Abstract
In this study, the influence of the multi-step heating methods, such as two-step heating methods and three-step heating methods, on the properties of Al–Si coating boron steel sheet were evaluated by using the Gleeble-3500 thermal simulator. The evolution of microstructure and 3D surface topography of the Al–Si coating were also investigated. The results showed that the heating rates of 50 °C/s, named rapid heating, at the stage of 20–500 °C did not significantly influence the microstructure and 3D surface topography of the Al–Si coating in the two-step heating methods. The results also indicated that the volume fractions of Fe3Al2Si3 intermetallic compound, FeAl intermetallic compound and a-Fe phase in the Al–Si coating reduced by rapid heating at the stage of 700–930 °C in the three-step heating methods. The roughness of 3D surface topography of the Al–Si coating increased by rapid heating at the stage of 700–930 °C. Rapid heating at the stage of 700–930 °C had little influence on the porosity of the Al–Si coating. The results provided a theoretical basis for the popularization and application of rapid heating in the Al–Si coating boron steel sheet.
Highlights
Accepted: 26 January 2021With the increasingly serious of energy and environment crisis, energy saving and emission reducing were the future development direction of the automobile industry
The thickness of the Al–Si coating boron steel sheet using in the tests in hot-dipped conditions is 1.8 mm
It is because that at a certain heating temperature, regardless of the ing methods wasifalmost thetemperature same, which that the two-step heating methodshd rates of 10 °C/s microstructure ofindicated the Al–Si coating obtained by thepoint, two-step heating rates,[37], thethe heating was under the phase transition temperature not the microstructure and intermetallic compounds of the ing influence methods was almost the same, which indicated that the two-step methods no new intermetallic compounds would formed
Summary
With the increasingly serious of energy and environment crisis, energy saving and emission reducing were the future development direction of the automobile industry. Fan [31], Cheng [32], Wang [33], Pontevichi [34], Achar [35], and Pelcastre [36] pointed out that the evolution of voids in the Al–Si coating boron steel sheet was related to the diffusion behavior of Fe atoms and Al atoms during the heating process. They found that the evolution of microcracks in the Al–Si coating boron steel sheet was relevant to the difference of the thermal expansion coefficient of the new formed Fex Aly Siz intermetallic compounds. The results of the studies have certain guiding significance for the development of heating process for the Al–Si coating boron steel sheet
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