Title

MICROSTRUCTURAL CHARACTERIZATION OF AN ULTRA-HIGH STRENGTH HOT-ROLLED STEEL PRODUCED WITH TWO DISTINCT ROLLING STRATEGIES

MICROSTRUCTURAL CHARACTERIZATION OF AN ULTRA-HIGH STRENGTH HOT-ROLLED STEEL PRODUCED WITH TWO DISTINCT ROLLING STRATEGIES

Authorship

PORTO, RICARDO; OLIVEIRA, BÁRBARA F.; FERNANDES, JOELMA K. B.K.; MURAD, BRUNO B.S.; FERREIRA, JETSON L.; CRUZ, LUCIANA XAVIER DA; GUERRA, GLADISTONE S.; MARTINS, CHARLES A.; GODEFROID, LEONARDO B.

PORTO, RICARDO

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OLIVEIRA, BÁRBARA F.

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FERNANDES, JOELMA K. B.K.

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MURAD, BRUNO B.S.

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FERREIRA, JETSON L.

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CRUZ, LUCIANA XAVIER DA

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GUERRA, GLADISTONE S.

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MARTINS, CHARLES A.

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GODEFROID, LEONARDO B.

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DOI

10.5151/2594-5297-41108

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Abstract

CURRENTLY, TWO ROLLING STRATEGIES ARE USED TO PRODUCE THE S700 IN THE HOT STRIP MILL. THE FIRST ONE IS TO TARGET PRECIPITATION HARDENING AND THE SECOND ONE, TO FOCUS ON STRAIN HARDENING FOLLOWED BY ACCELERATED COOLING. IN THIS PAPER, A DETAILED CHARACTERIZATION WAS CARRIED OUT USING TENSILE AND CHARPY TESTS, AS WELL AS METALLOGRAPHIC ANALYSIS BY OPTICAL MICROSCOPY, SCAN, SCAN-EBSD, AUTOMATED STEEL CLEANLINESS TOOL (ASCAT) AND TEM ON HOT-ROLLED COILS PRODUCED USING THESE TWO ROLLING STRATEGIES. FOR THE STRAIN HARDENING STRATEGY, ACCELERATED COOLING WAS DEPLOYED MINIMIZING THE IMPACT OF PRECIPITATION ON THE HSM RUNOUT TABLE. THE RESULTS SUGGEST ADVANTAGES IN THE STRATEGY OF STRAIN HARDENING FOLLOWED BY DELAYED ACCELERATED COOLING

CURRENTLY, TWO ROLLING STRATEGIES ARE USED TO PRODUCE THE S700 IN THE HOT STRIP MILL. THE FIRST ONE IS TO TARGET PRECIPITATION HARDENING AND THE SECOND ONE, TO FOCUS ON STRAIN HARDENING FOLLOWED BY ACCELERATED COOLING. IN THIS PAPER, A DETAILED CHARACTERIZATION WAS CARRIED OUT USING TENSILE AND CHARPY TESTS, AS WELL AS METALLOGRAPHIC ANALYSIS BY OPTICAL MICROSCOPY, SCAN, SCAN-EBSD, AUTOMATED STEEL CLEANLINESS TOOL (ASCAT) AND TEM ON HOT-ROLLED COILS PRODUCED USING THESE TWO ROLLING STRATEGIES. FOR THE STRAIN HARDENING STRATEGY, ACCELERATED COOLING WAS DEPLOYED MINIMIZING THE IMPACT OF PRECIPITATION ON THE HSM RUNOUT TABLE. THE RESULTS SUGGEST ADVANTAGES IN THE STRATEGY OF STRAIN HARDENING FOLLOWED BY DELAYED ACCELERATED COOLING

Keywords

UHSS, S700, EBSD, TEM, Inclusion analysis, Microstructure

UHSS, S700, EBSD, TEM, Inclusion analysis, Microstructure.