Grain size effects in the deformation of polycrystalline iron

Jago, R. A.; Hansen, Niels

doi:10.1016/0001-6160(86)90118-5

Cited by 64 publications

(40 citation statements)

References 16 publications

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“…Therefore, the lattice friction stress was set to a constant value of 50 MPa in the present study which is experimentally evaluated in the poly crystalline pure iron at room temperature. 38) The solid solution hardening can be expressed as follows: 39) ... (9) Therefore, the solid solution strengthening for ferrite is 201.3 MPa.…”

Section: Strengthening Mechanismsmentioning

confidence: 99%

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: Strengthening Mechanismsmentioning

confidence: 99%

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

2015

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“…The strong drawing deformations are possess a γ fiber texture {111}<uvw>, favourable to deep drawability [20][21][22]. In the present study, the distribution of stresses will be also heterogeneous [1][2][3] Figure 3 shows the local orientation characterization around the crack. We can note the existence of a fiber texture {111}<uvw >, with a variation from <110> to <112> for <uvw > orientation.…”

Section: Figurementioning

confidence: 79%

“…The EBSD technique (Electron Back Scattering Diffraction) allows the correlation between the microstructure characteristics and the distribution of plastic deformation and stresses EBSD is presently used predominantly in nearly all metallurgy research approaches and has become a common technique used in the characterization of polycrystalline materials the method has become increasingly useful in the analysis of grain size and distribution, grain boundary disorientations and texture analysis of materials. The EBSD technique makes it possible to observations [1][2][3].Crack propagation and stops is an important topic in the formability field [4][5][6]. It is to consider the combination of "micro and macro" effects [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of transgranular crack propagation by EBSD in a soft steel

Boumaiza

Rouag

Baudin

et al. 2010

J. Phys.: Conf. Ser.

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This study is concerned with crack propagation in a soft steel sheet during drawing. The drawability is considered in relation with the structural anisotropy. Most existing studies on crack propagation are based on the global mechanical properties. However, microstructural inhomogeneity can lead to micro-crack formation. Micro-texture can affect crack propagation and stops in soft steel during drawing. The EBSD technique is used to show that the adjustment of the grain orientation from the initial recrystallization component {111}<112> towards the deformation orientation {111}<110 > incites a trans-granular crack inside a {111}<112> grain in a globally ductile material.

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“…4,5) The microstructural evolution during cold rolling has been studied extensively in fcc metals such as Al, 6) Ni 7) and Cu 8) and to a lesser extent in bcc metals such as iron and steel. 9,10) At small strains a cell block structure forms, as shown in Fig. 1(a) for high purity Al (99.99 %) 11) and in Fig.…”

Section: A Universal Pattern Of Structural Evolutionmentioning

confidence: 84%