In the last years, press-hardened steel (PHS) plates have been used to manufacture lightweight car body parts widely to meet the increasingly stringent regulations for reducing fuel consumption and greenhouse gas emissions while promoting passenger safety. Using electronic universal testing machines, metallographic microscope, scanning electron microscope (SEM) and corrosion test chamber, the mechanical and corrosion performances were investigated between AlSi75 and AlSi30 samples. Results show that the coating transforms from a two-layer structure into a five-layer structure, and the microstructure transforms from ferrite, carbides and pearlite into martensite and retained austenite after hot press forming; the tensile properties, hardness and bending angle for both PHS samples are basically the same, but the maximum bending force of the AlSi30 samples are 16% larger than that of AlSi75; After neutral salt spray (NSS) tests, the AlSi75 samples exhibit more excellent corrosion resistance than AlSi30 samples. And the corrosion depth of AlSi75 and AlSi30 samples exceeds 38 μm and 159 μm, respectively; the α-Fe layer for both PHS samples is left to protect the substrate from further corrosion after vehicle cyclic corrosion (VCC) tests. But the AlSi75 samples also show better corrosion resistance. The corrosion widths of AlSi75 and AlSi30 samples are 2.51 mm and 3.83 mm, respectively.
Comparison of Mechanical and Corrosion Performances of AlSi-Coated PHS Plates with Different Coating Thickness
Lect. Notes Electrical Eng.
Society of Automotive Engineers (SAE)-China Congress ; 2022 ; Shanghai, China November 22, 2022 - November 24, 2022
2023-04-29
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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