Eventos Anais de eventos
COBEF 2019
COBEF 2019
EFFECT OF HEAT TREATMENT AFTER WELDING ON THE IMPACT TOUGHNESS OF ASTM A890/A890M SUPERDUPLEX STAINLESS STEEL
Submission Author:
Clélia Ribeiro de Oliveira , SP , Brazil
Co-Authors:
Clélia Ribeiro de Oliveira, Eloá Lopes Maia, Solange Tamara Fonseca, Marcelo Martins, Julian Arnaldo Avila Diaz, Paulo Roberto Mei
Presenter: Clélia Ribeiro de Oliveira
doi://10.26678/ABCM.COBEF2019.COF2019-0583
Abstract
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.
Keywords
Superduplex stainless steels, Impact toughness, Post welded heat treatment
