On the Selective Oxidation of a 0.15C-6Mn-2Al-1Si Third-Generation Advanced High Strength Steel During Two-Stage Annealing Treatments

Pallisco, Daniella M.; McDermid, Joseph R.

doi:10.1007/s11661-023-06985-2

Cited by 3 publications

(6 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, an additional mechanism for Zn ingress into the substrate is proposed whereby the reactive wetting was facilitated by the selective dissolution of MnO, MnSiO 3 , and Mn 2 SiO 4 during flash pickling. Previous work by the present authors [ 51,52 ] showed that the flash pickling used to restore the substrate surfaces also dissolved some of the internal oxide structures directly connected to the surface. These partially dissolved structures were preserved during the intercritical annealing step and could allow for bath metal infiltration and mechanical interlocking of the coating with the substrate.…”

Section: Discussionmentioning

confidence: 72%

“…SEM images of the preimmersion surfaces (Figure 2 and 3) show discrete and dispersed nanoscaled oxides that were previously identified as MnCr 2 O 4 [51] and MnAl 2 O 4 [52] for steels A and B, respectively. The surfaces were also covered with extruded Fe The patterns were indexed using the PDF-4 database.…”

Section: Discussionmentioning

confidence: 81%

“…SEM images of the preimmersion surfaces (Figure 2 and 3) show discrete and dispersed nanoscaled oxides that were previously identified as MnCr 2 O 4 [ 51 ] and MnAl 2 O 4 [ 52 ] for steels A and B, respectively. The surfaces were also covered with extruded Fe nodules, which provided additional oxide‐free Fe surfaces to react with the galvanizing bath metal to form the desired Fe 2 Al 5– x Zn x interfacial layer, as shown in Figure 10.…”

Section: Discussionmentioning

confidence: 93%

“…[51] In the case of steel B, the external oxide nodules were approximately 50 nm thick and largely comprised MnAl 2 O 4 . [52] The extruded Fe nodules were a result of the volumetric expansion associated with internal oxidation during the 600 s austenitizing pretreatment. [38,[57][58][59] The spatial distribution of the MnSiO 3 /Mn 2 SiO 4 oxides prior to flash pickling affected the distribution of the remaining oxides after flash pickling.…”

Section: Preimmersion Substrate Surface Characterizationmentioning

confidence: 99%

“…The chemical speciation and morphology of the internal and external oxides formed during these annealing cycles have also been previously documented by the present authors. [51,52]…”

mentioning

confidence: 99%

See 4 more Smart Citations

Continuous Hot‐Dip Galvanizing of Medium‐Manganese Third‐Generation Advanced High‐Strength Steels

Bhadhon

Pallisco

McDermid

2023

steel research int.

Self Cite

View full text Add to dashboard Cite

The effects of process atmosphere oxygen partial pressure (pO2) on the preimmersion surface structures, interfacial reactive wetting products, and reactive wetting mechanisms of two prototype (0.15–0.20)C–(5.6–5.9)Mn–(0.4–1.9)Al–(1.1–1.5)Si–(0–0.6)Cr (wt%) third‐generation advanced high‐strength steels during continuous hot‐dip galvanizing are determined. In this study, the two‐stage thermal processing routes employed comprise an austenitization anneal followed by flash pickling and an intercritical anneal. All annealing treatments are conducted in a N2–5 vol% H2 process atmosphere with a controlled dew point. The substrates are austenitized at dew points of –30 or –10 °C, intercritically annealed at a dew point of –30, –10, or +5 °C, and then galvanized using a conventional 0.2 wt% Al (dissolved) bath. The preimmersion surfaces comprise a near‐pure Fe layer with dispersed nanoscaled oxide nodules. The primary reactive wetting mechanism is the direct wetting of the surface Fe, while oxide wetting, oxide cracking and liftoff, and oxide bridging by the liquid metal bath are secondary reactive wetting mechanisms. Zn ingress into the substrate via pores in the oxide network from selective dissolution during flash pickling is also noted. A well‐developed Fe2Al5–xZnx interfacial layer is observed for all metallic coating conditions. The resultant coatings show outstanding adherence after ASTM three‐point bend testing.

show abstract

Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 81%

“…SEM images of the preimmersion surfaces (Figure 2 and 3) show discrete and dispersed nanoscaled oxides that were previously identified as MnCr 2 O 4 [ 51 ] and MnAl 2 O 4 [ 52 ] for steels A and B, respectively. The surfaces were also covered with extruded Fe nodules, which provided additional oxide‐free Fe surfaces to react with the galvanizing bath metal to form the desired Fe 2 Al 5– x Zn x interfacial layer, as shown in Figure 10.…”

Section: Discussionmentioning

confidence: 93%

Section: Preimmersion Substrate Surface Characterizationmentioning

confidence: 99%

“…The chemical speciation and morphology of the internal and external oxides formed during these annealing cycles have also been previously documented by the present authors. [51,52]…”

mentioning

confidence: 99%

See 3 more Smart Citations

Continuous Hot‐Dip Galvanizing of Medium‐Manganese Third‐Generation Advanced High‐Strength Steels

Bhadhon

Pallisco

McDermid

2023

steel research int.

Self Cite

View full text Add to dashboard Cite

show abstract

High temperature oxidation behavior and microstructure evolution of medium Mn steel

Zhang,

Liu,

et al. 2024

Surfaces and Interfaces

View full text Add to dashboard Cite

High-temperature oxidation behavior and subsurface phase transformation of high-Mn high-Al steel

Wang,

Li,

Zhang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

View full text Add to dashboard Cite

High-Mn steels are widely used in engineering applications because of their high strength, high hardness, and excellent toughness. In the industrial production of high-Mn steel, the steel is easy to be oxidized during the homogenization process, which may affect the properties of high-Mn steel. In this work, high-Mn high-Al steel with composition of (25–32)wt-%Mn-(8–11)wt-%Al-1wt-%C-Fe was prepared, the oxidation behavior and subsurface phase transformation of steel at 800 °C–1200 °C were investigated by thermogravimetric analysis, scanning electron microscope and X-ray diffraction. The results show that the curve of oxidation weight gain with time is in good agreement with linear equations below 900 °C, which obey the parabolic rate law in the temperature range of 1000 °C–1200 °C. The steel matrix would be covered by the oxide scale earlier at higher temperatures, which decreases the oxidation reaction rate and makes the turning point of the oxidation reaction rate reach faster at higher temperatures. The Mn-depleted zone resulting from the selective oxidation of Mn is formed in the steel matrix epidermis, leading to the subsurface phase transformation, which may deteriorate the steel properties.

show abstract

On the Selective Oxidation of a 0.15C-6Mn-2Al-1Si Third-Generation Advanced High Strength Steel During Two-Stage Annealing Treatments

Cited by 3 publications

References 57 publications

Continuous Hot‐Dip Galvanizing of Medium‐Manganese Third‐Generation Advanced High‐Strength Steels

Continuous Hot‐Dip Galvanizing of Medium‐Manganese Third‐Generation Advanced High‐Strength Steels

High temperature oxidation behavior and microstructure evolution of medium Mn steel

High-temperature oxidation behavior and subsurface phase transformation of high-Mn high-Al steel

Contact Info

Product

Resources

About