A Significant Method for Estimation of the Grain Size of Polycrystalline Materials

Takayama, Yoshihisa; Furushiro, Norio; Tozawa, Tatsumi; Kato, Hidemi; Hori, Shigenori

doi:10.2320/matertrans1989.32.214

Cited by 35 publications

(19 citation statements)

References 26 publications

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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

1,822

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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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

1,822

911

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“…[12] In the literature, various works using the MLI method to measure the size of grains have been proposed. [12][13][14][15][16][17][18][19][20] Willis and Lake [13] used the circle intercept method, and they concluded that the use of different measurement techniques in different laboratories results in significant variations in measured grain diameter and grain size distribution. Furthermore, Karlsson and Gokhale [20] proposed a method for estimating the MLI length of anisotropic structures using vertical sections and trisector methods.…”

Section: The MLI Methodsmentioning

confidence: 99%

“…[1,3,4] The main objective of this article is to unambiguously estimate the width or spacing between these homogeneous regions. To this effect, we employed two different methods: a modified version of the mean linear intercept (MLI) method [12][13][14][15][16][17][18][19][20] and an image analysis method based on spatial autocorrelations. [21][22][23][24][25] …”

Section: An Urgent Need Exists To Develop Quantitativementioning

confidence: 99%

Macroregion Size Measurements in Bimodal Titanium Forgings Using Two-Dimensional Autocorrelation Method

Toubal

Bocher

Moreau

et al. 2010

Metall Mater Trans A

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“…Takayama et al 25) calculated the value of r m in this equation to be expðÀ3' 2 =2Þ, for an array of tetrakaidecahedra.…”

Section: Log-normal Functionmentioning

confidence: 99%

Kinetics of Normal Grain Growth Depending on the Size Distribution of Small Grains

2003

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A theoretical relationship is derived between the kinetics of normal grain growth and the size distribution of small grains. When the distribution of the normalized grain size r is proportional to r m around r ¼ 0 in a steady state, the grain growth exponent n is revealed to be m þ 1. The same relationship is also derived from the analysis of the mean field model for particle growth. The validity of this relationship is confirmed from the consistence with existing grain-growth models and numerical simulations. Experimental consistence is observed for the size distribution on sectional surface. It is found that a log-normal function is not a steady-state size distribution for normal grain growth with n ¼ 2, even though it may approximate experimental size distributions. The obtained relationship is also shown to be applicable to particle coarsening by Ostwald-ripening.

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A Significant Method for Estimation of the Grain Size of Polycrystalline Materials

Cited by 35 publications

References 26 publications

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

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

Macroregion Size Measurements in Bimodal Titanium Forgings Using Two-Dimensional Autocorrelation Method

Kinetics of Normal Grain Growth Depending on the Size Distribution of Small Grains

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