Abstract
Analysis of the deep drawing and fatigue properties is given in this contribution for two advanced micro alloyed sheet steel grades with Yield strength values Re 246 and 382 MPa, respectively. The 2 mm thick steel sheets were hot dip zinc coated. The deep drawing properties were evaluated by tensile testing and by the Erichsen test at different strain rates. For fatigue testing the symmetric bending test was applied. Results showed favorable deep drawing properties of these steel sheets assigned for heavy duty parts in automotive industry. Steel grade with Re 246 MPa had elongation A80 32%, n 0.21, Erichsen number IE 12.5 mm and the steel with Re 382 MPa had A80 24 %, n 0.17 and IE 12.4 mm. The tested values showed some growth in dependence on the strain rate up to the press tool velocity about 0.1 m.s1 and at higher strain rates they decreased. The fatigue limit in bending was about 0.6.Re . The zinc coating on the sheet surface remains complete up to the final fracture of the test piece.
Highlights
Zinc coated deep-drawing sheet is marketable in many industrial applications including first of all automotive industry
Erichsen deep drawing test results showed that the indentation depth up to the fracture of the indented cup (IE) is the same for both steel grades used, though they have large differences in elongation A80
As it can be seen, for the increase of the press tool velocity up to about v ϭ 0.2 m.sϪ1 there is a slight growth of the IE, there is a slight decrease of the IE value
Summary
Zinc coated deep-drawing sheet is marketable in many industrial applications including first of all automotive industry. Micro alloyed steel sheet has finer grain than usual steel sheet and that is why the criteria for plastic formability of the sheet are to be modified In this contribution the deep-drawing and fatigue properties of selected zinc coated steel sheet are analyzed. Cyclic loading is frequently the main factor of surface damage and, on the other hand, surface damages can decrease fatigue properties significantly The aim of this contribution is the analysis of plasticity for selected deep drawing zinc coated micro alloyed steel sheet and the evaluation of the influence of strain rate on the analyzed properties, as well as to determine the fatigue properties and to monitor the behavior of the zinc layer during forming and fatigue life
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