Characteristics of Nd:YAG Laser Welded Joints of Dual Phase Steel

Węglowski, M. S.; Kwieciński, K.; Krasnowski, Krzysztof; Jachym, Robert

doi:10.1016/s1644-9665(12)60072-7

Cited by 19 publications

(13 citation statements)

References 8 publications

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“…They consist of different soft and hard structural constituents in various proportions, which enable to obtain a very wide range of mechanical and technological properties. The microstructure of dual phase (DP) steel contains soft ferrite and hard martensite whereas the multiphase microstructure of TRIP (Transformation Induced Plasticity) steel consists of ferrite, bainite and retained austenite [1][2][3][4][5][6]. New demands of the automotive industry for relatively low-cost steel sheets characterized by tensile strength above 1,000 MPa require further searching of new chemical composition strategies.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Grajcar

Zalecki

Skrzypczyk

et al. 2014

J Therm Anal Calorim

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The work deals with dilatometric studies of a new-developed advanced high-strength bainitic 3Mn-1.5Al steel. Ferritic, bainitic and martensitic phase transformations are investigated in detail in respect of their temperature range forming and microstructures produced under various conditions of both continuous and isothermal cooling. The equilibrium temperatures of A e1 and A e3 and phase composition of the investigated steel were initially calculated whereas critical temperatures of A c1 and A c3 as well as the decomposition of retained austenite were determined upon heating. The major tests consisted of controlled cooling of undeformed or plastically deformed austenite using the dilatometer within the cooling rate range of 2-0.5°C s -1 . The effects of the cooling rate and deformation at temperatures of 900 and 1,050°C on the phase transformation behaviour and microstructure were explained. The final experiment was carried out using a thermo-mechanical simulator under conditions of multistep deformation and isothermal holding of the steel at 400°C. Microstructural features were revealed using light microscopy and scanning electron microscopy techniques.

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Section: Introductionmentioning

confidence: 99%

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Grajcar

Zalecki

Skrzypczyk

et al. 2014

J Therm Anal Calorim

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“…This development also involves extensive works focused on improving vehicle safety (Ref [1][2][3][4]. Basing on these assumptions, increasing amounts of high-strength low-alloyed (HSLA) and complex-phase steels (e.g., dual-phase, complex-phase, transformation-induced plasticity) are implemented in car bodies (Ref 5,6).…”

Section: Introductionmentioning

confidence: 99%

“…The use of high-strength steels enables the car structures production of thinner sheets. This results in reducing the total weight of vehicles and decreasing fuel consumption ( Ref 2,4,7). The appropriate selection of both chemical and phase compositions of modern steels makes it possible to forecast the behavior of car bodies during collisions, thus predicting passenger safety.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness Profiles of Bifocal Laser-Welded DP-HSLA Steel Overlap Joints

Grajcar

Matter

Stano

et al. 2017

J. of Materi Eng and Perform

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The article presents results related to the bifocal laser welding of overlap joints made of HSLA and DP high-strength steels. The joints were made using a disk laser and a head enabling the 50-50% distribution of laser power. The effects of the laser welding rates and the distance between laser spots on morphological features and hardness profiles were analyzed. It was established that the positioning of beams at angles of 0°o r 90°determined the hardness of the individual zones of the joints, without causing significant differences in microstructures of the steels. Microstructural features were inspected using scanning electron microscopy. Both steels revealed primarily martensitic-bainitic microstructures in the fusion zone and in the heataffected zone. Mixed multiphase microstructures were revealed in the inter-critical heat-affected zone of the joint. The research involved the determination of parameters making it possible to reduce the hardness of joints and prevent the formation of the soft zone in the dual-phase steel.

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“…S. Weglowski et al 9 reported that the maximum hardness in the fusion zone of 0.07C-1Mn-0.4Cr dual-phase steel (which belongs to the 1 st generation of AHSS) reaches 340 HV. The hardness increases to approximately 430 HV with increasing carbon and manganese contents in the 0.13C-1.3Mn-0.2Cr-0.2Cu steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of gas atmosphere on the non-metallic inclusions in laser-welded trip steel with Al and Si additions

Grajcar¹,

Różański²,

Kamińska³

et al. 2016

Mater. Tehnol.

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The present study aims to characterize the weldability of a multiphase, automotive steel containing Al and Si additions from the point of view of its tendency to form non-metallic inclusions. Laser welding tests of 2-mm-thick sheets were performed using the keyhole-welding mode and a solid-state laser. The tests were carried out in air and with the use of an argon atmosphere. The distribution, type and chemical composition of the non-metallic inclusions formed in the base metal and fusion zones were analysed. The effect of applying the protective gas on the type and amount of non-metallic inclusions was determined using light and scanning electron microscopy. The chemical composition of the identified particles was assessed using the EDS method. It was found that a protective gas has a beneficial effect on reducing the non-metallic inclusions, but only to a limited extent. The boundary between the complex oxides and the pure aluminium oxides was determined to be 2-3 μm. Keywords: TRIP steel, laser welding, non-metallic inclusions, protective gas, Ar atmosphere, oxidation Namen te {tudije je opredeliti varivost s stali{~a tvorbe nekovinskih vklju~kov v ve~faznem jeklu, ki vsebuje Al in Si, za avtomobilsko industrijo. Izvedeni so bili varilni preizkusi z laserjem na 2 mm debelih plo~evinah z V zarezo. Preizkusi so bili izvedeni na zraku in v za{~itni atmosferi argona. Analizirana je bila razporeditev, vrsta in kemijska sestava nekovinskih vklju~kov v osnovnem materialu in v coni zlivanja. Vpliv uporabe za{~itnega plina na vrsto in koli~ino nekovinskih vklju~kov je bil dolo~en s pomo~jo svetlobne in vrsti~ne elektronske mikroskopije. Kemijska sestava najdenih delcev je bila ugotovljena z metodo EDS. Ugotovljeno je bilo, da ima za{~itni plin ugoden vpliv na zmanj{anje nekovinskih vklju~kov le v omejenem obsegu. Meja med kompleksnimi oksidi in~istimi oksidi aluminija je bila dolo~ena kot 2-3 μm.

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Characteristics of Nd:YAG Laser Welded Joints of Dual Phase Steel

Cited by 19 publications

References 8 publications

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Dilatometric study of phase transformations in advanced high-strength bainitic steel

Microstructure and Hardness Profiles of Bifocal Laser-Welded DP-HSLA Steel Overlap Joints

Effect of gas atmosphere on the non-metallic inclusions in laser-welded trip steel with Al and Si additions

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