Microstructural changes produced by plastic deformation in the UNS S31803 duplex stainless steel

Tavares, Sérgio Souto Maior; Silva, Manoel Ribeiro da; Pardal, Juan Manuel; Abreu, Hamilton Ferreira Gomes de; Gomes, A. M.

doi:10.1016/j.jmatprotec.2006.07.008

Cited by 99 publications

(51 citation statements)

References 11 publications

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“…It is noticed that the increase of the milling time promotes the percentage increase of the ferromagnetic phase. The magnetization saturation increase with cold deformation process confirms the α′ generation by the γ → α′ reaction 20 . For the 5 hour milling time, an increase in the saturation magnetization values was observed in relation to the material as received, and consequently the amount of martensitic phase formed.…”

Section: Resultssupporting

confidence: 55%

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Structural and Magnetic Properties of Duplex Stainless steel (UNS S31803) Powders Obtained by high Energy Milling of Chips with Additions of NbC

Mendonça

Oliveira

et al. 2017

Mat. Res.

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In this study, the high energy mechanical milling was utilized to the production of duplex stainless steel powders from the recycling chips with and without the addition niobium carbide. The effect of milling time and addition carbide on the morphology, particle size and magnetic properties of the powders was investigated. The utilization of the powder metallurgy constitute an important alternative for the reuse of waste in the industrial sector. The milling was realized using a planetary ball mill for 20 hours at a milling speed of 350 rpm and ball-to-powder weight ratio of 15:1were used, and the (0% and 3 wt. %) niobium carbide (NbC) addition. Scanning electron microscopy and particle distribution analysis were used for characterization of morphology and measure of particle size. Also, to analyze the transformations of phases were investigated using the magnetic characterization and x-ray diffraction. The results indicated that the addition of niobium carbide results in the reduction of the particle size of steel of the order of 20%, besides the reduces the transformation of austenite into strain induced martensitic phase.

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Section: Resultssupporting

confidence: 55%

“…The amount of ferromagnetic phase was obtained as a function of saturation magnetization, using the formula 20 .…”

Section: Methodsmentioning

confidence: 99%

Structural and Magnetic Properties of Duplex Stainless steel (UNS S31803) Powders Obtained by high Energy Milling of Chips with Additions of NbC

Mendonça

Oliveira

et al. 2017

Mat. Res.

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“…Many authors studied the deformation induced martensites in austenitic [15][16][17][18][19][20][21][22] , duplex and lean duplex stainless steels [23][24] . Both ε-and α'-martensites can be observed by transmission electron microcopy (TEM) and quantified by X-ray diffraction (XRD).…”

Section: Methodsmentioning

confidence: 99%

“…Both ε-and α'-martensites can be observed by transmission electron microcopy (TEM) and quantified by X-ray diffraction (XRD). Additionally, α'-martensite is ferromagnetic and, thus, can also be quantified by magnetic measurements [20][21][22][23][24] .…”

Section: Methodsmentioning

confidence: 99%

“…It is worth noting that the Cr-rich precipitate produced by spinodal decomposition and the magnetic martensite produced by cold working are usually cited with the same symbol (α') [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] , but these are phases completely distinct. For this reason, in this paper, the Cr-rich precipitate produced by spinodal decomposition was called α 1 .…”

Section: Methodsmentioning

confidence: 99%

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Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

et al. 2017

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The AISI 317L stainless steel is an austenitic grade with at least 3%Mo. Recently, this steel has replaced AISI 316L in many applications in chemical and petrochemical industries, due to its higher pitting corrosion resistance. The microstructure of the hot rolled and annealed material studied in this work consists of austenitic grains and 4.0% of delta ferrite (δ) with elongated islands morphology. This microstructure was modified by three processes: cold rolling with 87% of reduction, aging at 450 o C for 400 h, and welding by gas tungsten arc welding (GTAW) process. The corrosion resistance was evaluated by anodic polarization tests (ASTM G-61) and critical pitting temperature tests (ASTM G-150). Cold rolling produced a microstructure consisting of elongated grains of austenite and martensite α', high dislocation density and the elongated islands of delta ferrite present in the annealed material. Welding produced a dendritic microstructure with 7.0% of delta ferrite and some σ precipitated in the ferrite. Finally, the aging at 450 o C for 400 h provoked the decomposition of ferrite. The results show that these microstructural changes affected the pitting corrosion resistance, as detected by ASTM G-61 and ASTM G-150 tests.

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Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

Zhou

Xiong

Zha³

et al. 2020

Adv Eng Mater

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Thermomechanical deformation is one of the most efficient and facile routes to tailor microstructure in structural materials for mechanical property enhancement. Herein, the Ce‐modified SAF2507 super duplex stainless steel (Ce‐SAF2507) is deformed at different levels from 30% to 90% at a cryogenic temperature (–196 °C) to achieve superior mechanical performances. Cryogenic rolling increase fiber texture and induce ultra‐fine grain refinement which brings grains to ≈10 nm in the selected steel. The high‐density dislocations and deformation twins in the cryogenically rolled Ce‐SAF2507 lead to the nucleation and growth of martensite. Increases in the martensite volume fraction and nanoscale grain refinement occur at higher deformation levels. Cryogenically rolled deformation results in the overall increase in the Ce‐SAF2507 hardness. A higher hardness increment of austenite–martensite dual‐phase compared to that of ferrite is attributed to the austenite–martensite's higher work hardening ability. Furthermore, the ultimate tensile strength and yield strength increase with the deformation level, but the elongation decrease. Observed microstructural evolutions induced by cryogenic rolling enunciate the superiority of the present method over conventional ones to promote steel’ mechanical properties.

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Microstructural changes produced by plastic deformation in the UNS S31803 duplex stainless steel

Cited by 99 publications

References 11 publications

Structural and Magnetic Properties of Duplex Stainless steel (UNS S31803) Powders Obtained by high Energy Milling of Chips with Additions of NbC

Structural and Magnetic Properties of Duplex Stainless steel (UNS S31803) Powders Obtained by high Energy Milling of Chips with Additions of NbC

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

Microstructural Evolution Induced Mechanical Property Enhancement in Cryogenically Rolled Ce‐Modified SAF2507 Super Duplex Stainless Steel

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