EFFECT OF HEAT TREATMENT AFTER WELDING ON THE IMPACT TOUGHNESS OF ASTM A890/A890M SUPERDUPLEX STAINLESS STEEL

Ano: 2019

Instituições de ensino: Universidade Estadual de Campinas, Universidade Estadual de Campinas, Universidade Estadual de Campinas, Centro Universitário Salesiano de São Paulo, Universidade Estadual Paulista "Júlio de Mesquita Filho", Universidade Estadual de Campinas

Idioma: Ingles

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Resumo

Superduplex stainless steels are materials that have excellent mechanical and corrosion resistance properties. The ASTM A890/A890M standard steels are obtained by casting process and applied to parts with complex geometries for harsh environments. In this work, the impact toughness at temperatures of 25 °C and -46 °C in electric arc welded joints with coated electrode in the base metal (BM)l and in the fusion zone (FZ) were analyzed. The microstructural aspects were observed with optical and electronic scanning microscopes. The impact toughness obtained on the BM was 64 J (-46 °C)/94 J (25 °C) and on the FZ in the as-welded condition and post-welded heat treatment were 54 J (-46 °C)/85 J (25 °C) and 75 J (-46 °C)/122 J (25 °C), respectively. In all conditions the impact toughness was greater than 27 J, the minimum value specified by the NORSOK standard. The post weld heat treatment promoted the adjustment of ferrite/austenite phases to more equivalent proportions from 61/39 to 49/51 in the fusion zone which resulted in an increasing on the impact toughness.

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