Microstructural characteristics and mechanical properties of the Al–Si coating on press hardened 22MnB5 steel

Cho, Lawrence; Golem, Lindsay; Seo, Eun Jung; Bhattacharya, Diptak; Speer, John G.; Findley, Kip O.

doi:10.1016/j.jallcom.2020.156349

Cited by 36 publications

(21 citation statements)

References 44 publications

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“…[ 32 ] after austenitization at 1050 °C, deformation and cooling. Furthermore, the gradual transition from the bcc crystal structure of α-Fe to D0 3 of Fe 3 Al and to B2 of FeAl at the substrate/coating interface was reported by Cho et al [ 24 ]. However, the authors did not observe any evidence of interfaces between these three different crystal structures.…”

Section: Resultsmentioning

confidence: 75%

“…[ 6 , 17 ]. Cho et al [ 24 ] noted that the island-like phase, in addition to the FeAl phase, was formed by an adjacent Fe x Al y Si z ternary phase that was not identified due to its fine nature and probably low symmetry.…”

Section: Resultsmentioning

confidence: 99%

“…The very fine nature of the Fe 3 Al rod-shaped particles can be clarified with a closer look at the Fe-Al phase diagram ( Figure 6 ). The Fe 3 Al phase is stable in a concentration range from 22.5 at.% to 36.5 at.% Al and transformed to FeAl or α-Fe at temperatures above 545 °C [ 24 ]. Considering that the typical temperature is 800–850 °C at the beginning of hot stamping and the die-quenching in the tool is maintained usually for 8–12 s [ 37 ], there is not enough time for transformation and phase growth, resulting in the very fine nature of the rod-shaped Fe 3 Al particles.…”

Section: Resultsmentioning

confidence: 99%

“…[ 5 , 22 , 23 ], with an interdiffusion layer formed of Fe 3 Al [ 5 , 23 ]. The most recent work from Cho et al [ 24 ] stated that the three-phase interdiffusion layer consisted of α-Fe(Al), Fe 3 Al, FeAl, the matrix of Fe 2 Al 5 , and a continuous layer or island-like phase distributed in the matrix as a mixture of FeAl and an unidentified Fe x Al x Si z ternary phase.…”

Section: Introductionmentioning

confidence: 99%

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Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

et al. 2021

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The chemical and phase composition of the coating and the coating/substrate interface of an Al-Si-coated 22MnB5 hot stamped steel was investigated by means of SEM-EDS, XRD, micro-XRD and electron diffraction. Moreover, the surface profile was analyzed by XPS and roughness measurements. The XPS measurements showed that the thickness of the Si and Al oxide layers increased from 14 to 76 nm after die-quenching, and that the surface roughness increased as well as a result of volume changes caused by phase transformations. In addition to the FeAl(Si) and Fe2Al5 phases and the interdiffusion layer forming complex structures in the coating, electron diffraction confirmed the presence of an Fe2Al5 phase, and also revealed very thin layers of Fe3(Al,Si)C, Fe2(Al,Si)5 and Al-bearing rod-shaped particles in the immediate vicinity of the steel interface. Moreover, the scattered nonuniform layer of the Fe2Al8Si phase was identified in the outermost layer of the coating. Despite numerous studies devoted to researching the phase composition of the Al-Si coating applied to hot stamped steel, electron diffraction revealed very thin layers and particles on the coating/substrate interface and outermost layer, which have not been analyzed in detail.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

et al. 2021

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“…A significant change in the anodic/cathodic coupling of the coating/steel due to iron enrichment in the coating layer was observed. Other studies assess the effect of the applied coating on steel corrosion [ 33 , 34 ]. Allely et al [ 35 ] tested anticorrosion mechanisms of aluminized steel for hot stamping.…”

Section: Introductionmentioning

confidence: 99%

Tribocorrosion and Abrasive Wear Test of 22MnCrB5 Hot-Formed Steel

et al. 2022

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The article presents the results of research on abrasive and tribocorrosion wear of boron steel. This type of steel is used in the automotive and agricultural industries for the production of tools working in soil. The main goal of the article is the evaluation of tribocorrosion and abrasive wear for hot-formed 22MnCrB5 steel and a comparison of the obtained results with test results for steel in a cold-formed state. The spinning bowl method to determine the wear of samples working in the abrasive mass was used. Furthermore, a stand developed based on the ball-on-plate system allows to determine the wear during the interaction of friction and corrosion. After the hot-forming process, 22MnCrB5 steel was three times more resistant for the abrasive wear than steel without this treatment. The average wear intensity for 22MnCrB5 untreated steel was 0.00046 g per km, while for 22MnCrB5 hot-formed steel it was 0.00014 g per km. The tribocorrosion tests show that the wear trace of hot-formed 22MnCrB5 steel was about 7.03 µm, and for cold-formed 22MnCrB5 steel a 12.11 µm trace was noticed. The hot-forming method allows to obtain the desired shape of the machine element and improves the anti-wear and anti-corrosion properties for boron steel.

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Laser welding of tailored blanks made of Al-Si-coated 22MnB5 steel using a filler wire and a variable energy distribution laser optics

Coviello

Heydt²,

Rullo³

et al. 2023

Int J Adv Manuf Technol

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Laser welding of Al-Si-coated steels for hot stamping in automotive applications is problematic due to the mixing of the coating layers inside the molten pool that weakens the resulting weld seam. In this case, the most common welding procedure to overcome this issue consists in removing the Al-Si layer through laser ablation prior to the joining. This method continues to be the most widely used by major producers of tailor welded blanks, although in situ ablation of the Al-Si coating can be costly and time consuming. In this work, a novel approach consisting in joining as-received (i.e., not decoated) materials using a filler wire and an innovative variable energy distribution laser optics is introduced and tested on tailor welded blanks made of 22MnB5. Tensile tests of specimens obtained from a 33 full factorial design of experiment have shown an average value of ultimate tensile strength of 1523 MPa, which is much higher than the one usually observed in as-received welded then hot-stamped conditions and aligned with hot-stamped base material values. Hardness test results (494–543 HV0.5) were in the typical hot-stamped base material range of values as well, while SEM–EDS analyses detected no ferrite inclusions inside the fusion zone. Variations of the main process parameters have been considered on an iso-thickness and iso-material configuration, empirically demonstrating the stability and reliability of the proposed methodology as well as its suitability for production purposes.

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Microstructural characteristics and mechanical properties of the Al–Si coating on press hardened 22MnB5 steel

Cited by 36 publications

References 44 publications

Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

Tribocorrosion and Abrasive Wear Test of 22MnCrB5 Hot-Formed Steel

Laser welding of tailored blanks made of Al-Si-coated 22MnB5 steel using a filler wire and a variable energy distribution laser optics

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