Banca de QUALIFICAÇÃO: MARIANA SANTOS BATTISTA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIANA SANTOS BATTISTA
DATE: 28/03/2026
TIME: 10:00
LOCAL: Remota
TITLE:

Effects of Welding Heat Input Variation on the Mechanical and Corrosion Resistance Properties of UNS S31803 Duplex Stainless Steel

KEY WORDS:

Duplex stainless steel; GTAW welding (Gas Tungsten Arc Welding); heat input; pitting corrosion; impact toughness.

PAGES: 40
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Física
SPECIALTY: Propriedades Mecânicas dos Metais e Ligas
SUMMARY:

      Duplex stainless steels exhibit a superior combination of mechanical strength and corrosion resistance and can be widely used in critical industrial sectors, such as the oil and gas and chemical industries. However, the thermal cycle imposed during welding may alter the microstructural balance between ferrite and austenite, affecting the most important characteristics of these materials: the mechanical performance and corrosion resistance of welded joints. In this context, this study aims to evaluate the influence of welding speed, and consequently heat input, on the localized corrosion resistance and impact toughness of welded joints in UNS S31803 duplex stainless steel. For this purpose, two tubular specimens with a diameter of 114.3 mm and a thickness of 6.02 mm will be welded using the multipass Gas Tungsten Arc Welding (GTAW) process, one using the parameters established in the welding procedure and the other with a reduced welding speed in order to increase the heat input. Samples extracted from the fusion zone and the heat-affected zone will be subjected to corrosion testing in accordance with ASTM G48 – Method A and Charpy V-Notch impact testing, allowing the evaluation of pitting corrosion resistance and toughness in the critical regions of the welded joint. The obtained results will be compared and analyzed to correlate the welding parameters, the microstructural changes induced by the thermal cycle, and the mechanical and corrosion performance of the material. It is expected that the increase in heat input will promote microstructural changes that negatively affect the phase balance, resulting in reduced performance of the evaluated properties. The results of this study aim to correlate heat input with the mechanical and corrosion resistance performance of welded joints in UNS S31803 duplex stainless steel, contributing to the definition of welding parameters that ensure adequate performance and structural integrity of the material.

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Interno - 1723192 - ANTONIO RENATO BIGANSOLLI
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Externa ao Programa - 1898760 - RENATA NUNES OLIVEIRA - UFRRJ