Fatigue assessment of friction stir welded DH36 steel

Athanasios Toumpis; Alexander Galloway; Helena Polezhayeva; Lars Molter

doi:10.1002/9781119093343.ch2

Fatigue assessment of friction stir welded DH36 steel

Athanasios Toumpis, Alexander Galloway, Helena Polezhayeva, Lars Molter

Mechanical And Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

2 Citations (Scopus)

58 Downloads (Pure)

Abstract

A fatigue performance assessment of 6mm thick friction stir welded DH36 steel has been undertaken, filling a significant knowledge gap in the process for steel. A comprehensive set of experimental procedures has been proposed; the consequent study extensively examined the weld microstructure, hardness, geometry and misalignments of the samples in support of the tensile and fatigue testing. The effect of varying weld parameters was also investigated. The typical fatigue performance of friction stir welded DH36 steel plates has been established, exhibiting considerably extended fatigue lives, well above 105 cycles at a stress range of 90% of yield strength, irrespective of minor instances of small surface breaking flaws which have been identified. An understanding of the way in which these flaws impact on the fatigue performance has been developed, concluding that surface breaking defects emanating from the friction stir tool’s shoulder marks on the weld top surface can act as the dominant factor for crack initiation under fatigue loading.

Original language	English
Title of host publication	Friction Stir Welding and Processing VIII
Editors	Rajiv S. Mishra, Murray W. Mahoney, Yakuta Sato, Yuri Hovanski
Place of Publication	New Jersey, USA
Pages	11-20
Number of pages	9
Volume	VIII
DOIs	https://doi.org/10.1002/9781119093343.ch2
Publication status	Published - 20 Feb 2015
Event	TMS Annual Meeting and Exhibition, TMS2015 - Florida, Orlando, United States Duration: 15 Mar 2015 → 19 Mar 2015

Conference

Conference	TMS Annual Meeting and Exhibition, TMS2015
Country/Territory	United States
City	Orlando
Period	15/03/15 → 19/03/15

Keywords

friction stir welding
low alloy steel
fatigue testing
fracture surface

Access to Document

10.1002/9781119093343.ch2

Toumpis-etal-Book-Frict-Stir-Welding-&-Processing-VIII-2015-Fatigue-assessment-of-friction-stir-welded-DH36-steelAccepted author manuscript, 640 KB

Cite this

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title = "Fatigue assessment of friction stir welded DH36 steel",

abstract = "A fatigue performance assessment of 6mm thick friction stir welded DH36 steel has been undertaken, filling a significant knowledge gap in the process for steel. A comprehensive set of experimental procedures has been proposed; the consequent study extensively examined the weld microstructure, hardness, geometry and misalignments of the samples in support of the tensile and fatigue testing. The effect of varying weld parameters was also investigated. The typical fatigue performance of friction stir welded DH36 steel plates has been established, exhibiting considerably extended fatigue lives, well above 105 cycles at a stress range of 90% of yield strength, irrespective of minor instances of small surface breaking flaws which have been identified. An understanding of the way in which these flaws impact on the fatigue performance has been developed, concluding that surface breaking defects emanating from the friction stir tool{\textquoteright}s shoulder marks on the weld top surface can act as the dominant factor for crack initiation under fatigue loading.",

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Fatigue assessment of friction stir welded DH36 steel. / Toumpis, Athanasios ; Galloway, Alexander; Polezhayeva, Helena et al.

Friction Stir Welding and Processing VIII. ed. / Rajiv S. Mishra; Murray W. Mahoney; Yakuta Sato; Yuri Hovanski. Vol. VIII New Jersey, USA, 2015. p. 11-20.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

TY - GEN

T1 - Fatigue assessment of friction stir welded DH36 steel

AU - Toumpis, Athanasios

AU - Galloway, Alexander

AU - Polezhayeva, Helena

AU - Molter, Lars

PY - 2015/2/20

Y1 - 2015/2/20

N2 - A fatigue performance assessment of 6mm thick friction stir welded DH36 steel has been undertaken, filling a significant knowledge gap in the process for steel. A comprehensive set of experimental procedures has been proposed; the consequent study extensively examined the weld microstructure, hardness, geometry and misalignments of the samples in support of the tensile and fatigue testing. The effect of varying weld parameters was also investigated. The typical fatigue performance of friction stir welded DH36 steel plates has been established, exhibiting considerably extended fatigue lives, well above 105 cycles at a stress range of 90% of yield strength, irrespective of minor instances of small surface breaking flaws which have been identified. An understanding of the way in which these flaws impact on the fatigue performance has been developed, concluding that surface breaking defects emanating from the friction stir tool’s shoulder marks on the weld top surface can act as the dominant factor for crack initiation under fatigue loading.

AB - A fatigue performance assessment of 6mm thick friction stir welded DH36 steel has been undertaken, filling a significant knowledge gap in the process for steel. A comprehensive set of experimental procedures has been proposed; the consequent study extensively examined the weld microstructure, hardness, geometry and misalignments of the samples in support of the tensile and fatigue testing. The effect of varying weld parameters was also investigated. The typical fatigue performance of friction stir welded DH36 steel plates has been established, exhibiting considerably extended fatigue lives, well above 105 cycles at a stress range of 90% of yield strength, irrespective of minor instances of small surface breaking flaws which have been identified. An understanding of the way in which these flaws impact on the fatigue performance has been developed, concluding that surface breaking defects emanating from the friction stir tool’s shoulder marks on the weld top surface can act as the dominant factor for crack initiation under fatigue loading.

KW - friction stir welding

KW - low alloy steel

KW - fatigue testing

KW - fracture surface

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U2 - 10.1002/9781119093343.ch2

DO - 10.1002/9781119093343.ch2

M3 - Conference contribution book

SN - 9781119082491

VL - VIII

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EP - 20

BT - Friction Stir Welding and Processing VIII

A2 - Mishra, Rajiv S.

A2 - Mahoney, Murray W.

A2 - Sato, Yakuta

A2 - Hovanski, Yuri

CY - New Jersey, USA

T2 - TMS Annual Meeting and Exhibition, TMS2015

Y2 - 15 March 2015 through 19 March 2015

ER -

Fatigue assessment of friction stir welded DH36 steel

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Keywords

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