Topology of grain deformation

Singh, S. B.; Bhadeshia, H. K. D. H.

doi:10.1179/026708398790301043

Cited by 10 publications

(7 citation statements)

References 1 publication

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“…The carbon concentration of NANOBAIN steel (Table 1) was mainly selected to decrease the B s temperature as much as possible and to make austenite stronger with the aim of obtaining extremely thin platelets of bainite. In the absence of precipitation at ferrite/austenite boundaries, the thickness of bainite plates depends primarily on the strength of the austenite at the transformation temperature, and the chemical free energy change accompanying transformation [27]. This applies specifically when the shape deformation causes plastic strain in the adjacent austenite.…”

Section: Resultsmentioning

confidence: 99%

New experimental evidence on the incomplete transformation phenomenon in steel

Caballero¹,

García‐Mateo²,

Santofimia³

et al. 2009

Acta Materialia

146

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Section: Resultsmentioning

confidence: 99%

New experimental evidence on the incomplete transformation phenomenon in steel

Caballero¹,

García‐Mateo²,

Santofimia³

et al. 2009

Acta Materialia

146

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“…Deformation leads to a large increase in the amount of austenite grain surface and grain edge per unit volume [18,[185][186][187][188][189][190][191]. This would lead to a corresponding large increase in the grain boundary nucleation rate of allotriomorphic ferrite.…”

Section: Role Of Thermomechanical Processingmentioning

confidence: 99%

Recent advances in friction-stir welding – Process, weldment structure and properties

Nandan

DebRoy

Bhadeshia

2008

Progress in Materials Science

1,808

911

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Friction stir welding is a refreshing approach to the joining of metals. Although originally intended for aluminium alloys, reach of FSW has now extended to a variety of materials including steels and polymers. This review deals with the fundamental understanding of the process and its metallurgical consequences. The focus is on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.

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“…The importance of grain topology in the evolution of grain structure during isothermal processing is well recognized in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Considering thermodynamic equilibrium, Smith [1] argued that a two-dimensional equilibrium grain structure must consist of six-sided grains.…”

Section: Introductionmentioning

confidence: 99%

Grain topology in Ti–6Al–4V welds—Monte Carlo simulation and experiments

Mishra¹,

DebRoy²

2004

J. Phys. D: Appl. Phys.

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The importance of topological features of grains in the evolution of grain structure is well recognized in isothermal systems. However, during fusion welding, strong spatial gradients of temperature exist in the heat-affected zone (HAZ), and this region undergoes rapid heating and cooling. The effects of spatial and temporal variations of temperature on the topological class distribution, relationship between size and topology of grains and the interdependence between grain topology and its neighbours are not known. Topological features of grains in the HAZ of Ti-6Al-4V alloy welds were measured for various heat inputs in the range 0.55-4.33 MJ m −1. The topological class distributions were also calculated using a three-dimensional Monte Carlo model utilizing thermal cycles computed from a well tested numerical heat transfer and fluid flow model. The computed results showed that the topological class distributions were unaffected by the spatial and temporal variations of temperature. Experimental investigations of a few sections confirmed the simulation results. The average grain size for each edge class varied linearly with the edge class number. The local topological environment, i.e. the average number of sides of neighbours, n n , varied linearly with the inverse of the number of sides of grains, 1/n r , at a given location in the HAZ. Locations with the same topological environment showed the same grain size, indicating the significant influence of grain topology on grain growth in the HAZ.

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Topology of grain deformation

Cited by 10 publications

References 1 publication

New experimental evidence on the incomplete transformation phenomenon in steel

New experimental evidence on the incomplete transformation phenomenon in steel

Recent advances in friction-stir welding – Process, weldment structure and properties

Grain topology in Ti–6Al–4V welds—Monte Carlo simulation and experiments

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