Título

SIMULAÇÃO NUMÉRICA E FÍSICA DO PROCESSO DE SOLDAGEM AO ARCO SUBMERSO EM UM AÇO API 5L

NUMERICAL AND PHYSICAL SIMULATION OF THE SUBMERGED ARC WELDING PROCESS ON API 5L-X80 STEEL: EFFECT OF COOLING RATE ON THE MICROSTRUCTURAL EVOLUTION OF THE GRAIN GROWTH HAZ

Autoria

OLIVEIRA, DAYNARA FAUSTINA MOREIRA DE; PORCARO, RODRIGO RANGEL; FARIA, GERALDO LÚCIO DE

OLIVEIRA, DAYNARA FAUSTINA MOREIRA DE

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PORCARO, RODRIGO RANGEL

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FARIA, GERALDO LÚCIO DE

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DOI

10.5151/2594-5327-41029

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Resumo

DIFERENTES VARIáVEIS DE SOLDAGEM PODEM INFLUENCIAR NA FORMAçãO DE CONSTITUINTES MA (MARTENSITA

DIFFERENT WELDING VARIABLES CAN INFLUENCE THE FORMATION OF MA CONSTITUENTS (MARTENSITE-RETAINED AUSTENITE) IN THE COARSE-GRAINED HEAT-AFFECTED ZONE (CGHAZ). HOWEVER, THE EFFECT OF THE COOLING RATE ON THE VOLUME FRACTION IS STILL LITTLE STUDIED, WITH CONTRADICTORY RESULTS IN THE LITERATURE. IN THIS SENSE, THIS WORK EVALUATED THE RELATIONSHIPS BETWEEN HEAT INPUT (COOLING RATE) AND THE MICROSTRUCTURAL EVOLUTION OF THE ZTA-GG OF AN API 5L-X80 STEEL. NUMERICAL/PHYSICAL SIMULATION WAS USED AS AN ANALYSIS TOOL. BASED ON THE RESULTS OF THE COMPUTATIONAL MODELS, FOUR DIFFERENT COOLING RATE CONDITIONS (BETWEEN 800°C AND 500°C) WERE APPLIED TO THE DILATOMETRY SPECIMENS. IT WAS OBSERVED THAT INCREASING THE RATE FROM 2.6°C/S TO 9°C/S LED TO THE FORMATION OF BAINITIC MICROSTRUCTURES. FURTHERMORE, DUE TO THE INCREASE IN THIS PARAMETER, THERE WAS AN INCREASE IN THE MA FRACTION. BUT, FOR THE HIGHEST SPEED (18°C/S), A DECREASE WAS NOTED, WHICH WAS RELATED TO THE FORMATION OF MARTENSITE IN THE MATRIX. IT WAS CONCLUDED THAT THE STUDIED STEEL IS VERY SUSCEPTIBLE TO THE EFFECTS OF THERMAL INPUT/COOLING RATE IN TERMS OF THE FRACTION AND MORPHOLOGY OF MA CONSTITUENTS AND THAT, THEREFORE, THIS RELATIONSHIP CANNOT BE IGNORED WHEN DEFINING OPTIMIZED WELDING PARAMETERS.

Palavras-chave

Aço API 5L-X80; Simulação Numérica; Simulação Física; Constituintes MA; Soldagem SAW

API 5L-X80 steel; Numerical Simulation; Physical Simulation; MA Constituents; SAW welding; Heat Affected Zone.