ISSN -
11th International Rolling Conference (IRC 2019) — vol. 11, num.11 (2019)
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Abstract
The automotive industry’s interest in galvannealed (GA) boron steel for hot forming processes application has been steadily increasing due to its excellent surface quality, galvanic protection provided to the parts, good paint adhesion and better weldability in relation to other coatings for this application. In this study, samples of 22MnB5 galvannealed steel were heat treated and hot stamped on a water cooled die in laboratory scale. Influence of heat treatment on stability of coating and steel was assessed by using heating rates 10.0ºC/s and 15.0ºC/s. Microstructural evolution of galvannealed coating and structural integrity of steel during hot forming were investigated by scanning electron microscopy with energy dispersive spectroscopy analysis (SEM/EDS), glow discharge emission spectroscopy (GDOES) and X-ray diffraction (XRD). It was possible to quantify the Fe-Zn phase evolution during hot forming, to understand the effect of these transformations on the product properties and to establish an optimized heat treatment for hot forming of these steel, achieving greater operational flexibility and final products free from surface defects or cracks in the substrate.
Keywords
GA coating; GALVANNEALED sTEEL, 22MnB5 steel; Hot stamping.
How to refer
Eleutério, Henrique Lacerda;
Barbosa, Aldo Henrique de Almeida;
Buono, Vicente Tadeu Lopes.
INFLUENCE OF HEATING RATE ON MICROSTRUCTURE OF GALVANNEALED COATING DURING HOT STAMPING
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p. 223-231.
In: 11th International Rolling Conference (IRC 2019),
São Paulo,
2019.
ISSN: -
, DOI 10.5151/9785-9785-32242
