Heat Treatment Effects on ASTM A890/A 890M GR 5A Super Duplex Stainless Steel Passivity

Lima, Hillane Mirelle Lopes Ferreira de; Bastos, Ivan Napoleão; Araújo, Walney Silva; Martins, Marcelo Guerra

doi:10.1590/1980-5373-mr-2017-0865

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…) have been performed using a 100 kN capacity Shimadzu  AG-X universal mechanical testing machine. The tests followed the ASTM E606-12 standard and some procedures observed in Lima et al 8 and Palumbo et al 12 . Table 2 presents the strain rates adopted in the study.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Many studies have been performed about microstructural and metalurgical aspects of these alloys (weldability, aging, heat treatments, phases, etc. for instance see [2][3][4][5][6][7][8][9][10][11][12] , but only a few about the phenomenological aspects of the macrossopic mechanical behavior, mainly concerned with Finite Element simulations 9,10 . It is not the goal of the present paper to perform an extensive review of these studies, but the previously mentioned references give a reasonable idea of the research in thie area.…”

Section: Introductionmentioning

confidence: 99%

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Strain Rate Sensitivity Analysis of Duplex and Superduplex Steels in Tensile Tests

et al. 2020

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Duplex and super duplex stainless steels have high corrosion resistance, excellent mechanical properties, and high impact strength. Such characteristics make these steels able to operate in various segments of the industry, especially in aggressive environments. These alloys have higher strength than austenitic and ferritic stainless steels and their operation is generally restricted to temperatures lower than 300 °C. Most steels and alloys only exhibit elasto-viscoplastic behavior at temperatures higher than 1/3 of the absolute melting temperature. The objective of this work was to make an experimental study showing that the duplex and superduplex steels present a rate-dependent behavior even at room temperature (around 25 °C). Two different alloys: duplex stainless steel UNS 31803F51 and super duplex UNS S32760GRF55 were used in the study. Simple models were proposed to describe how the rate-dependent portion of the stress (called at this paper "the viscous term") depends on the strain rate. A simple procedure to identify experimentally all material constants that appear in the theory is presented. The experimental results are in very good agreement with the model predictions.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain Rate Sensitivity Analysis of Duplex and Superduplex Steels in Tensile Tests

et al. 2020

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“…Sigma precipitates can appear in various series of stainless steels, thus leading to undesirable effects, such as decreased corrosion resistance, and loss of both weldability and mechanical properties [15][16][17][18] . The σ phase can precipitate in elevated-temperature processes, such as casting, aging, welding and forging.…”

Section: Introductionmentioning

confidence: 99%

Dilatometric Cycles in the Study of Precipitation of Intermetallic Phases in Duplex Stainless Steels

et al. 2020

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Duplex stainless steels (DSS) are used in offshore platforms due to their good properties resulting from the combination of two phases, namely austenite and ferrite. Secondary intermetallic phases, such as alpha prime (α´) and sigma (σ), which are harmful, can be formed at temperatures above 400 °C, or by a casting process. This study investigates the formation of sigma phase by thermal cycles running in a dilatometer (800 °C, 850 °C, 900 °C and 1,000 °C) for 1h, and at 850 °C for 3h and 7h. The optical microscopy of the DSS microstructure subjected to 800, 850 and 900 °C for one hour revealed a small fraction of σ phase with nucleation in the contour of ferrite/austenite phases, and tests by ferritoscope indicated a decrease (~4%) in a magnetic fraction (ferrite). However, samples subjected to dilatometric cycles at 850 °C for 3 hours showed an 18% decrease in the magnetic phase and quantitative metallography revealed a 33% fraction of σ phase precipitated in the ferrite phase. Tests conducted at 850 ºC for 7 hours indicated a high fraction of σ phase precipitated (approximately 50%), starting in the grain boundary, austenite/ferrite, and advancing in ferrite grain.

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Corrosion Resistance of Cast Duplex Stainless Steels Grades ASTM A890 1B and 3A in Electrolytes Containing Chloride, Carbon Dioxide and Thiosulfate

Lima

Tavares²,

Araújo³

et al. 2022

J. of Materi Eng and Perform

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Heat Treatment Effects on ASTM A890/A 890M GR 5A Super Duplex Stainless Steel Passivity

Cited by 5 publications

References 29 publications

Strain Rate Sensitivity Analysis of Duplex and Superduplex Steels in Tensile Tests

Strain Rate Sensitivity Analysis of Duplex and Superduplex Steels in Tensile Tests

Dilatometric Cycles in the Study of Precipitation of Intermetallic Phases in Duplex Stainless Steels

Corrosion Resistance of Cast Duplex Stainless Steels Grades ASTM A890 1B and 3A in Electrolytes Containing Chloride, Carbon Dioxide and Thiosulfate

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