Maraging-350 steel: Following the aging through diffractometric, magnetic and hyperfine analysis

Nunes, G. C. S.; Sarvezuk, P.W.C.; Alves, T. J. B.; Biondo, Valdecir; Ivashita, Flávio F.; Paesano, Andrea

doi:10.1016/j.jmmm.2016.08.052

Cited by 17 publications

(13 citation statements)

References 10 publications

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“…Due to misfit of the Bragg reflection (2 0 0) on the metallic phases and the knowledge that some maraging steels present tetragonal distortion [14][15][16], a second model (tetragonal version) was created using equivalent tetragonal structures for these phases.…”

Section: Xrd Analysismentioning

confidence: 99%

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

et al. 2021

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Maraging steels are martensitic steels hardened by precipitation of intermetallic compounds in thermal aging, with good machining properties and high strength, fracture toughness and corrosion resistance, being used in aircraft parts and rocket motor-case, tooling applications and nuclear plants. During thermal aging in steam atmosphere a protective and corrosion resistant oxide layer is formed over the bulk. In this work, conventional Bragg-Brentano geometry was used to identify the phases formed in four specimens of maraging steel grade 300 with different surface finishes that were previously solution annealed twice at (950 ± 5) °C for 1 h, air-cooled, and submitted to oxidation process under positive pressure about 1.5 kPa of steam at (480 ± 5) °C for 6 h, followed by forced air-cooling. Diffraction patterns were measured employing CuKα radiation, ranging 20º < 2θ < 85º and the Rietveld method was used to better characterize the structures identified. Through Rietveld refinements it was possible to conclude that the layer formed during heat treatment process is constituted by a transition metallic phase with a quasi-cubic face centered unit cell, and an oxide layer that includes hematite, magnetite and a spinel structure type MFe2O4, where M could be an alloying element, for all analyzed samples.

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Section: Xrd Analysismentioning

confidence: 99%

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

et al. 2021

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“…The nanometric structure of the precipitates makes them hard to analyse. Because of this, a variety of techniques have been used to study their precipitation behaviour, including: transmission electron microscopy (TEM) 4 , small angle X-ray scattering (SAXS) 7 , small angle neutron scattering (SANS) 8 , electrolyte extraction method 9 , positron annihilation 10 and Mӧssbauer spectroscopy [11][12][13][14][15] . Since Maraging-300 steel has about 66 wt% Fe, Mӧssbauer spectroscopy becomes a powerful local technique for studying the mobility and redistribution of solute atoms during ageing.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the redistribution of atoms was fast in the initial stages of ageing and then slowed down. Nunes et al 14 used Mӧssbauer spectroscopy to study samples aged at various temperatures above 480°C and longer ageing times (≤ 12 h). Li et al 15 studied the decomposition of Maraging-350 at low ageing temperature (430°C).…”

Section: Introductionmentioning

confidence: 99%

An Atomic Redistribution Study of the 440°C Ageing Kinetics in Maraging-300 Steel

Silva¹,

Vasconcelos

Silva

et al. 2019

Mat. Res.

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Mӧssbauer spectroscopy, X-ray diffraction and hardness measurements were used to investigate the atomic redistribution and phase transformation of solution-treated and 440°C aged Maraging-300 steel specimens. The ageing temperature that resulted in the best mechanical properties in this steel was 480ºC. At 440ºC, the formation of the precipitates that assure excellent mechanical properties of the maraging steel (Ni 3 Ti, Fe 2 Mo) was not expected. The results indicated that Mo and Ti redistribution was severe during the first hour of ageing. The mobility of the Ni atoms probably occurred during all stages of the ageing process, and the Co atoms remained close to Fe atomic sites. An irregular behaviour of the formation of paramagnetic phases containing iron was observed, and some evidence of the formation of these phases without Fe will be discussed. The formation of metastable phases was suggested and the possibility of austenite reversion was not discarded at this ageing temperature.

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“…Entretanto, dependendo das fases presentes e suas respectivas quantidades, os aços maraging podem ou não possuir boas propriedades mecânicas e magnéticas [19]. Dessa forma, salienta-se a importância dos estudos de sua microestrutura, visto que esta está diretamente ligada ao bom desempenho do material.…”

Section: Revisão Bibliográficaunclassified

“…Ambas aplicações se devem às propriedades mecânicas de ultra alta resistência mecânica, alta dureza e boa tenacidade. Além disso, existem aplicações mais diversas como virabrequins, engrenagens, ferramentas, equipamentos esportivos e produção de ímãs para rotores de alta velocidade [18,19,23].…”

Section: Histórico Dos Aços Maragingunclassified

Efeito da laminação a frio na reversão parcial da martensita em austenita durante tratamento térmico de envelhecimento de aço maraging 350.

Feitosa¹

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Ao meu querido orientador Prof. Dr. Angelo Fernando Padilha, que muito me ensinou e colaborou enormemente com o trabalho, sempre com bom humor e humildade, sendo um exemplo de orientador e ser humano.Ao antigo orientador, não menos querido, Prof. Dr. Hamilton Ferreira Gomes de Abreu, que me proporcionou a melhor oportunidade de mestrado que poderia ter e que mesmo à distância colaborou para melhoria do trabalho.A minha família que sempre me apoiou e me incentivou nos estudos, em especial minha avó, que é uma mulher à frente de seu tempo, sendo um exemplo a ser seguido. Ao prestimoso Dr. Julián David Escobar Atehortua, pelas oportunidades apresentadas e imensa ajuda com ensaios e resultados, além das boas conversas e descontrações.Ao minucioso Ms. Giovani Gonçalves Ribamar, pela grande ajuda com textos, experimentos e resultados, além de toda paciência, cuidado e cobrança.Ao querido amigo Profº Leandro Carvalho que deu início a esta linha de pesquisa, sendo seus avanços a base inicial deste trabalho.Ao grupo de pesquisa, informalmente, formado após tantos experimentos com síncrotron, composto pelos atenciosos Prof. Dr. Julian Arnaldo Ávila, Prof. Dr. João Oliveira e Ms. Fábio Conde, que ajudaram com informações, resultados e oportunidades.Aos amigos mestres Daniela Passarelo, César Narita e André Bernardes que foram sempre solícitos em ajudar com experimentos e conversas esclarecedoras nos intervalos para café.

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Maraging-350 steel: Following the aging through diffractometric, magnetic and hyperfine analysis

Cited by 17 publications

References 10 publications

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

An Atomic Redistribution Study of the 440°C Ageing Kinetics in Maraging-300 Steel

Efeito da laminação a frio na reversão parcial da martensita em austenita durante tratamento térmico de envelhecimento de aço maraging 350.

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