Effect of Chromium on Microstructure and Mechanical Properties of Cold Rolled Hot-dip Galvanizing DP450 Steel

Han, Yang‐Kyoo; Kuang, Shuang; Liu, Huasai; Jiang, Yinghua; Guang-hui, Liu

doi:10.1016/s1006-706x(15)30112-6

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…Han et al [9] reported that DP steel with more Cr presents better elongation and a lower yield ratio. Li et al [10] investigated a Cr-bearing low carbon steel treated by a Q&P process.…”

Section: Introductionmentioning

confidence: 99%

Bainitic Transformation and Properties of Low Carbon Carbide-Free Bainitic Steels with Cr Addition

Zhou

Tian

et al. 2017

Metals

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Two low carbon carbide-free bainitic steels (with and without Cr addition) were designed, and each steel was treated by two kinds of heat treatment procedure (austempering and continuous cooling). The effects of Cr addition on bainitic transformation, microstructure, and properties of low carbon bainitic steels were investigated by dilatometry, metallography, X-ray diffraction, and a tensile test. The results show that Cr addition hinders the isothermal bainitic transformation, and this effect is more significant at higher transformation temperatures. In addition, Cr addition increases the tensile strength and elongation simultaneously for austempering treatment at a lower temperature. However, when the austempering temperature is higher, the strength increases and the elongation obviously decreases by Cr addition, resulting in the decrease in the product of tensile strength and elongation. Meanwhile, the austempering temperature should be lower in Cr-added steel than that in Cr-free steel in order to obtain better comprehensive properties. Moreover, for the continuous cooling treatment in the present study, the product of tensile strength and elongation significantly decreases with Cr addition due to more amounts of martensite.

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“…Han et al [9] reported that DP steel with more Cr presents better elongation and a lower yield ratio. Li et al [10] investigated a Cr-bearing low carbon steel treated by a Q&P process.…”

Section: Introductionmentioning

confidence: 99%

Bainitic Transformation and Properties of Low Carbon Carbide-Free Bainitic Steels with Cr Addition

Zhou

Tian

et al. 2017

Metals

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“…Figure 8a displays an optical micrograph of the central position of the flange, etched with LePera etchant solution. It is widely recognized that MA constituents exhibit a bright white appearance in micrographs etched with LePera etchant [10,20,24]. Figure 8b,c present EBSD band contrast and phase identification images.…”

Section: Resultsmentioning

confidence: 97%

Microstructural and Mechanical Characterization of Low-Alloy Fire- and Seismic-Resistant H-Section Steel

Kim,

Yu,

Kim

et al. 2024

Metals

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This study investigates the microstructure and nano-hardness distribution across the thickness of an H-section steel beam, specifically designed for seismic and fire resistance and fabricated using a quenching and self-tempering process. The beam dimensions include a 24 mm thick flange, with flange and web lengths of 300 mm and 700 mm, respectively. Our findings indicate that the mechanical properties across the flange thickness meet the designed criteria, with yield strengths exceeding 420 MPa, tensile strengths of over 520 MPa, and a yield-to-tensile strength ratio below 0.75. Microstructurally, the central part of the flange predominantly consists of granular bainite with a small fraction of martensite–austenite (MA) constituents, while locations closer to the surface show increased acicular ferrite and decreased MA constituents due to faster cooling rates. Furthermore, thermal exposure at 600 °C reveals that while the matrix microstructure remains thermally stable, the MA phase undergoes tempering, leading to a decrease in nano-hardness. These insights underline the significant impact of MA constituents on the elongation properties and stress concentrations, contributing to the overall understanding of the material’s behavior under seismic and fire conditions. The study’s findings are crucial for enhancing the reliability and safety of construction materials in demanding environments.

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“…Even though it has been proven in several studies that this situation can be improved by adding the alloy Mo, the high cost is an unavoidable disadvantage [15][16][17]. According to previous studies, Cr has a similar effect to Mo, but the cost is significantly lower than Mo [18][19][20]. This suggests that the alloy element of Cr added to DP steel is a candidate for inhibiting the bainitic transformation during the galvanization process and avoiding strength deterioration.…”

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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Effect of Chromium on Microstructure and Mechanical Properties of Cold Rolled Hot-dip Galvanizing DP450 Steel

Cited by 7 publications

References 13 publications

Bainitic Transformation and Properties of Low Carbon Carbide-Free Bainitic Steels with Cr Addition

Bainitic Transformation and Properties of Low Carbon Carbide-Free Bainitic Steels with Cr Addition

Microstructural and Mechanical Characterization of Low-Alloy Fire- and Seismic-Resistant H-Section Steel

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

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