High temperature oxidation behavior of the AISI 430A and AISI 430E stainless steels in Ar/H2/H2O atmosphere

Salgado, Maria de Fátima; Sabioni, Antônio Claret Soares; Huntz, A.M.; Rossi, Edson Hugo

doi:10.1590/s1516-14392008000200020

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…The oxide scale growth rate is calculated by Equation 1, where M is the sample mass gain, A is the sample surface area, t is the oxidation time and Kp is the parabolic rate constant. The result of parabolic rate constant (Kp) ( Table 4) of the bare sample is consistent with values presented in studies in the literature [31][32][33] . It is observed that the Kp results (Table 4) are similar for all the samples, which demonstrate that the formation of oxide was not influenced by the difference in surface samples.…”

Section: Resultssupporting

confidence: 90%

Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel

et al. 2015

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Section: Resultssupporting

confidence: 90%

Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel

et al. 2015

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“…The spheres were smaller than 10 μm. The similar spinels forming spheres in the oxidized layer on ferrite steel were observed by [15]. The authors, taking into consideration of the increased content of Cr, Mn and O defined the spinels as MnCr 2 O 4 .…”

Section: Tests Results Of the Microstructure And Chemical Compositionsupporting

confidence: 63%

Characterization Of Oxide Layers Produced On The AISI 321 Stainless Steel After Annealing

Bochnowski¹,

Dziedzic²,

Adamiak³

et al. 2015

Archives of Metallurgy and Materials

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In this study, the structure, chemical composition and topography of oxide layers produced on the surface of the AISI 321 austenitic steel in the annealing process were analyzed. Heat treatment was done at 980°C temperature for 1 hour time in different conditions. The annealing was done in a ceramic furnace in oxidation atmosphere and in vacuum furnaces with cylindrical molybdenum and graphite chambers. The analysis was carried out using the following methods: a scanning electron microscope (SEM) equipped with an energy-dispersive X-ray spectrometer (EDX), a transmission electron microscope (TEM) equipped with an energy-dispersive X-ray spectrometer (EDX), an X-ray diffractometer (XRD), a secondary ion mass spectrometer with timeof-flight mass analyzer (TOF SIMS) and an atomic force microscope (AFM). The oxide layer formed during annealing of the AISI 321 steel at 980°C consisted of sub-layers, diversified in the chemical composition. The thickness of the oxidized layer is depended on the annealing conditions. In a ceramic furnace in oxidation atmosphere, the thickness of the oxide layer was of 300-500 nm, in a vacuum furnace with molybdenum and graphite heating chambers, it ranged from 40 to 300 nm and from a few to 50 nm, respectively. TOF SIMS method allows to get average (for the surface of 100 μm × 100 μm) depth profiles of concentration of particular elements and elements combined with oxygen. In oxide layers formed in vacuum furnaces there are no iron oxides. Titanium, apart from being bounded with carbon in carbides, is a component of the oxide layer formed on the surface of the AISI 321 steel.Keywords: depth profile, oxide layer, stainless steel, TEM, TOF SIMS W pracy analizowano strukturę, skład chemiczny oraz topografię warstwy tlenków powstałych na powierzchni stali austenitycznej AISI 321 w procesie wyżarzania. Obróbkę cieplną prowadzono w temperaturze 980°C w czasie 1 godziny w zróżnicowanych warunkach. Wyżarzanie prowadzono w piecu ceramicznym w atmosferze powietrza oraz w piecach próżniowych z cylindryczną komorą molibdenową i grafitową. W prowadzonej analizie wykorzystano skaningowy mikroskop elektronowy (SEM) wyposażony w spektrometr promieniowania X (EDX), transmisyjny mikroskop elektronowy (TEM) wyposażony w spektrometr promieniowania X (EDX), dyfraktometr rentgenowski (XRD X-Ray Diffraction), spektrometr mas jonów wtórnych z analizatorem czasu przelotu (TOF SIMS) oraz mikroskop sił atomowych (AFM). Warstwa tlenków powstała w wyniku wyżarzania stali AISI 321 w temperaturze 980°C składała się z podwarstw różniących się składem chemicznym. O grubości warstwy utlenionej w decydowały warunki wyżarzania. W piecu ceramicznym z atmosferą powietrza grubość warstwy tlenków wynosiła 300-500 μm, w piecu próżniowym z grafitową i molibdenową komorą grzejną grubości wynosiły odpowiednio od 40 nm do 300 nm oraz kilka nm do 50 nm.Badania TOF SIMS pozwalają otrzymać uśrednione profile koncentracji pierwiastków metalicznych oraz profile koncentracji pierwiastków metalicznych będących w kontakcie z tlenem. W wa...

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“…Dessa forma uma grande quantidade de cromo é removida de uma faixa relativamente estreita, deixando regiões dos contornos de grãos (empobrecidas) que podem ficar com até 2% de cromo a menos [7]. Tal fenômeno foi observado por Salgado [6], ao afirmar que a microestrutura dos filmes formados sobre o aço AISI 430A, oxidado em atmosfera de argônio, por 50 h, também apresentou o mesmo comportamento, para temperatura de 850 °C. Já a 950 °C a microestrutura apresenta partículas contendo cromo, ou seja, mesmo a 950 °C houve formação de filme aderente de óxido de cromo sobre o aço, apesar da ocorrência de perda de massa por unidade de área.…”

Section: Análise Microestrutural E Composicional Dos óXidos Formadosunclassified

“…Em todos os meios onde há presença de oxigênio o aço está sujeito a oxidação, mesmo em atmosfera protetora como é o caso do gás argônio contendo 1ppm de O 2 , suficiente para causar oxidação no aço [6].…”

Section: Introductionunclassified

Oxidação Do Aço Inoxidável Abnt 5601 - Grau 409 Em Altas Temperaturas Em Atmosfera De Argônio

Serra¹,

Brandim²,

Santos³

et al. 2018

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoAços inoxidáveis são ligas ferrosas resistentes à corrosão, devido seu alto teor de cromo. São utilizadas em ambientes com gases agressivos em altas temperaturas especialmente na indústria e aplicações tecnológicas. O objetivo desta pesquisa é investigar a cinética de crescimento e a composição de filmes do óxido formados sobre o aço ABNT 5601 -grau 409 entre as temperaturas 850 °C e 950 °C, na atmosfera de argônio, contendo 1ppm de O 2 . As amostras foram oxidadas em uma termobalança, com sensibilidade de ± 1 µg, por 43,4 horas de exposição. A cinética de crescimento dos filmes de óxidos foi estabelecida medindo-se o ganho de massa por unidade de área versus tempo de oxidação seguindo uma lei parabólica. A microestrutura e a composição química dos óxidos foram analisadas por microscopia eletrônica de varredura, espectroscopia dispersiva de energia. Análises químicas descrevem que os filmes formados sobre o aço ABNT 5601 -grau 409 nas diferentes temperaturas em argônio contêm o cromo como elemento majoritário além do Mn, Fe, Ti. Ao se comparar as taxas de oxidação, nas diferentes temperaturas, entre 850 e 950 °C observa-se que o aço apresenta maior taxa de oxidação a 850 °C e menor a 950 ºC. Palavras-chave: ABNT 5601 -grau 409; Oxidação em argônio; Oxidação em altas temperaturas. OXIDATION ABNT 5601 DEGREE 409 FERRITIC STAINLESS STEEL AT HIGH TEMPERATURE IN ARGON ATMOSPHERE AbstractStainless steels are resistant to corrosion due to its high chromium content and are therefore often used in environments containing aggressive gases at high temperatures, especially in industry and technological applications. The objective of this research is to investigate the growth kinetics and composition of oxide films formed on stainless steel degree 409 temperatures between 850 °C and 950 °C in argon atmosphere containing 1 ppm O 2 . The samples were oxidized in a thermobalance with a sensitivity of ± 1 µg for 43.4 h. The kinetics of oxide film growth was determined by measuring the mass gain per unit area as a function of time and found to be parabolic. The microstructure and chemical composition of the oxides formed were studied or determined using a scanning electron microscope coupled to an energy dispersive spectrometer. Chemical analysis of the films formed in argon on stainless steel ABNT 5601 degree 409 revealed mainly Cr besides Mn, Fe and Ti. Comparison of the rates of oxidation between 850 and 950 °C showed that the steel oxidized at a higher rate at 850 °C than at 950 °C.

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High temperature oxidation behavior of the AISI 430A and AISI 430E stainless steels in Ar/H2/H2O atmosphere

Cited by 14 publications

References 7 publications

Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel

Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel

Characterization Of Oxide Layers Produced On The AISI 321 Stainless Steel After Annealing

Oxidação Do Aço Inoxidável Abnt 5601 - Grau 409 Em Altas Temperaturas Em Atmosfera De Argônio

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