Precipitation Strengthening at Elevated Temperature in Fe-Cu Alloys

Nakashima, Kouichi; Futamura, Yuichi; Tsuchiyama, Toshihiro; Takaki, Setsuo

doi:10.2355/tetsutohagane1955.89.5_524

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…where G is the shear modulus of matrix, b is the Burgers vector, λ isthemeanparticlespacing,θ is the bowing angle between the dislocation and the straight line that connects two particles, and β is a constant composed of Taylor's factor and the coefficient of shear stress, for which the value is approximately 3.2 [14]. The values of λ in steels D and E were measured by TEM observation to be 20 nm and 10 nm, respectively.…”

Section: Dominant Dislocation-bypass Mechanismmentioning

confidence: 99%

Mechanisms of Significant Precipitation Hardening in a Medium Carbon Bainitic Steel by Complex Nanocarbides Composed of Nb, Ti and V

Okonogi¹,

Hara²,

Miura³

2018

New Uses of Micro and Nanomaterials

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Precipitation-hardening behavior of various medium carbon bainitic steels with added elements of Nb, Ti and V was systematically investigated. Complex nanocarbides composed of Nb, Ti and V precipitated after aging in the steel with multiple additions of all the elements, whereas those with added individual elements were simple MC types. The amount of precipitation hardening (ΔHv) after aging at 873 K of the former steel was approximately 90 ΔHv, while those of the latter were less than 40 ΔHv at best. Therefore, significant precipitation hardening took place by multiple element addition. The different amount of precipitation hardening depending on added elements was reasonably understood by considering misfit parameters between carbides and ferrite matrix.

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Section: Dominant Dislocation-bypass Mechanismmentioning

confidence: 99%

Mechanisms of Significant Precipitation Hardening in a Medium Carbon Bainitic Steel by Complex Nanocarbides Composed of Nb, Ti and V

Okonogi¹,

Hara²,

Miura³

2018

New Uses of Micro and Nanomaterials

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“…15) Furthermore, the interaction between the dislocation and the Cu particles at high temperatures (~873 K) should be different from that at the room temperature, and are based on the Srolovitz mechanisms. 16) Nevertheless, the mechanisms were only investigated from the still images taken after the tensile experiment, and insitu experiments had always been desired.…”

Section: )mentioning

confidence: 99%

<i>In-situ</i> TEM Observation of the Interaction between Dislocations and Particles of Cu-added Ferritic Stainless Steel under High-temperature Straining

et al. 2016

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Cu is always present in the matrix when ferritic steels were prepared from ferrous scrap. When the ferritic steels are aged thermally, Cu particles start appearing and dispersing finely and homogeneously, which may result the steels strengthened by dispersion strengthening. In this study, the interactions between Cu particles and dislocations were examined via high-temperature in-situ TEM straining. Cu-added ferritic stainless steel (Fe-18.4%Cr-1.5%Cu) was used in the present study. Specimen was aged at 1 073 K for 360 ks. Microstructure of specimen was analyzed by JEM-3200FSK and high-temperature in-situ TEM straining was conducted using JEM-1300NEF. Progressing dislocations in matrix contacted with the Cu particle at right angle. This result implies that there is an attractive interaction between dislocations and the Cu particle. Furthermore, dislocations pass through the particle after contacting it, so that the interaction with dislocations and particles should be explained by Srolovitz mechanism.

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“…[1][2][3][4] And, as well as a study about the Cu precipitation behavior, 5) its effects to the texture and formability have been reported. [6][7][8] According to the published phase diagrams of Fe-Cu binary system, the maximum solubility of copper in ferrite is 2.2 mass% at 850°C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb Addition on Cu Precipitation in Ferritic Stainless Steel

et al. 2011

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Formations of Cu-rich precipitate in 18%Cr-1.5%Cu stainless steels without and with 0.5%Nb have been examined mainly using transmission electron microscopy. The specimens solution-treated at 1250°C were isothermally transformed at various temperatures between 500 and 850°C. Fine spherical Cu-rich solute zones were nucleated in the steels in the beginning of aging. These Cu-rich zones exhibited bcc structure and then transformed into 9R structure with twins during aging. The spherical 9R-Cu particles changed into rod-shaped fcc-Cu particles after prolonged aging. Laves phase of Fe2Nb type started to form in the Nb-added steel almost after finishing nucleation and growth of Cu particles. Addition of Nb in the steel delayed the nucleation of the Cu-rich zones due to slow diffusion of Nb atoms in ferrite.

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Precipitation Strengthening at Elevated Temperature in Fe-Cu Alloys

Cited by 11 publications

References 13 publications

Mechanisms of Significant Precipitation Hardening in a Medium Carbon Bainitic Steel by Complex Nanocarbides Composed of Nb, Ti and V

Mechanisms of Significant Precipitation Hardening in a Medium Carbon Bainitic Steel by Complex Nanocarbides Composed of Nb, Ti and V

<i>In-situ</i> TEM Observation of the Interaction between Dislocations and Particles of Cu-added Ferritic Stainless Steel under High-temperature Straining

Effect of Nb Addition on Cu Precipitation in Ferritic Stainless Steel

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