Creep and stress relaxation in 18% Ni (250) maraging steel

Gurewitz, G.; Atzmon, N.; Rosen, A.

doi:10.1179/030716977803291962

Cited by 9 publications

(6 citation statements)

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“…The average hardness increased from 331 ± 5 HV in the solution treated condition to 604 ± 18 HV after aging. The precipitation behavior and precipitation hardening mechanism at the aging temperature in this study are supported by other reports [2,4,6,8,9,[11][12][13]. Fig.…”

Section: Resultssupporting

confidence: 91%

“…Since nickel, one of the major alloying elements, is an austenite stabilizer, the reversion tendency to austenite depends on whether the alloying elements enrich or deplete the matrix with respect to nickel [1][2][3][4]6]. Data available on the mechanical properties of maraging steel at elevated temperature under creep are scarce [3,[7][8][9][10]. Specialized applications of the steel occasionally demand short-time exposures to high temperatures and it is desirable to have data on the creep behavior of the material during such service conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Specialized applications of the steel occasionally demand short-time exposures to high temperatures and it is desirable to have data on the creep behavior of the material during such service conditions. Although there are some research on the identification of precipitates in maraging steels [1][2][3][4]6,8,9,[11][12][13], there is no study related to the studying of microstructure, morphology of precipitates and reverted austenite after exposure to high temperature and stress during creep tests and their relation to mechanical properties. Therefore, an investigation of microstructure and its correlation with creep behavior at high temperature in maraging 300 steel is a subject of interest and is discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature creep resistance and effects on the austenite reversion and precipitation of 18 Ni (300) maraging steel

Reis

Abdalla

et al. 2015

Materials Characterization

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a b s t r a c tIn this paper, the high-temperature creep resistance and effects on the austenite reversion and the dynamic evolution of precipitates of maraging 300 steel were investigated. The main strengthening mechanism in a solution treated and aged material is the fine needle shaped Ni 3 (Ti,Mo) precipitates densely dispersed in a single martensitic phase. The specimens were submitted to creep tests at temperatures of 550, 600 and 650°C and stress conditions of 200, 300 and 500 MPa. Stress exponent (n) varied from 6.0 to 7.2 and activation energy for creep (Q c ) from 364 to 448 kJ/mol, associated to the tangled and cells arrangements of the dislocations, show that the dominant creep mechanism is controlled by dislocations climb and slip. The experimentally determined threshold stresses are about 25 MPa at 550°C and close to 4 MPa at 600 and 650°C. Due to high-temperature creep exposure, part of martensite was reverted to austenite in a range of 17.2% to 48.5%, depending upon the time, temperature and applied stress. At the same time, the Ni 3 (Ti,Mo) precipitates were coarsened and Fe 2 Mo precipitated, leading to undesirable alloy's strength reduction. Volume fraction of reverted austenite showed strong negative correlation with hardness. Fracture surfaces of specimens presented ductile failure consisting of equiaxed and bi-modal dimples in the fibrous zone surrounded by 45°shear lip.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-temperature creep resistance and effects on the austenite reversion and precipitation of 18 Ni (300) maraging steel

Reis

Abdalla

et al. 2015

Materials Characterization

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“…Embora um considerável trabalho tenha sido realizado no passado para gerar dados das propriedades mecânicas dos graus inferiores, apenas limitada informação está disponível na literatura das propriedades mecânicas do maraging 300 [3]. Dados disponíveis das propriedades mecânicas dos aços maraging a temperaturas elevadas são muito escassos e a maioria dos estudos nos graus inferiores estão limitados a propriedades de tração ou estudos de resistência a ruptura até 540°C [1,4]. Aplicações especializadas deste aço ocasionalmente poderão demandar exposições a temperaturas altas e é desejável ter dados do comportamento em fluência do material durantes estas condições de serviço.…”

Section: Introductionunclassified

Avaliação Das Propriedades De Fluência a 600 °c Do Aço Maraging 300 Solubilizado

Reis

Abdalla³

et al. 2014

TMM

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Aços maraging são ligas Ni-Co-Mo-Ti de ultra alta resistência e vasta aplicação, de fundamental interesse no setor aeroespacial em razão de elevada resistência mecânica, aliada a uma excelente tenacidade. Estes aços têm sido propostos para substituir o aço 300 M ou o aço 4340 em partes do veículo lançador de satélites brasileiro (VLS). O aço maraging é formado por uma estrutura martensítica metaestável que pode sofrer reversão para austenita quando aquecidos em temperaturas próximas à temperatura de envelhecimento, sendo esse efeito aumentado com a elevação da temperatura e tempo de tratamento. Sendo assim, o estudo do comportamento em fluência em temperaturas elevadas tem importância tecnológica para o desenvolvimento deste material. Neste trabalho o comportamento em fluência de um aço maraging 300 é avaliado por testes de fluência numa faixa de tensão entre 200 MPa e 500 MPa a 600°C. Os parâmetros de fluência, tais como taxa de fluência no estado secundário (ε· s ), tempo final de fluência (t f ) e expoente de tensão na fluência secundária (n), são determinados. Estes parâmetros são muito importantes para determinação da resistência à fluência do material. Palavras-chave: Aço maraging; Fluência; Comportamento mecânico em temperaturas elevadas.

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“…Maraging steels have good machining properties and are widely used in many military and commercial industries, mainly for aircraft, aerospace and tooling applications, for example as a rocket motor case and in the important parts of airplanes [1,3]. Data available on the mechanical properties of Maraging steels at elevated temperature are scarce and most of the studies on the low grades were confined to tensile properties or stress-rupture studies up to 540ºC [2,5]. Specialized applications of the steel occasionally demand short-time exposures at unusually high temperatures and it is desirable to have data on the creep behavior of the material during such service conditions.…”

Section: Introductionmentioning

confidence: 99%

Creep Properties at 650ºc of Maraging 300 Steel Solution Annealed

Reis¹,

Reis²,

Abdalla³

et al. 2014

ABM Proceedings

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In the development of the structural materials for the advanced applications, as in the aerospace industry, there is a constant strive to increase both strength and toughness. Maraging steels are iron-nickel alloys designed to combine both properties that are achieved through the age-hardening of low carbon martensite. This alloy have a metastable martensitic structure that can revert to austenite when heated in temperatures close to the aging temperature, and this effect can be enhanced with the temperature increasing and time of treatment. Therefore, the study of creep behavior in elevated temperatures has technological importance to the development of this material. In this work the creep behavior of a maraging 300 steel solution annealed is evaluated by carrying out creep tests at 650ºC and in a stress of 200, 300 and 500 MPa. Creep parameters, such as steady state creep rate (̇), final creep time (tf), and stress exponent from secondary creep (n) are determined, considering that they are important to evaluate the creep resistance of the material.

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Creep and stress relaxation in 18% Ni (250) maraging steel

Cited by 9 publications

References 1 publication

High-temperature creep resistance and effects on the austenite reversion and precipitation of 18 Ni (300) maraging steel

High-temperature creep resistance and effects on the austenite reversion and precipitation of 18 Ni (300) maraging steel

Avaliação Das Propriedades De Fluência a 600 °c Do Aço Maraging 300 Solubilizado

Creep Properties at 650ºc of Maraging 300 Steel Solution Annealed

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