630 Low-Alloy Steel: Experimental Investigations on Microstructure Evolution and Mechanical Properties

Continuous Drive Friction Welding of AISI 8630 Low-Alloy Steel: Experimental Investigations on Microstructure Evolution and Mechanical Properties

Inter-relationship between microstructure evolution and mechanical properties in inertia friction welded 8630 low-alloy steel

The comparison of gas tungsten arc welding and flux cored arc welding effects on dual phase steel

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