Dislocation-based plasticity and strengthening mechanisms in sub-20 nm lamellar structures in pearlitic steel wire

Zhang, Xiaodan; Hansen, Niels; Godfrey, A.; Huang, Xiaoxu

doi:10.1016/j.actamat.2016.04.040

Cited by 125 publications

(95 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A further reduction in the structural scale down to or below ~10 nm requires an optimization of thermomechanical treatments and structural parameters. Example systems where such a scale may be reached include pearlitic steel wires [9,11,[20][21][22][23][24][25], Cu alloyed with Fe [26] and Ni alloyed with Mo [27]. An extension of the present research will require a validation of the calculated stress profiles on an extremely fine scale together with mechanical testing at high spatial resolution, for example, in-situ TEM testing [28] and nano-indentation.…”

Section: Discussionmentioning

confidence: 99%

Local microstructure and flow stress in deformed metals

Zhang

Hansen²,

Nielsen³

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

About quantitative EBSD analysis of deformation and recovery substructures in pure Tantalum C Moussa, M Bernacki, R Besnard et al. Abstract. The microstructure and flow stress of metals are related through many well-known strength-structure relationships based on structural parameters, where grain size and dislocation density are examples. In heterogeneous structures, the local stress and strain are important as they will affect the bulk properties. A microstructural method is presented which allows the local stress in a deformed metal to be estimated based on microstructural parameters determined by an EBSD analysis. These parameters are the average spacing of deformation introduced boundaries and the fraction of high angle boundaries. The method is demonstrated for two heterogeneous structures: (i) a gradient (sub)surface structure in steel deformed by shot peening; (ii) a heterogeneous structure introduced by friction between a tool and a workpiece of aluminum. Flow stress data are calculated based on the microstructural analysis, and validated by hardness measurement and 2D numerical simulations. A good agreement is found over a plastic strain range from ~1 to 5.

show abstract

Section: Discussionmentioning

confidence: 99%

Local microstructure and flow stress in deformed metals

Zhang

Hansen²,

Nielsen³

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…In this part, 19 publications and one unpublished doctoral dissertation were examined [3,15,[30][31][32][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. From their graphical data, values of tensile strength σ ts and of drawing strain e (or diameter d) were obtained.…”

Section: Size Effects Of Pearlitic Steelsmentioning

confidence: 99%

“…This was based on the ferrite and cementite strength as the base strength. Since then, more possible strengthening mechanisms have been proposed and reviewed [3,35,50]. Some critical issues, like the deformation and fracture of cementite, have been studied further.…”

Section: Strength Partitionmentioning

confidence: 99%

“…Further given are data from Langford [32] (in blue +), Tarui [49] (in green point), Zhang et al [40,50] (in red and green X), Li et al [3] (in green triangles), and Takahashi et al [29] (in red triangle). Most studies [3,30,32,40,49,50,75], used TEM, while SEM [49], two-surface replica method [34], and atom probe microscope [3,29] were also used. Figure 7a shows the tensile strength versus pearlite spacing from various studies using only the data from direct determination.…”

Section: Pearlite Spacingsmentioning

confidence: 99%

“…In the case of Embury's data [30] used in Figure 7, the two finest ferrite spacing values were read from their TEM results. Ferrite spacings are around 90% of the corresponding pearlite spacing and this should be used for strength calculations [49,50]. Among the published studies, Langford [32] conducted most comprehensive TEM examination using 15 drawn wire samples.…”

Section: Pearlite Spacingsmentioning

confidence: 99%

See 2 more Smart Citations

Size Effects of High Strength Steel Wires

Ono

2019

Metals

View full text Add to dashboard Cite

This study examines the effects of size on the strength of materials, especially on high strength pearlitic steel wires. These wires play a central role in many long span suspension bridges and their design, construction, and maintenance are important for global public safety. In particular, two relationships have been considered to represent strength variation with respect to length parameters: (i) the strength versus inverse square-root and (ii) inverse length equations. In this study, existing data for the strength of high strength pearlitic steel wires is evaluated for the coefficient of determination (R2 values). It is concluded that the data fits into two equations equally well. Thus, the choice between two groups of theories that predict respective relationships must rely on the merit of theoretical developments and assumptions made.

show abstract

Effect of Carbon in Severe Plastically Deformed Metals

2020

View full text Add to dashboard Cite

In the last decades severe plastic deformation techniques have gained increasing interest as they allow the production of bulk nanostructured materials with superior mechanical and functional properties. However, because of mechanically induced grain boundary migration, the achievable grain size reduction is not indefinite but tends to stagnate once sufficient strain has been applied. Consequently, addition of solute elements or second phase particles offers the possibility to access the true nanocrystalline regime. Due to their low solubility and high mobility, interstitial elements are extremely effective at subduing boundary migration. Herein the effect of carbon on grain refinement and the resulting mechanical properties are summarized. As carbon may not only be added as graphite but could also be introduced in other forms or as allotropes such as nanotubes, nanodiamonds, or carbides, the respective advantages and problems associated with it are the center of discussion. Independent of the strategy used, strength levels hardly achievable with other alloying elements can be obtained. Moreover, as carbon does not have a negative effect on grain boundary cohesion, despite the enormous strength levels even ductility and toughness can be widely maintained.

show abstract

Dislocation-based plasticity and strengthening mechanisms in sub-20 nm lamellar structures in pearlitic steel wire

Cited by 125 publications

References 31 publications

Local microstructure and flow stress in deformed metals

Local microstructure and flow stress in deformed metals

Size Effects of High Strength Steel Wires

Effect of Carbon in Severe Plastically Deformed Metals

Contact Info

Product

Resources

About