Room temperature tensile properties of Fe-19wt.%Cr alloys precipitation hardened by the intermetallic compound NiAl

Taillard, Roland; Pineau, A.

doi:10.1016/0025-5416(82)90097-0

Cited by 60 publications

(34 citation statements)

References 30 publications

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“…In those conditions, the volume fraction of ␤ precipitates is the maximum one: [6] The strengthening mechanisms resulting from the presence of precipitates in a metallic matrix are related to the interactions between precipitates and dislocations through the presence of coherency stress, [12] or by the effect of different elastic moduli, [13] or even due to the shearing of ordered particles. [14,15] In the present case of ␤-NiAl precipitates in the martensite, those mechanisms are likely to operate simultaneously. In any case, the hardening resulting from those mechanisms depends on the (square root of) volume fraction and on the radius of precipitates.…”

Section: A Role Of Aluminum Contentmentioning

confidence: 98%

“…[15]: [16] Combining this last equation and Eq. [14] for the temperature T DBTT , one obtains a relation between the roomtemperature yield stress y and the transition temperature T DBTT : 9-Agreement between the experimental and calculated room-temperature elastic limit; the calculated values are obtained using Eq. [10] and the fitting coefficients are determined individually on each specimen batch (Table III).…”

Section: Prediction Of the Dbttmentioning

confidence: 99%

“…At this point, the alloy can sustain some plastic deformation before rupture. The transition, the DBTT, would thus occur for the temperature T DBTT at which the yield stress equals the critical cleavage stress: [14] The evolution with temperature of yield stress is commonly described for steels using the Zener and Hollomon formalism. [20] We have verified that the alloys follow the relation of Sellars and Tegart, [21] which for the case of high stresses can be written as [15] For a given geometry and strain rate, the ratio between y (T), the yield stress at temperature T, and the room-temperature yield stress, y , depends only on T and the constant b from Eq.…”

Section: Prediction Of the Dbttmentioning

confidence: 99%

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Effect of the metallurgical variables on the yield stress of PH 13-08 steel

Cloué¹,

Viguier

Andrieu

2005

Metall Mater Trans A

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The mechanical properties of different casts of the steel PH 13-08 Mo are examined as a function of different metallurgical parameters. The predominant role of aluminum content as well as the heattreatment conditions is highlighted. From a microstructural point of view, the macroscopic properties are governed by the amount of ␤-NiAl precipitation and the reverted austenite. These parameters are used in order to calculate the yield strength at room temperature of the different alloys of the study. The calculation has been extended to predict the ductile-brittle transition temperature (DBTT).

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Section: A Role Of Aluminum Contentmentioning

confidence: 98%

Section: Prediction Of the Dbttmentioning

confidence: 99%

Section: Prediction Of the Dbttmentioning

confidence: 99%

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Effect of the metallurgical variables on the yield stress of PH 13-08 steel

Cloué¹,

Viguier

Andrieu

2005

Metall Mater Trans A

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“…Application of this theory to interpret hardness/strength data achieves fairly satisfactory agreement with experimental results. 45,46) Some attempts were made to calculate the diffusion coefficient, which is within the constant c. However, the calculated diffusion values are usually much faster than the lattice diffusion coefficient extrapolated from high temperature diffusion data. For instance, based on the particle-size measurement in a Ni-11.46Si (at%) system, 47) Ardell estimated the values of diffusion coefficient to be 10 times greater than the values extrapolated from hightemperature diffusivities.…”

Section: Mechanism Of Particle Coarseningmentioning

confidence: 99%

Quantification of Precipitation Hardening and Evolution of Precipitates

2002

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Quantification of precipitation hardening is a challenging subject as it demands combined knowledge of precipitation strengthening mechanism and precipitate growth/coarsening kinetics. Having not seen many attempts on developing new theories in recent years, the authors are aware of the fact that many existing concepts and developed theories are sometimes even neglected or misused. This article therefore aims to describe overview on some aspects which have not been fully addressed and/or misused. Recent developments in this subject include an accurate determination of the equilibrium precipitate fraction and interparticle spacing. The influence from precipitation fraction on precipitate coarsening and hardening kinetics was accounted for quantitatively, which allows the hardening quantification to be carried out in a more accurate manner. In addition, difficulties in quantification of precipitation strengthening effects in commercial systems are discussed. Advanced theories on dislocation precipitate interaction mechanisms are required to improve the accuracy in quantification of precipitation hardening to a high level.

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“…[4][5][6][7][8] On the other hand, there have been few reports on the application of precipitation-hardened stainless steel as a soft magnetic material. Recently, a precipitation-hardened softmagnetic stainless steel containing alloying elements Ni, Al, and Mo has been developed, and it exhibits high hardness (typical Vickers hardness of 370 Hv) with excellent softmagnetic properties as well as corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Small-angle X-ray Scattering Studies on Aging Precipitation of High-strength Soft-magnetic Stainless Steels

et al. 2017

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We investigated the effect of alloying elements Ni, Al, and Mo on the mechanical properties of precipitation-hardened soft-magnetic stainless steels, whose aging condition and chemical composition were varied. Thermodynamic calculations suggested that the aging treatments led to precipitation of a β-NiAl compound with B2 structure and Fe 2 Mo-type Laves phases. Although coarse precipitates, which are less effective for precipitation hardening, were observed in bright-field images obtained by transmission electron microscopy (TEM), the B2-type precipitates were detected in TEM electron diffraction patterns. By changing the concentration of the alloying elements, the B2-type β-NiAl precipitates were mainly responsible for the precipitation hardening, and the Vickers hardness was hardly affected by the Mo content. Small-angle X-ray scattering analysis was used to determine the size and number density of the fine β-NiAl precipitates, which contributed to the hardening. The high-density β-NiAl precipitates grew to a few nanometers in radius after an adequate period of aging, suggesting that the β-NiAl precipitates were responsible for the precipitation-hardening characteristics. On the other hand, the size of the precipitates was less affected by the amounts of Ni and Al, and the number density decreased with decreasing Ni and Al content. The improvement in hardness resulting from the β-NiAl precipitates had a linear relationship with the square root of the product of the precipitate size and number density.

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Room temperature tensile properties of Fe-19wt.%Cr alloys precipitation hardened by the intermetallic compound NiAl

Cited by 60 publications

References 30 publications

Effect of the metallurgical variables on the yield stress of PH 13-08 steel

Effect of the metallurgical variables on the yield stress of PH 13-08 steel

Quantification of Precipitation Hardening and Evolution of Precipitates

Small-angle X-ray Scattering Studies on Aging Precipitation of High-strength Soft-magnetic Stainless Steels

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