Title

EVALUATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SAE 4130 STEEL FROM DIFFERENT ANNEALING ROUTES

EVALUATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SAE 4130 STEEL FROM DIFFERENT ANNEALING ROUTES

Authorship

CARDOSO, GABRIELA DESLANDES; LIMA, LARA FERNANDES ROCHA BARBOSA; SPINDOLA, MIRELLE OLIVEIRA; SANTOS, LEANDRO DE ARRUDA

CARDOSO, GABRIELA DESLANDES

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LIMA, LARA FERNANDES ROCHA BARBOSA

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SPINDOLA, MIRELLE OLIVEIRA

I am this author

SANTOS, LEANDRO DE ARRUDA

I am this author

DOI

10.5151/2594-5297-41000

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Abstract

ANNEALING HEAT TREATMENT IS USUAL AFTER COLD DRAWN PROCESS OF SAE 4130 STEEL, CONSIDERING THE REQUIREMENT TO OBTAIN FERRITE AND PEARLITE MICROSTRUCTURE AND HIGHER DUCTILITY. THIS WORK EVALUATED THE EFFECTS OF FULL ANNEALING AND INTERCRITICAL ANNEALING HEAT TREATMENTS AFTER THE COLD DRAWN PROCESS. MECHANICAL PROPERTIES AND THE FINAL MICROSTRUCTURE OBTAINED IN BOTH ROUTES WERE EVALUATED. IT WAS OBSERVED THAT THE FULL ANNEALING ROUTE PRESENTED FERRITE AND LAMELLAR PEARLITE, WHEREAS THE INTERCRITICAL ANNEALING ROUTE PRESENTED FERRITE AND DEGENERATED PEARLITE. THE DIFFERENCE IN MICROSTRUCTURE AFFECTED THE MECHANICAL PROPERTIES, AS OBSERVED IN YIELD STRENGTH, HARDNESS AND ELONGATION. ALTHOUGH THE YIELD STRENGTH DID NOT PRESENT SIGNIFICANT DIFFERENCES FOR BOTH ROUTES, THE FULL ANNEALING ROUTE SHOWED HIGHER TENSILE STRENGTH AND HARDNESS THAN THE ONE FOUND IN INTERCRITICAL ANNEALING ROUTE. CONSIDERING THE INCREASE IN DUCTILITY AS THE MAIN OBJECTIVE, THE INTERCRITICAL ANNEALING PROVED TO BE MORE EFFICIENT.

ANNEALING HEAT TREATMENT IS USUAL AFTER COLD DRAWN PROCESS OF SAE 4130 STEEL, CONSIDERING THE REQUIREMENT TO OBTAIN FERRITE AND PEARLITE MICROSTRUCTURE AND HIGHER DUCTILITY. THIS WORK EVALUATED THE EFFECTS OF FULL ANNEALING AND INTERCRITICAL ANNEALING HEAT TREATMENTS AFTER THE COLD DRAWN PROCESS. MECHANICAL PROPERTIES AND THE FINAL MICROSTRUCTURE OBTAINED IN BOTH ROUTES WERE EVALUATED. IT WAS OBSERVED THAT THE FULL ANNEALING ROUTE PRESENTED FERRITE AND LAMELLAR PEARLITE, WHEREAS THE INTERCRITICAL ANNEALING ROUTE PRESENTED FERRITE AND DEGENERATED PEARLITE. THE DIFFERENCE IN MICROSTRUCTURE AFFECTED THE MECHANICAL PROPERTIES, AS OBSERVED IN YIELD STRENGTH, HARDNESS AND ELONGATION. ALTHOUGH THE YIELD STRENGTH DID NOT PRESENT SIGNIFICANT DIFFERENCES FOR BOTH ROUTES, THE FULL ANNEALING ROUTE SHOWED HIGHER TENSILE STRENGTH AND HARDNESS THAN THE ONE FOUND IN INTERCRITICAL ANNEALING ROUTE. CONSIDERING THE INCREASE IN DUCTILITY AS THE MAIN OBJECTIVE, THE INTERCRITICAL ANNEALING PROVED TO BE MORE EFFICIENT.

Keywords

Annealing; SAE 4130 steel; Degenerated pearlite

Annealing; SAE 4130 steel; Degenerated pearlite.