The effect of σ-phase precipitation at 800°c on the corrosion resistance in sea-water of a high alloyed duplex stainless steel

E IN S E A - W A T E R O F A HIGH ALLOYED DUPLEX STAINLESS STEEL M . E . WILMS,* V . J. GADGIL,t J. M . KROUGMAN* a n d F. P. IJSSELING* *Marine Materials Engineering Laboratory of the Royal Netherlands Naval College, P. O. Box 10000, 1780 CA Den Helder, The Netherlands tCentre for Materials Research (CMO), University of Twente, EL-TN Gebouw, P. O. Box 217, 7500 AE, The Netherlands Abstract--Super-duplex stainless steels are recently developed high alloyed stainless steels that combine good mechanical properties with excellent corrosion resistance. Because of a high content of chromium and molybdenum, these alloys are susceptible to o-phase precipitation during short exposure to temperatures between 650 and 950°C. The effect of 800°C aging on o-phase formation and on the mechanical properties of a super-duplex stainless steel have been reported previously by the authorsJ This investigation concerns the effect of o-phase precipitation at 800°C on the corrosion behaviour in seawater and comprises anodic polarization scans and potentiostatic crevice corrosion tests. A serious deterioration of the corrosion resistance is found after aging times longer than 7 min, resulting in a drop of both the critical crevice corrosion temperature (CCT) and the breakdown potential (Ebd). The initiation of localized corrosion takes place next to the o-phase, in the newly formed secondary austenite (Y2). INTRODUCTION DUPLEX stainless steels have a microstructure which consists…

3819 Fabrication 6/22/01 2:57 PM Page 3 DESIGNER HANDBOOK S TAINLESS STEEL FABRICATION Stainless Steel The Value Option ® TABLE OF CONTENTS General..................................................1 Characteristics of Stainless Steel ........2 Fabrication Properties ........................2 Drilling ...................................................2 Cutting...................................................2 Mechanical…

ESTUDO COMPARATIVO ENTRE OS AÇOS INOXIDÁVEIS DUPLEX E OS INOXIDÁVEIS AISI 304L/316L (b) Marcelo Senatore1, Leandro Finzetto2,Eduardo Perea3 (c) Abstract Ferritic-austenitic duplex stainless steels are part of a class of materials having two phase microestructure, comprised of ferritic matrix and austenitic islands, with volumetric fractions approximately the same in these phases. These class of materials is characterized by the presentation of an interesting combination of high…

microgramas/dia de Ni Referência: P.J. Cunat Ugine. Stainless Steel ’99. Science and Market. nucleoinox@nucleoinox.org.br Cr (microgramas) Produto Ni (microgramas) no produto após 1o. cozimento após 5 o. cozimento no produto após 1 o. cozimento após 5 o. cozimento Ruibarbo (140 g) 4,2 35 7,9 5,5 25 9,3 Damasco (140 g) 7,6 29,5 13 16 45,5 25 Geléia de limão (25 g) 0,8 1,3 0,8 1,9 2,2 1,9 Molho de tomate (30 g) 1,2 3,6 1,2 0,9 1,95 0,9 Batatas (220 g) …

após o tratamento térmico. Palavras chaves: aço inoxidável martensítico, corrosão, polarização anódica. Effect of Heat Treatment on the Microstructure and Corrosion Resistance of the 12Cr1,8Ni0,1C Alloy abstract The martensitic stainless steels CA15 with 11.5 weight percent maximum in chromium present austenitic structure to high temperatures (950–1000oC), that is transformed in martensitic when properly cooled until room temperature. However, the thermal cycles control…

pequena quantidade). Produtos químicos e usos finais do Cromo ICDACR. Esquema tecnológico da produção de Ferrocromo de alto carbono. Disponível em:http://www.icdacr.com/story-of-chrome/what-ischromium/discover-chromium/ore-processing.pdf Página 1, figura 1. Acesso em: 18 de abr. de 2014 Grunwerg 24 Piece Chopstick Style Stainless Steel Cutlery Set - 24BXCHP Disponível em: http://ecx.imagesamazon.com/images/I/61mV0aCgKiL._S L1398_.jpg Acesso em: 23 de abr. de 2014…

Mecânica do Centro Universitário da FEI rodrmagn@fei.edu.br. FORECAST METHODS OF THE DEFORMATION-LIFE CURVES IN FATIGUE FOR THE DUPLEX STAINLESS STEELS UNS S31803 AND UNS S32750 AND MARTENSITIC STAINLESS STEEL UNS S42000. Taylor Mac Intyer Fonseca Junior1 Rodrigo Magnabosco2 Abstract This work analyzed six methods of cyclic mechanical properties estimation from the monotonic mechanical properties, by comparison with the experimental results obtained in low cycle…

Ana Paula Ciscato Camillo et al. INOX: Corrosão Efeito do revenido na resistência à corrosão dos aços inoxidáveis supermartensíticos Effect of tempering on the corrosion resistance of supermartensitic stainless steels Resumo Aluna de Iniciação Científica, Departamento de Engenharia de Materiais da Universidade Federal de São Carlos - DEMa/UFSCar E-mail: anapaulaciscato@yahoo.com.br Os aços inoxidáveis supermartensíticos são utilizados nas indústrias de petróleo e gás, pois aliam boas…

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1999 Microstructural Evolution in a 17-4 PH Stainless Steel after Aging at 400°C M. MURAYAMA, Y. KATAYAMA and K. HONO The microstructure of 17-4 PH stainless steel at various stages of heat treatment, i.e. after solution heattreatment, tempering at 580°C and long term aging at 400°C, have been studied by atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). The solution treated specimen consists largely of martensite with a small fraction of δ-ferrite.…