Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082

Zeng Gao; Jianguang Feng; Zhenjiang Wang; Jitai T. Niu; Christof Sommitsch

doi:10.3390/met9060672

Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082

Zeng Gao, Jianguang Feng, Zhenjiang Wang, Jitai T. Niu, Christof Sommitsch

Institute of Materials Science, Joining and Forming (3030)

Research output: Contribution to journal › Article › peer-review

Abstract

This work mainly focuses on a series of microstructural analysis and predictions regarding
dynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,
this study includes the shape prediction of the stir zone formed during friction stir spot welding.
Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in the
stir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocation
density is established and implemented in DEFORM-3D software to predict dynamic recrystallization
during friction stir spot welding of AA6082. From the experimental and model predictions, it is
observed that the original microstructure in the stir zone is completely replaced by a recrystallized
fine grained microstructure. There is satisfactory agreement between the experimental grain size
and the simulated results. In addition, the predicted shape of the stir zone fits quite well with the
experimental shape as well.

Original language	English
Article number	672
Journal	Metals
Volume	9
Issue number	6
DOIs	https://doi.org/10.3390/met9060672
Publication status	Published - 2019

ASJC Scopus subject areas

General Materials Science

Fields of Expertise

Advanced Materials Science

Access to Document

10.3390/met9060672Licence: CC BY 4.0

Cite this

@article{fdee1e624995466ebfbdfca9b1a651ad,

title = "Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082",

abstract = "This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.",

keywords = "friction stir spot welding; dynamic recrystallization; microstructure evolution; aluminum alloy",

author = "Zeng Gao and Jianguang Feng and Zhenjiang Wang and Niu, {Jitai T.} and Christof Sommitsch",

year = "2019",

doi = "10.3390/met9060672",

language = "English",

volume = "9",

journal = "Metals",

issn = "2075-4701",

publisher = "MDPI AG",

number = "6",

}

TY - JOUR

T1 - Dislocation Density-Based Modeling of Dynamic Recrystallized Microstructure and Process in Friction Stir Spot Welding of AA6082

AU - Gao, Zeng

AU - Feng, Jianguang

AU - Wang, Zhenjiang

AU - Niu, Jitai T.

AU - Sommitsch, Christof

PY - 2019

Y1 - 2019

N2 - This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.

AB - This work mainly focuses on a series of microstructural analysis and predictions regardingdynamic recrystallization behavior, change in grain size, and dislocation density. Additionally,this study includes the shape prediction of the stir zone formed during friction stir spot welding.Microstructure analysis of the joint reveals that the mechanism of dynamic recrystallization in thestir zone is geometric dynamic recrystallization. A set of constitutive equations based on dislocationdensity is established and implemented in DEFORM-3D software to predict dynamic recrystallizationduring friction stir spot welding of AA6082. From the experimental and model predictions, it isobserved that the original microstructure in the stir zone is completely replaced by a recrystallizedfine grained microstructure. There is satisfactory agreement between the experimental grain sizeand the simulated results. In addition, the predicted shape of the stir zone fits quite well with theexperimental shape as well.

KW - friction stir spot welding; dynamic recrystallization; microstructure evolution; aluminum alloy

U2 - 10.3390/met9060672

DO - 10.3390/met9060672

M3 - Article

SN - 2075-4701

VL - 9

JO - Metals

JF - Metals

IS - 6

M1 - 672

ER -