Prediction of prior austenite grain growth in the heat-affected zone of a martensitic steel during welding

Shi, Lei; Alexandratos, Spyridon A.; O’Dowd, Noel P.

doi:10.1016/j.ijpvp.2018.08.005

Cited by 8 publications

(3 citation statements)

References 52 publications

(92 reference statements)

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“…The martensitic structure in the area of the bonding line has a PAG size of 34

. The grain size formed is related to the maximum austenitisation temperature and the holding time [ 24 ]. The maximum temperatures reached during welding decrease with increasing distance from the bonding line due to the skin and proximity effect [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of Temperature and Contact Pressure Influence on HFI Welded Joint Properties

et al. 2022

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This paper presents an experimental electro-thermo-mechanical simulation of high-frequency induction (HFI) welding to investigate the effect of temperature and contact normal stress on the weld seam quality. Therefore welding experiments at different temperatures and contact pressures are performed using flat specimens of 34MnB5 steel sheet. In order to characterize the weld seam strength of the welded specimens, tensile and bending tests are performed. To obtain a relative weld seam strength, the bending specimens were additionally hardened prior to testing. With the hardened specimens, it can be shown that the weld seam strength increases with increasing temperature and contact normal stress until a kind of plateau is formed where the weld seam strength remains almost constant. In addition to mechanical testing, the influence of the investigated process parameters on the weld seam microstructure is studied metallographically using light optical microscopy, scanning electron microscopy, EBSD and hardness measurements. It is shown that the weld seam strength is related to the amount of oxides in the bonding line.

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“…The martensitic structure in the area of the bonding line has a PAG size of 34

Section: Resultsmentioning

confidence: 99%

Experimental Investigation of Temperature and Contact Pressure Influence on HFI Welded Joint Properties

et al. 2022

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“…However, during welding, the material faces thermal cycles that lead to significant microstructural changes in the heat affected zone (HAZ) 11 . Shi et al 12 observed that these changes might cause degradation and premature failure of the welded parts, with crack nucleation in the HAZ region. Lu et al 13 reported that boron steels in the hot-stamped condition undergo severe softening due to martensitic tempering that takes place in the HAZ sub-region known as subcritical heat affected zone (SCHAZ) during RSW.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of a Hot-Stamped Boron Steel Automotive Part and Its Influence on Corrosion Properties and Tempering Behavior

et al. 2023

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Boron-manganese steel 22MnB5 is extensively used in structural automotive components. Knowledge about its microstructural evolution during hot stamping and resistance spot welding (RSW) is extremely relevant to guarantee compliance with application requirements. Particularly, corrosion properties are critical to the application of uncoated sheet steels. However, microstructural studies are usually simplified to top-hat geometries, which might not be fully representative of the complex thermomechanical cycles locally faced by a real component. Therefore, the present work brings an extensive characterization of a hot-stamped 22MnB5 automotive B-pillar in terms of microstructure, hardness and corrosion resistance, which were correlated with a reverse engineering of the process using numerical simulation. Physical simulations of the subcritical heat affected zone (SCHAZ) of RSW were done to assess the influence of microstructure on martensite tempering. Results showed that the component undergoes a complex strain distribution along its body during hot stamping. Most heavily strained regions presented higher amounts of ferrite, leading to poorer corrosion resistance, since ferrite behaves as an anode. Physical simulations of the SCHAZ showed that the softening degree due to martensite tempering is solely affected by peak temperature, while other microstructural features appear to exert negligible or no influence.

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“…However, the rapid heating and cooling process involved in welding causes the phase to transition from austenite to delta ferrite as reported in past work [21,23]. Additionally, arc welding, the most common form of welding, causes grain coarsening [24,25] and sensitization [26,27] by precipitating chromium carbides along the grain boundaries at heat affected zones (HAZ). Chromium carbide precipitation leads to chromium depletion, which ultimately reduces the corrosion resistance of the SS.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Corrosion Resistance of Stainless Steel Welded Joint Using a Nanostructured Oxide Layer

Heo

Lee

et al. 2021

Nanomaterials

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In this study, we fabricated a nanoporous oxide layer by anodization to improve corrosion resistance of type 304 stainless steel (SS) gas tungsten arc weld (GTAW). Subsequent heat treatment was performed to eliminate any existing fluorine in the nanoporous oxide layer. Uniform structures and compositions were analyzed with field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD) measurements. The corrosion resistance of the treated SS was evaluated by applying a potentiodynamic polarization (PDP) technique and electrochemical impedance spectroscopy (EIS). Surface morphologies of welded SS with and without treatment were examined to compare their corrosion behaviors. All results indicate that corrosion resistance was enhanced, making the treatment process highly promising.

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Prediction of prior austenite grain growth in the heat-affected zone of a martensitic steel during welding

Cited by 8 publications

References 52 publications

Experimental Investigation of Temperature and Contact Pressure Influence on HFI Welded Joint Properties

Experimental Investigation of Temperature and Contact Pressure Influence on HFI Welded Joint Properties

Microstructural Evolution of a Hot-Stamped Boron Steel Automotive Part and Its Influence on Corrosion Properties and Tempering Behavior

Improvement of Corrosion Resistance of Stainless Steel Welded Joint Using a Nanostructured Oxide Layer

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