Contribution à l'étude de la forme des courbes de traction des métaux et à son interprétation physique

Crussard, C.; Jaoul, B.

doi:10.1051/metal/195047080589

Cited by 86 publications

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“…The different stages of work hardening may clearly be distinguished from the Crussard-Jaoul (C-J) plots, [19] the plot of h (dr/de p ) vs e p (Figure 4). It may be seen that there are three distinct regions for all the conditions and there is obvious change in the trend of h vs e p .…”

Section: Work-hardening Behaviormentioning

confidence: 99%

Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718

Kumar

Sastry

Singh

2007

Metall Mater Trans A

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Flow behavior of many metals and alloys in the region of uniform plastic strain is normally expressed by the simple power law relationship (r = Ke p n ). However, deviations have been observed from such behavior in several fcc metallic materials with low stacking fault energy. The age-hardenable nickel-iron base superalloy IN718 is also observed not to obey the simple power law relationship either in the solution treated as well as in the different age-hardened conditions. Various flow relationships were used to obtain the best fit for the experimental data, and different relationships were identified for the different heat-treated conditions. Detailed transmission electron microscopy (TEM) examination of the tensile-tested samples, interrupted after different amounts of strain, revealed inhomogeneous deformation by planar slip in all the heattreated conditions. Cold rolling, however, was found effective in eliminating the unusual plastic flow behavior, observed in the as-heat-treated conditions.

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Section: Work-hardening Behaviormentioning

confidence: 99%

Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718

Kumar

Sastry

Singh

2007

Metall Mater Trans A

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“…The objective of this paper is, therefore, to understand the strain hardening behaviour and associated substructural changes during tensile deformation of the alloy at ambient temperature in solution treated as well as aged conditions. Strain hardening behaviour of alloys is frequently analysed using Crussard and Jaoul analysis, 2,8 i.e. either ds/de (5 h) versus e or ds/de (5 h) versus s plots.…”

Section: Introductionmentioning

confidence: 99%

Strain hardening behaviour of an Fe–Ni–Cr–Al alloy

Satyanarayana¹,

Prasad²,

Malakondaiah³

et al. 2007

Materials Science and Technology

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Strain hardening behaviour of Fe-Ni-Cr-Al alloys, in both solution treated and aged conditions, has been investigated at ambient temperature. The alloy in both solution treated and aged conditions exhibits three fairly distinct stages of strain hardening. The strain hardening rate decreases in regime I, remains constant in regime II and begins to fall again in regime III. The three regimes shift to lower strain levels upon ageing and then shift to higher strain levels with over-ageing. While interaction of slip and deformation twinning is responsible for the constant strain hardening rate in solution treated specimens, dislocation-dislocation interaction (forest interaction) leading to the formation of dislocation tangled networks contributes to such a behaviour in aged specimens. Although the precipitate size effects on work hardening behaviour are clearly discernible for both h versus s and h d s d versus s d plots, as compared to h versus e plots, the hybrid model (h d s d versus s d plots) provides a quantitative description of precipitate size effects on the work hardening behaviour of the alloy in aged conditions.

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“…The Differential Crussard-Jaoul Analysis bility and accuracy are limited by the composition ranges and the microstructural measurements. Additionally, limited The Crussard-Jaoul (C-J) analysis [17,18,19] of the tensile stress-strain curves has been applied to many kinds of alloys, information in the stress-strain curves has been considered, and meaningful results have been obtained by Krauss and coe.g., yield stress, ultimate tensile strength, and elongation.…”

Section: Introductionmentioning

confidence: 99%

Tensile stress-strain analysis of single-structure steels

Umemoto

Tsuchiya

Liu

et al. 2000

Metall Mater Trans A

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In an effort to establish a universal model to predict the mechanical properties from processing conditions, tensile tests have been conducted of four single-structure steels, namely, ferrite, pearlite, bainite, and martensite; the data obtained were analyzed in terms of the Ludwik, Hollomon, and Swift equations to characterize their work-hardening behavior. It was found that the differential Crussard-Jaoul (C-J) analysis, based on the Ludwik equation, can describe the work-hardening behavior of these steels fairly well.The differential C-J analysis has shown that the ferrite and pearlite steels deform with two stages of work hardening, each stage associated with a distinctive value of the work-hardening exponent n. Martensitic steels exhibit single-stage work hardening. In bainite, the behavior was found to be dependent on transformation temperature; upper and lower bainite exhibit a behavior similar to pearlitic steels and quenched martensite, respectively. This can be well understood in terms of the similarity of the corresponding microstructures.On the basis of these results, the work-hardening behavior of single-structure steels falls into four categories, according to the n value. This classification may serve as a useful guide to predict the flow behavior of steels with a known microstructure or to judge the microstructure merely by stressstrain curves, without microstructural observations.

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Contribution à l'étude de la forme des courbes de traction des métaux et à son interprétation physique

Cited by 86 publications

References 0 publications

Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718

Work-Hardening Behavior of the Ni-Fe Based Superalloy IN718

Strain hardening behaviour of an Fe–Ni–Cr–Al alloy

Tensile stress-strain analysis of single-structure steels

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