A1 Journal article (refereed), original research

Plastic strain characteristics of butt-welded ultra-high strength steel (UHSS)


LUT Authors / Editors

Publication Details
Authors: Amraei Mohsen, Skriko Tuomas, Björk Timo, Zhao Xiao-Ling
Publication year: 2016
Language: English
Related Journal or Series Information: Thin-Walled Structures
Volume number: 109
Start page: 227
End page: 241
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication

Abstract
This paper investigates the mechanical properties of direct quenched (DQ) ultra-high strength steel (UHSS)joints in butt-welded configuration. Experimental and numerical investigation of the monotonic behavior ofheat-treated and welded UHSS is undertaken. The tensile tests in the study investigate the effects of threedifferent parameters on the plastic strain capacity of UHSS, namely: size of the heat affected zone (HAZ),matching between the filler material and the BM, and welding and post welding treatments such as TIGdressingand high frequency mechanical impact (HMFI) treatment. Laser welding with a narrow HAZ was alsoperformed without filler material and with zero air gap. A digital image correlation technique was utilized tomonitor the plastic behavior of the specimens under tensile loading. The results indicate that the strain capacityof the joint is highly sensitive to heat input (HI); even a small HAZ leads to a considerable drop in the straincapacity. A strong constraint at the boundaries of the HAZ with the surrounding material generates ahydrostatic stress component, and thus an increase in both the ductility and strength of the joint can beexpected.

Last updated on 2018-19-10 at 08:49