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THE HARDNESS ANALYSIS OF THE IF SHEET STEEL AFTER A PLASTIC DEFORMATION Mihaliková Mária – Ambriško Ľubomír – Pešek Ladislav Mihaliková Mária – Ambriško.

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Presentation on theme: "THE HARDNESS ANALYSIS OF THE IF SHEET STEEL AFTER A PLASTIC DEFORMATION Mihaliková Mária – Ambriško Ľubomír – Pešek Ladislav Mihaliková Mária – Ambriško."— Presentation transcript:

1 THE HARDNESS ANALYSIS OF THE IF SHEET STEEL AFTER A PLASTIC DEFORMATION Mihaliková Mária – Ambriško Ľubomír – Pešek Ladislav Mihaliková Mária – Ambriško Ľubomír – Pešek Ladislav Department of Materials Science, Faculty of Metallurgy, Technical University of Košice, Slovak Republic Telč 2009

2 Introduction Behaviour of IF steel has been observed in this contribution. Steels were loaded by static tension by the loading rate 1.3 mm/min. Behaviour of IF steel has been observed in this contribution. Steels were loaded by static tension by the loading rate 1.3 mm/min. Videoextensometry method has been used for scanning of the distribution of deformation nearly before fracture. Videoextensometry method has been used for scanning of the distribution of deformation nearly before fracture.

3 Experimental material For tensile tests were applied specimens from IF cold rolled steel sheets. IF (interstitial free) steel, with thickness 1.8 mm. Microstructure Steel Mechanical properties R p 0.2 [MPa] R m [MPa] A 5 [%] IF

4 Experimental methods CCD camera Computer Specimen Light

5 Principe of UCI V-Vickers diamond R-Resonant rod F-Fixing T-Transmitting

6 Relation between HV1 and y of steel IF

7 Conclusions Using the videoextensometry and hardness HV1 test enables to characterize the relation between the plastics deformation y and hardness. The power relation between the hardness HV1 and longitudal deformation was applied. UCI is practical, portable method appropriate to satisfactory determination of deformation state of materials.

8 Thank you for your attention This study was supported by the Grant Agency of Slovak Republic; grant project VEGA No. 1/4149/07 and APVV No


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