Galvanizing and Galvannealing Behavior of CMnSiCr Dual-Phase Steels

Lin, Keng‐Pei; Chu, Peng-Wei; Lin, Chao-Sung; Chen, Hon-Bor

doi:10.1007/s11661-013-1612-3

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…7,10,12,24) According to the nucleation mechanism, there are two possible routes to nucleate the ζ phase in the coating. First, the ζ phase can nucleate and grow at the area without or with lower Si contents.…”

Section: Resultsmentioning

confidence: 99%

“…The etching solution followed the recipe of Kilpatrick,13) in which the etching was conducted for approximately 3 s for GI specimens and 6 s for GA specimens. The various Fe-Zn phases are shown up with different colors [12][13][14][15] including the ζ phase in light blue (right beneath the pure Zn), the δ phase in a brown color, the Γ1 in light blue (darker than ζ phase), and the Γ in dark gray. The chemically etched specimen was observed using a Nikon Microphot-FXA optical microscope.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Silicon in Dual Phase Steel on the Alloy Reaction in Continuous Hot-dip Galvanizing and Galvannealing

Lin

2014

ISIJ Int.

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The mechanical properties of steels can be significantly improved by alloying with Si. However, Si in dual phase steel retarded the alloy reaction in hot-dip galvanizing and galvannealing; specifically, a continuous Fe-Zn alloy layer was absent on the steel containing 0.44 wt% Si after 25 s of galvannealing at 500°C. This retardation may be due to the Si-rich molten Zn layer, in which the Si resulted from the aluminothermic reduction of Si oxide and the dissolution from the steel substrate.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of Silicon in Dual Phase Steel on the Alloy Reaction in Continuous Hot-dip Galvanizing and Galvannealing

Lin

2014

ISIJ Int.

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“…The Zn coating applied to AHSS has the capability of providing cathodic protection and creates a metallurgically bonded zinc-iron barrier layer between steel and environment to improve the corrosion resistance [4]. Therefore, hot-dip galvanization is a necessary process for DP steels, despite this process simultaneously deteriorating the strength [5][6][7]. The reduction in strength is attributed to the hot-dip galvanized temperature, which is in the range of bainitic transformation and facilitates the generation of bainite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Chen,

Liang,

Yang

et al. 2023

Crystals

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Generally, the addition of Chromium (Cr) into the dual-phase (DP) steels can suppress bainitic transformation. In this work, the continuous hot-dip galvanization of DP980 steel is thermally simulated with various Cr contents of 0/0.3/0.6 wt.%, and the effect of Cr on bainitic transformation and properties of steels is studied. The results indicate that the bainitic transformation is obviously inhibited. The fraction of bainite decreases with the increasing Cr content. The incubation time is prolonged in the 0.6Cr steel with a slower bainitic transformation rate. Compared to that of 0 and 0.3Cr steels, the 0.6Cr steel exhibits a high tensile strength of 1033 MPa and uniform elongation of 9.1% due to the rapid strain-hardening rate. As a result, the mechanical properties of 0.6Cr steel satisfy the requirements of hot-dip galvanized DP980 steel.

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“…Silicon is the alloying element used for inhibiting cementite precipitation and also provides solid solution strengthening [8,9]. However, high-silicon levels (>0.3 wt-% Si) are not suitable for industrially processed galvanised flat products, because high-silicon content results in the formation of an oxide layer, which is easily formed on the surface during continuous annealing [10,11]. Silicon oxides have low wettability with zinc, resulting in bare spots.…”

Section: Introductionmentioning

confidence: 99%

Microstructure–mechanical property relationship in hot-rolled high-Al-low-Si dual-phase steel

Deng

Misra

2017

Ironmaking & Steelmaking

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In this study, the effect of finish rolling temperature and coiling temperature on the microstructure and mechanical properties of high-Al-low-Si dual-phase (DP) steels is explored. Two different finish rolling temperatures (850 and 790°C) and three different coiling temperatures (200, 250 and 300°C) were studied. The results indicated that all the different processing conditions led to ferritemartensite DP microstructure. With the decrease in finish rolling temperature, the volume fraction of ferrite was increased and martensite content was decreased. When the coiling temperature was increased to 300°C, autotempered martensite was obtained, which led to the softening of martensite and decrease in tensile strength and strain hardening ability, but higher post-necking elongation. Moreover, the nanoscale Nb-based carbides played a crucial role in refining the microstructure of hot-rolled high-Al-low-Si DP steel. EBSD (Electron Backscattered Diffraction) analysis revealed that the ferrite grains were fine, and decrease in finish rolling temperature and coiling temperature led to an increase in low-angle boundaries. When the finish rolling temperature was decreased to 790°C and coiling temperature was decreased to 200°C, the steel had excellent mechanical properties with tensile strength of 885 MPa, uniform and total elongation of 16.0 and 25.94%, respectively, and the product of tensile strength and total elongation was 20 264 MPa%. The improvement of strength and plasticity can be attributed to the fraction of ferrite and martensite, precipitation of NbC, fine microstructure.

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Galvanizing and Galvannealing Behavior of CMnSiCr Dual-Phase Steels

Cited by 15 publications

References 24 publications

Effect of Silicon in Dual Phase Steel on the Alloy Reaction in Continuous Hot-dip Galvanizing and Galvannealing

Effect of Silicon in Dual Phase Steel on the Alloy Reaction in Continuous Hot-dip Galvanizing and Galvannealing

Effect of Chromium on Microstructure and Mechanical Properties of Hot-Dip Galvanized Dual-Phase (DP980) Steel

Microstructure–mechanical property relationship in hot-rolled high-Al-low-Si dual-phase steel

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