Influence of nanoparticle reinforcements on the strengthening mechanisms of an ultrafine-grained dual phase steel containing titanium

Kang, Yonglin; Han, Qihang; Zhao, Xian-meng; Cai, Minghui

doi:10.1016/j.matdes.2012.07.068

Cited by 92 publications

(25 citation statements)

References 31 publications

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“…16,24) This is a feature in twophase materials which results from the strain gradient between the constituent phases with different deformation behaviours. The geometrically necessary dislocations (GNDs) are required to accommodate this strain gradient and to allow compatible deformation of constituent phases.…”

Section: )mentioning

confidence: 99%

“…Mao et al 35) reported the lattice friction stress for the hot rolled Timicroalloyed steel at about 48 MPa. As it is difficult to measure the dislocation width accurately, and the width of edge dislocation is similar among AHSS, Kang et al 24) used similar value (48 MPa) in their calculations. However, this equation is not for the poly crystal with the slip of screw dislocations.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

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Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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Dual phase (DP) steels have been investigated using a new approach utilizing simple cold-rolling and subsequent intercritical annealing of a martensite-ferrite duplex starting structure. The ferrite grain size and volume fraction of martensite were varied by changing the rolling reduction and intercritical annealing time. Ultrafine grained DP (UFG-DP) steel with an average grain size of about 2 μm was achieved by short intercritical annealing of the 80% cold-rolled duplex microstructure. Tensile testing revealed superior mechanical properties (the ultimate tensile strength of 1 100 MPa and elongation of 13%) for the new DP steel in comparison with the commercially used high strength DP980 steel. The variations in hardness, strength and elongation of the specimens with rolling reduction and intercritical holding time were correlated to microstructural characterizations. The inherent mechanism for strengthening of the DP steel was discussed and the contribution of each strengthening factor was quantitatively calculated. The results showed that the calculated yield strength (430.6 MPa) is very close to the measured value (422 MPa).

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Section: )mentioning

confidence: 99%

Section: Strengthening Mechanismsmentioning

confidence: 99%

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

2015

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“…Carbides, borides, nitrides and oxides nano-particles are usually used as modifiers in order to both improve a mictrostructure of actually existed cast materials as well as to create a new materials design [1][2]6,[10][11]. In practice, the choice of modifiers is related to economic reasons and ease of performing the procedure modification.…”

Section: Introductionmentioning

confidence: 99%

“…The modification with nano and micron-sized particles has been already successfully performed in e.g. cast iron and steels [1,10], Al alloys [3] or Mg alloys [6]. In recent years intermetallic based alloys from transition metals -aluminum binary systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

Łazińska¹,

Durejko²,

Polkowski³

2017

Archives of Metallurgy and Materials

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Results of the first principle study on a fabrication of FeAl intermetallic based alloy with an addition of nanometric αAl 2 O 3 (n-Al 2 O 3 ) particles by the LENS method and a subsequent characterization of the as received materials' structure and properties, are shown in the present work. A series of samples were manufactured using LENS technique while a control of temperature and the size of melted metal pool.The presence of ceramics nanoparticles was not directly confirmed by microscopy observations. Neither aluminum nor oxygen content was not elevated in the material with n-Al 2 O 3 content. Although, indirect methods revealed influence of n-Al 2 O 3 addition on the manufactured elements structure. Analyses of porosity has shown that addition of 2% vol. n-Al 2 O 3 significantly decreases this feature (~1%), as compared to the reference material made of pure FeAl intermetallic alloy (~5%). The addition of n-Al 2 O 3 causes an increase of grain size in Fe40Al intermetallic alloy. An oxidation resistance has been also improved what was associated to the n-Al 2 O 3 addition. Four times lower increase of samples mass was noticed for sample with the n-Al 2 O 3 addition as compared to the pure Fe40Al intermetallic alloy.

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“…Os autores apontam que a martensita afeta a ferrita devido às discordâncias introduzidas nessa estrutura vizinha às ilhas de martensita, como resultado de deformações plásticas associadas à expansão volumétrica da transformação martensítica [13,14]. As discordâncias são requeridas para acomodar este gradiente e para permitir a deformação compatível nas duas fases [15,16]. Considerando os efeitos da direção de laminação prévia aos tratamentos térmicos no comportamento do material, verifica-se que, em geral, apesar de uma pequena superioridade nos valores referentes ao estudo na direção transversal, não foram evidenciadas diferenças significativas entre as direções estudadas.…”

Section: Resultsunclassified

Influência Da Temperatura Intercrítica Na Microestrutura E Nas Propriedades Mecânicas De Um Aço Bifásico

Magalhães¹,

Martins²,

Pinto³

et al. 2018

ABM Proceedings

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6Elaine Carballo Siqueira Corrêa 7 Resumo Nas últimas décadas a crescente demanda por carros mais seguros, econômicos e menos poluentes exigiram das montadoras, siderúrgicas e comunidade científica investimentos na pesquisa e no desenvolvimento de novos materiais, tais como os aços avançados de alta resistência. Dentro deste contexto, neste trabalho foi realizada a análise da microestrutura e das propriedades mecânicas de um aço bifásico na condição inicial e submetido a tratamentos térmicos com aquecimento na região intercrítica e resfriamento brusco. Foram analisadas a proporção dos constituintes na microestrutura e as propriedades mecânicas por meio de microscopia óptica e eletrônica de varredura, de difração de raios X, dureza e de tração. Observou-se, em geral, que o aumento da temperatura intercrítica levou a uma elevação da fração de martensita e, consequentemente, influenciou de forma a aumentar os valores de dureza, resistência mecânica e diminuir a ductilidade. Palavras-chave: Aço bifásico; Tratamento intercrítico; Microestrutura; Propriedades. INFLUENCE OF INTERCRITICAL TEMPERATURE IN THE MICROSTRUCTURE AND THE MECHANICAL PROPERTIES OF A DUAL PHASE STEEL AbstractIn recent decades the increasing demand for safer, economical and less polluting cars demanded of automakers, steelmakers and scientific community investments in research and development of new steels, such as advanced high strength steels. The aim of this work was the analysis of the microstructure and the mechanical behavior of a dual phase steel, in the initial condition and subjected to thermal processing with intercritical heating and quenching. The ferrite-martensite fraction in the material was evaluated by optical and scanning electron microscopy techniques and its influence in the mechanical properties was analyzed through hardness and tensile tests. It was observed that the increase of the intercritical temperature raised the fraction of martensite and thus led to an increase in hardness, yield strength and ultimate tensile strength and to a decrease in the elongation.

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Influence of nanoparticle reinforcements on the strengthening mechanisms of an ultrafine-grained dual phase steel containing titanium

Cited by 92 publications

References 31 publications

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

Strengthening Mechanisms of Ultrafine Grained Dual Phase Steels Developed by New Thermomechanical Processing

The Effect of Nanometric α-Al2O3 Addition on Structure and Mechanical Properties of Feal Alloys Fabricated by Lens Technique

Influência Da Temperatura Intercrítica Na Microestrutura E Nas Propriedades Mecânicas De Um Aço Bifásico

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