Title

FLOW-STRESS BEHAVIOR AND CONSTITUTIVE MODELING OF A HOT ROLLED NB-TI STEEL

FLOW-STRESS BEHAVIOR AND CONSTITUTIVE MODELING OF A HOT ROLLED NB-TI STEEL

Authorship

SANTIAGO, GABRIEL AUGUSTO DE AVILA; LEITE, DUÍLIO NORBERTO FERRONATTO; MOREIRA, LUCIANO PESSANHA; VENTURA, HARISON DA SILVA; SILVA, MELINA GAMIS DA; SOARES, JULLY RAMOS; MUDESTO, BRUNO FERNANDES

SANTIAGO, GABRIEL AUGUSTO DE AVILA

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LEITE, DUÍLIO NORBERTO FERRONATTO

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MOREIRA, LUCIANO PESSANHA

I am this author

VENTURA, HARISON DA SILVA

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SILVA, MELINA GAMIS DA

I am this author

SOARES, JULLY RAMOS

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MUDESTO, BRUNO FERNANDES

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DOI

10.5151/2594-5297-40844

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Abstract

THE PRESENT WORK ANALYZED THE HOT BEHAVIOR OF AN NB-TI MICRO-ALLOYED STEEL USING PHYSICAL SIMULATION AND CONSTITUTIVE MODELING. PLANE-STRAIN COMPRESSION TESTS WERE PERFORMED IN THE GLEEBLE 3500 THERMOMECHANICAL SYSTEM UNDER SEVERAL DEFORMATION TEMPERATURES (950-1150 OC) AND NOMINAL STRAIN RATES (0.01-10 S-1). THE FLOW-STRESS CURVES EXHIBITED TYPICAL DYNAMIC RECRYSTALLIZATION EFFECTS UNDER HIGHER DEFORMATION TEMPERATURES (> 1050 OC, 0.1-1 S-1 AND AT 1150 OC, 10 S-1) AND AT THE LOWEST STRAIN-RATE (> 1050 OC, 0.01 S-1) AND DYNAMIC RECOVERY AT LOWER DEFORMATION TEMPERATURES (950 AND 1000 OC). THE RESULTING EXPERIMENTAL DATA ALLOWED US TO CALCULATE THE AVERAGE THERMAL ACTIVATION ENERGY FOR HOT DEFORMATION AS 387.4 KJ/MOL. MOREOVER, THE MATERIAL PARAMETERS OF THE HYPERBOLIC SINE LAW CONSTITUTIVE EQUATION WERE DETERMINED, ALLOWING US TO PREDICT THE EXPERIMENTAL PEAK STRESS WITH A GOOD MEASURE OF THE CORRELATION COEFFICIENT (0.987) AND A LOW AVERAGE ABSOLUTE RELATIVE ERROR (2.6%).

THE PRESENT WORK ANALYZED THE HOT BEHAVIOR OF AN NB-TI MICRO-ALLOYED STEEL USING PHYSICAL SIMULATION AND CONSTITUTIVE MODELING. PLANE-STRAIN COMPRESSION TESTS WERE PERFORMED IN THE GLEEBLE 3500 THERMOMECHANICAL SYSTEM UNDER SEVERAL DEFORMATION TEMPERATURES (950-1150 OC) AND NOMINAL STRAIN RATES (0.01-10 S-1). THE FLOW-STRESS CURVES EXHIBITED TYPICAL DYNAMIC RECRYSTALLIZATION EFFECTS UNDER HIGHER DEFORMATION TEMPERATURES (> 1050 OC, 0.1-1 S-1 AND AT 1150 OC, 10 S-1) AND AT THE LOWEST STRAIN-RATE (> 1050 OC, 0.01 S-1) AND DYNAMIC RECOVERY AT LOWER DEFORMATION TEMPERATURES (950 AND 1000 OC). THE RESULTING EXPERIMENTAL DATA ALLOWED US TO CALCULATE THE AVERAGE THERMAL ACTIVATION ENERGY FOR HOT DEFORMATION AS 387.4 KJ/MOL. MOREOVER, THE MATERIAL PARAMETERS OF THE HYPERBOLIC SINE LAW CONSTITUTIVE EQUATION WERE DETERMINED, ALLOWING US TO PREDICT THE EXPERIMENTAL PEAK STRESS WITH A GOOD MEASURE OF THE CORRELATION COEFFICIENT (0.987) AND A LOW AVERAGE ABSOLUTE RELATIVE ERROR (2.6%).

Keywords

Nb-Ti micro-alloyed steel; Physical simulation; Constitutive modeling; Hot rolling.

Nb-Ti micro-alloyed steel; Physical simulation; Constitutive modeling; Hot rolling.