Effect of welding speed on microstructure, hardness and tensile properties in laser welding of advanced high strength steel

Zhao, Yi; Zhang, Y S; Hu, Wenbin

doi:10.1179/1362171813y.0000000140

Cited by 43 publications

(14 citation statements)

References 23 publications

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“…Xu et al and Lakshminarayana et al found that the softer fusion zone formed in laser welding consists mainly of martensite, ferrite, and bainite; an almost fully martensite structure was observed, attributable to the faster cooling rate [23,24]. Zhao et al studied how laser welding speed affects the microstructure and properties of DP steels of 600, 800, and 1000 MPa grades; they concluded that a linear relationship existed between the carbon equivalent and the hardness of the fusion zone [25]. Wang et al studied laserwelded joints of DP1000 steel, and concluded that they were softened by the tempering and softening of pre-existing martensite and by carbide precipitation [26,27].…”

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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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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“…Some authors observed, in addition to martensite, portions of ferrite and bainite in this region ( Alves et al., 2018 ; Correard et al., 2016 ; Zhao et al., 2013 ). In general, FZ hardness presents directly linear relationship with the carbon equivalent of the steel ( Zhao et al., 2013 ).…”

Section: Introductionmentioning

confidence: 91%

Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Mansur¹,

Mansur²,

Carvalho

et al. 2021

Heliyon

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Dual Phase steels are one of the most used advanced high-strength materials in the industry, due to its combination of a ductile ferritic matrix and disperse hard martensite islands, which provide outstanding mechanical properties for components to be cold stamped. This work investigated fiber laser welding applicability in Dual Phase 600 1.6 mm thick steel sheets, evaluating potential welding impacts on properties of the material for industrial applications. A first set of bead-on-plate welds was generated to define best parameters for subsequent tests. A second set was prepared, consisting of butt joints welded in the optimized condition. Weld microstructure was characterized as 100% martensitic at fusion zone (FZ), with growing fractions of ferrite at Heat Affected Zone (HAZ) as one moves away from fusion line. Hardness is around 60% higher at FZ than at BM, being maximum at supercritical HAZ due to its highly refined microstructure and HAZ softening was not observed. Tensile and Erichsen cupping tests presented similar strength results between welded and non-welded specimens, with slight ductility reduction. Finally, numeric simulations based on Finite Element Analysis were carried out to estimate temperature evolution, phase proportions, residual stresses and distortion levels, achieving excellent agreement with experimental results.

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“…The tempering martensite caused softening in the HAZ of the DP980 steels [35,36]. The volume of martensite in base metal affected the size of softening [37]. As EBW was carried out in vacuum atmospheric, the air contact of the samples was delayed and the cooling process became slower.…”

Section: Tensile Strength Testmentioning

confidence: 99%

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Sezgin

Hayat

2020

Soldag. insp.

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TRIP 800 steel and DP 1000 steel welded by using the electron beam welding (EBW) method were investigated in this study. Martensite was a dominant phase at the fusion zone (FZ) of both steels. In addition, bainite and austenite were observed in the FZ of TRIP 800. The hardness of FZ and heat affected zone (HAZ) of both steels were higher than their base metals. The hardness of FZ of the TRIP 800 joinings was higher than the FZ of DP 1000. Ductility and tensile strength decreased at both of the joinings. However, this decrease became higher at the DP 1000 steel joinings compared to the TRIP 800 joinings. It was observed that the TRIP 800 joining absorbed more energy than the DP 1000 joining at impact notch test for each temperature.

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Effect of welding speed on microstructure, hardness and tensile properties in laser welding of advanced high strength steel

Cited by 43 publications

References 23 publications

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

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

Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

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