Characterization of precipitates in a 7.9Cr–1.65Mo–1.25Si–1.2V steel during tempering

Djebaili, Hamid; Zedira, Hamma; Djelloul, A.; Boumaza, A.

doi:10.1016/j.matchar.2009.03.007

Cited by 28 publications

(13 citation statements)

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“…When tempering at 300 °C, many needles and strips of precipitates form in steel microstructure, at the interface of lath and in lath internally. The precipitate formation is related with condensation of supersaturated C atoms in martensitic matrix (Djebaili et al 2009). At about 250-300 °C, ε (Fe 2.4 C) carbides transform to θ carbide (M 3 C) needles, in microstructure.…”

Section: Impact Toughness Under Different Tempering Temperaturementioning

confidence: 99%

“…Since the steel contains W, V and other carbide forming elements, tempering in this temperature range will make V 4 C 3 and W 2 C precipitate. Secondary hardening effect (Djebaili et al 2009) causes a peak in hardness. The dispersion of fine carbides has very strong dislocation pinning effect in matrix.…”

Section: Impact Toughness Under Different Tempering Temperaturementioning

confidence: 99%

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9-12Cr Heat-Resistant Steels

Yan

Wang

Shan³

et al. 2015

Engineering Materials

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Section: Impact Toughness Under Different Tempering Temperaturementioning

confidence: 99%

Section: Impact Toughness Under Different Tempering Temperaturementioning

confidence: 99%

9-12Cr Heat-Resistant Steels

Yan

Wang

Shan³

et al. 2015

Engineering Materials

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“…The strength and toughness of martensitic steel can be increased by grain refinement . Previous research reported that carbides, mainly M 7 C 3 and M 23 C 6 , were formed during normalizing or quenching and tempering of medium–high chromium martensitic steels, and that these precipitates distributed inside the martensite laths and could refine the lath thickness and improve the mechanical properties . With multiple carbide‐forming alloying elements, a considerable grain refinement could be possible in martensitic steel during diffusion annealing.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Holding Time on the Microstructure and Mechanical Properties of a 58CrMnSiNiMo Wear‐Resistant Cast Steel during Diffusion Annealing

Pei

Song

et al. 2019

steel research int.

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The microstructure and mechanical properties of a 58CrMnSiNiMo wear‐resistant cast steel with or without diffusion annealing heat treatment are investigated. The results reveal a microstructural inhomogeneity and variation in the chemical composition of the steel without diffusion annealing, and the microstructural inhomogeneity is characterized by a dislocation substructure in the lath martensite and a twin substructure in the lenticular martensite. After diffusion annealing, the inhomogeneity is effectively reduced, and some complicated lath orientations are produced. With an increase in the diffusion annealing holding time, the average spacing of the martensite laths increases by 54.48%, with a value of 0.79 μm. After diffusion annealing, the second‐phase precipitates, mainly identified as M7C3 and M23C6 carbides, accelerate the division/formation of packet boundaries, block boundaries, and lath boundaries, and pin the packet boundaries and block boundaries. The diffusion annealing process significantly improves the ultimate tensile strength and toughness of the experimental steel from 1775 MPa and 44 J cm−2 to a maximum of 2029 MPa and 143.1 J cm−2, respectively. After diffusion annealing, an increase in the toughness is attributed to high density dislocations in the martensite laths as well as thin lamellae of retained austenite between or around the corners of these laths.

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“…Sua resistência à fluência é influenciada devido aos dois tipos de mecanismos de endurecimento: por solução sólida e por precipitação, que estão relacionados diretamente com a variação de temperatura de serviço e do tempo de exposição à temperatura [4,5,6]. Com a adição de elementos químicos, como o V, Nb ou Ti, estes aços apresentam maiores níveis de resistência mecânica [1,7] e maior resistência ao ataque pelo hidrogênio, com maior temperatura de transição (dúctilfrágil) -29°C, melhores propriedades de fluência, menor susceptibilidade a fragilização por revenido e muito menor susceptibilidade ao descolamento, quando comparado com o aço Cr-Mo convencional [3].…”

Section: Introductionunclassified

EFEITO DO HIDROGÊNIO NO AÇO 2,25Cr-1Mo-0,25V ENVELHECIDO EM DIFERENTES CONDIÇÕES.

Manosalva¹,

Silva²,

Eckestein³

et al. 2017

Anais Do Congresso Anual Da ABM

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Resumo Este trabalho investigou o efeito do hidrogênio nas propriedades do aço 2,25Cr-1Mo-0,25V. As amostras foram envelhecidas a 600°C por 100h e 600h. Uma parte dos corpos de prova foi deixada somente na condição envelhecida e conduzidas ao ensaio de tração. Outras partes dos corpos de prova foram carregados com hidrogênio, sob tensão elástica e sem tensão aplicada, antes de serem conduzidos ao ensaio de tração. Análises microestrutural e fractografias foram realizadas via microscopia eletrônica de varredura (MEV). Os corpos de prova envelhecidos por 600h não apresentaram significante diferença entre as tensões de escoamento e máxima, entre os corpos de prova carreagados com hidrogênio e não carregados (envelhecidos). Os corpos de prova envelhecidos por 100h e carregados com hidrogênio, no entanto, apresentaram uma queda nas tensões de escoamento e máxima quando comparadas com os corpos de prova somente envelhecidos. Palavras-chave: Aço 2,25Cr-1Mo-0,25V; Hidrogênio; Propriedades mecânicas; Envelhecimento HYDROGEN EFFECT ON THE MECHANICAL PROPERTIES OF 2,25Cr-1Mo-0,25V STEEL UNDER DIFFERENT AGING CONDITION Abstract This work investigates the effects of hydrogen on the mechanical properties of 2,25Cr-1Mo-0,25V steel. The samples were aged at 600°C for 100h and 600h. For each set, of one of the samples was left uncharged. Hydrogen charging of the other two samples was conducted respectively under stress free and axial elastic stress and conditions. Microstructural analyses and fractographies were performed via scanning electronic microscopy (SEM). Samples aged for 600h presented no significant difference concerning yield and ultimate strengths between charged and non-charged samples (aged). Charged samples aged for 100h however, displayed a drop on yield and ultimate strengths when compared to the corresponding noncharged sample.

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Characterization of precipitates in a 7.9Cr–1.65Mo–1.25Si–1.2V steel during tempering

Cited by 28 publications

References 14 publications

9-12Cr Heat-Resistant Steels

9-12Cr Heat-Resistant Steels

The Influence of Holding Time on the Microstructure and Mechanical Properties of a 58CrMnSiNiMo Wear‐Resistant Cast Steel during Diffusion Annealing

EFEITO DO HIDROGÊNIO NO AÇO 2,25Cr-1Mo-0,25V ENVELHECIDO EM DIFERENTES CONDIÇÕES.

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