Mechanical properties of welded ultrahigh-strength S960 steel at low and elevated temperatures

Keränen, Lassi; Nousiainen, Olli; Javaheri, Vahid; Kaijalainen, Antti; Pokka, Aki-Petteri; Keskitalo, Markku; Niskanen, Juhani; Kurvinen, Emil

doi:10.1016/j.jcsr.2022.107517

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…Due to strict constraints, the longitudinal stress had a high-tensile value near the weld and became compressed away from the weld, and the transverse residual stress distribution was almost constant relative to the longitudinal stress distribution. This made the longitudinal stress basically a tensile stress [ 35 ]. It can be concluded that most of the stress in the sample was mainly caused by the longitudinal stress and was mainly concentrated in the WZ.…”

Section: Results and Analysismentioning

confidence: 99%

Effects of Different Pre-Heating Welding Methods on the Temperature Field, Residual Stress and Deformation of a Q345C Steel Butt-Welded Joint

Jie

Zhong³

et al. 2023

Materials

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Heavy plate welding has been widely used in the construction of large projects and structures, in which the residual stress and deformation caused by the welding process are the key problems to address to reduce the stability and safety of the whole structure. Strengthening before welding is an important method to reduce the temperature gradient, control the residual stress and reduce the deformation of welds. Based on the ABAQUS software, the thermal elastoplastic finite element method (FEM) was used to simulate the welding thermal cycle, residual stress and deformation of low-alloy, high-strength steel joints. Based on the finite element simulation, the influences of flame heating and ceramic heating on the temperature field, residual stress distribution and deformation of a Q345C steel butt-welded joint were studied. The results showed that the thermal cycle of the ceramic sheet before welding had little influence on the whole weldment, but had great influence on the residual stress of the weldment. The results show that the maximum temperature and residual stress of the welded parts are obviously weakened under the heating of ceramic pieces, and the residual stress of the selected feature points is reduced by 5.88%, and the maximum temperature of the thermal cycle curve is reduced by 22.67%. At the same time, it was concluded that the weld shapes of the two were basically the same, but the weld seams heated by ceramic pieces had a better weld quality and microstructures through comparing the macro- and micro-structures between the welded parts heated by ceramic pieces and the simulated weld. Heating before welding, therefore, is an effective method to obtain a high weld quality with less residual stress and deformation.

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Section: Results and Analysismentioning

confidence: 99%

Effects of Different Pre-Heating Welding Methods on the Temperature Field, Residual Stress and Deformation of a Q345C Steel Butt-Welded Joint

Jie

Zhong³

et al. 2023

Materials

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“…Provisionally ultra-high-strength S960 steel (EN 10025–6) [ 14 , 15 ] was chosen as material for the GI components with a minimum yield stress of f y = 960 MPa. EUROFER has been considered as material for the BB segment [ 16 ].…”

Section: Structural Analysesmentioning

confidence: 99%

Structural assessment of the gripper interlock of the DEMO breeding blanket transporter

Mozzillo

Bachmann²,

Fanelli

et al. 2023

Heliyon

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“…The latest version of prEN 1993-1-8 [28] stipulates that the strength of butt-welded connections in steel grades equal to or higher than S460 may be determined by Eq. (18).…”

Section: Comparison Of the Proposed Macro Model And The Model In Pren...mentioning

confidence: 99%

“…Many experimental studies have been carried out to investigate the tensile behaviour of butt-welded high-strength steel (HSS, 460 MPa ≤ f y ≤ 700 MPa) and ultra-high-strength steel (UHSS, f y > 700 MPa) connections [1,3,6,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. HAZ plays a vital role in the welded connection if HAZ has the lowest strength in the entire weld region.…”

Section: Introductionmentioning

confidence: 99%

“…As the resistance of the welded connection decreases with the decrease of WM strength in general [20], the strengths of BM and WM are considered in the current design rule of prEN 1993-1-8 [28]. However, the failure of welded connection is often governed by HAZ [6,11,13,16,18,[20][21][22]24]. Hence, it is unrealistic to accurately predict the tensile resistance of HSS and UHSS connections without considering the strength of HAZ.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A macro prediction model for butt-welded (U)HSS connections with softened HAZ

Yan

Xie

Yang

et al. 2023

Journal of Constructional Steel Research

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Mechanical properties of welded ultrahigh-strength S960 steel at low and elevated temperatures

Cited by 15 publications

References 29 publications

Effects of Different Pre-Heating Welding Methods on the Temperature Field, Residual Stress and Deformation of a Q345C Steel Butt-Welded Joint

Effects of Different Pre-Heating Welding Methods on the Temperature Field, Residual Stress and Deformation of a Q345C Steel Butt-Welded Joint

Structural assessment of the gripper interlock of the DEMO breeding blanket transporter

A macro prediction model for butt-welded (U)HSS connections with softened HAZ

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