Local microstructure and flow stress in deformed metals

Xiaodan Zhang; Niels Hansen; Chris Valentin Nielsen

doi:10.1088/1757-899X/219/1/012053

Local microstructure and flow stress in deformed metals

Xiaodan Zhang, Niels Hansen, Chris Valentin Nielsen

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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.

Original language	English
Article number	012053
Journal	I O P Conference Series: Materials Science and Engineering
Volume	219
Number of pages	7
ISSN	1757-8981
DOIs	https://doi.org/10.1088/1757-899X/219/1/012053
Publication status	Published - 2017
Event	38th Risø International Symposium on Materials Science - Technical University of Denmark , Roskilde, Denmark Duration: 4 Sept 2017 → 8 Sept 2017

Conference

Conference	38th Risø International Symposium on Materials Science
Location	Technical University of Denmark
Country/Territory	Denmark
City	Roskilde
Period	04/09/2017 → 08/09/2017

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Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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title = "Local microstructure and flow stress in deformed metals",

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. ",

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AU - Zhang, Xiaodan

AU - Hansen, Niels

AU - Nielsen, Chris Valentin

N1 - Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

U2 - 10.1088/1757-899X/219/1/012053

DO - 10.1088/1757-899X/219/1/012053

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SN - 1757-8981

VL - 219

JO - I O P Conference Series: Materials Science and Engineering

JF - I O P Conference Series: Materials Science and Engineering

M1 - 012053

T2 - 38th Risø International Symposium on Materials Science

Y2 - 4 September 2017 through 8 September 2017

ER -

Local microstructure and flow stress in deformed metals

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