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A study on the Surface Roughness of Galvannealed Low Carbon Al-Killed and Ti-Nb Stabilized Interstitial Free Steels

Elkoca Sen Candan, Ekmekci Bulent, Elkoca Oktay

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 3

841--857

In this study, the surface roughness of galvannealed low carbon Al-killed and Ti-Nb stabilized interstitial free steels was investigated using the industrial galvannealing process parameters. The iron content of the coatings was also analysed to establish a relationship with the surface roughness and coating composition. The surface roughness displayed an exponential behaviour with increasing of annealing time at each annealing temperature in both steel coatings, which was in an increasing order in the galvannealed low carbon Al-killed steel coating, whereas it was a reverse order in the galvannealed Ti-Nb stabilized interstitial free steel coating. The craters were observed on the galvannealed coatings resulting in high surface roughness. Increasing the iron content of the coatings leads to a reduction in the surface roughness with δ1k phase.

Inverter DC resistance spot weldability of 590 MPa galvannealed steel for automotive applications

Yoon H., Kim D., Kang M.

Archives of Materials Science and Engineering

2011

Vol. 49, nr 2

112-117

Purpose: This study analyzes resistance spot weldability of coated and uncoated DP 590 steels. Design/methodology/approach: To compare the resistance spot weldability of coated (GAFC590, galvannealed) and uncoated (SPFC590) steels, tensile strength test and macro-section test were conducted for the resistance spot welds. Acceptable welding conditions were determined as a function of the resistance spot welding process parameters such as electrode force, welding time, and welding current. The lower limit of the welding lobe was the minimum shear tension strength for 590 MPa-grade steel while the upper limit was determined whether or not expulsion was detected. Findings: Galvannealed steel required more welding current than uncoated steel. Acceptable welding current condition and welding lobe were changed depending on whether steel is coated or not. Research limitations/implications: This study is forced on inverter DC resistance spot weldability of 590Mpa-grade steels for automotive application. Practical implications: This study confirms the weldability of galvannealed steel by comparing resistance spot weldability depending on whether or not the steels is coated. Originality/value: This study analysed resistance spot weldability depending on whether or not steel sheets are coated, where SPFC590 uncoated steel) and GAFC590 (galvannealed steel) were used. The required spot welding current for galvannealed steels was higher than the uncoated steel and welding lobes for coated and uncoated steels were determined.