Fatigue assessment of friction stir welded DH36 steel

Athanasios Toumpis; Alexander Galloway; Helena Polezhayeva; Lars Molter

Fatigue assessment of friction stir welded DH36 steel

Athanasios Toumpis
, Alexander Galloway
, Helena Polezhayeva
, Lars Molter

Mechanical And Aerospace Engineering

Research output: Contribution to conference › Paper › peer-review

2 Citations (Scopus)

262 Downloads (Pure)

Abstract

A fatigue performance assessment of 6 mm 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
Number of pages	9
Publication status	Published - 15 Mar 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

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Toumpis-etal-TMS2015-Fatigue-assessment-of-friction-stir-welded-DH36-SteelAccepted author manuscript, 628 KB

Cite this

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

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AU - Toumpis, Athanasios

AU - Galloway, Alexander

AU - Polezhayeva, Helena

AU - Molter, Lars

PY - 2015/3/15

Y1 - 2015/3/15

N2 - A fatigue performance assessment of 6 mm 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 6 mm 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

UR - http://www.tms.org/annual-15/AM15home.aspx

M3 - Paper

T2 - TMS Annual Meeting and Exhibition, TMS2015

Y2 - 15 March 2015 through 19 March 2015

ER -

Fatigue assessment of friction stir welded DH36 steel

Abstract

Conference

Keywords

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