Microstructure and mechanical properties of laser welded S960 high strength steel

Guo, Wei; Crowther, D. N.; Francis, J. A.; Thompson, Alan; Liu, Zhu; Li, Lin

doi:10.1016/j.matdes.2015.07.037

Cited by 119 publications

(67 citation statements)

References 37 publications

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“…where f(C) is the accommodation factor and is calculated as; In the welding process, final microstructures are affected by peak temperature and the cooling rate of the relevant zones, and carbon equivalent (CE) value resulted from the chemistry of the steels [29][30][31][32]. Although there are numerous formulae for calculating CE, Yurioka's formula was used in this study because of its suitability for C-Mn steels [33].…”

Section: Microstructure and Microhardness Evolutionmentioning

confidence: 99%

The Optimization of Process Parameters and Microstructural Characterization of Fiber Laser Welded Dissimilar HSLA and MART Steel Joints

Yüce

Tutar

Karpat

et al. 2016

Metals

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Nowadays, environmental impact, safety and fuel efficiency are fundamental issues for the automotive industry. These objectives are met by using a combination of different types of steels in the auto bodies. Therefore, it is important to have an understanding of how dissimilar materials behave when they are welded. This paper presents the process parameters' optimization procedure of fiber laser welded dissimilar high strength low alloy (HSLA) and martensitic steel (MART) steel using a Taguchi approach. The influence of laser power, welding speed and focal position on the mechanical and microstructural properties of the joints was determined. The optimum parameters for the maximum tensile load-minimum heat input were predicted, and the individual significance of parameters on the response was evaluated by ANOVA results. The optimum levels of the process parameters were defined. Furthermore, microstructural examination and microhardness measurements of the selected welds were conducted. The samples of the dissimilar joints showed a remarkable microstructural change from nearly fully martensitic in the weld bead to the unchanged microstructure in the base metals. The heat affected zone (HAZ) region of joints was divided into five subzones. The fusion zone resulted in an important hardness increase, but the formation of a soft zone in the HAZ region.

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Section: Microstructure and Microhardness Evolutionmentioning

confidence: 99%

The Optimization of Process Parameters and Microstructural Characterization of Fiber Laser Welded Dissimilar HSLA and MART Steel Joints

Yüce

Tutar

Karpat

et al. 2016

Metals

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“…The CGHAZ is the weakest zone in the weld joint, for its lowest toughness because of grain coarsening and high hardness [8][9][10]. The thickness of CGHAZ at different position was calculated, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the characterization and properties of EH36 steel FCB welded joint

Wang¹,

Jiang²,

Ma³

et al. 2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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“…Fiber laser welding has many advantages, such as high energy density, low heat input, small welding deformation, and flexibility [11][12][13][14][15][16]. Compared with Nd:YAG lasers, a fiber laser beam has a higher power density and larger Rayleigh length.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with Nd:YAG lasers, a fiber laser beam has a higher power density and larger Rayleigh length. Therefore, fiber lasers are more suitable for welding thin-walled metals [12,14,[16][17][18][19][20]. Casalino et al [18] studied the laser offset welding of AZ31B magnesium alloy to 316 stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint

Zhang

et al. 2018

Metals

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There are two kinds of typical cross-section profiles for the fusion zone (FZ) of a laser welded thin section joint, i.e., a V-shaped cross-section and an H-shaped cross-section. Previous researches indicated that tensile strength of the V-shaped joint was lower than that of the H-shaped one due to the greater heterogeneity of strain distribution on the V-shaped joint during tensile process. In this work, impacts of the aspect ratio of FZ on the mechanical properties of laser welded thin section joints with an H-shaped cross-section profile were investigated. Welding conditions corresponding to two typical H-shaped joints (i.e., W narrower with a narrower FZ, and W wider with a wider FZ) were decided through a laser welding orthogonal experimental plan. Then, the microstructure and properties of both joints were examined and compared. The results show that the tensile strength of joint W narrower and joint W wider was about 72% and 80.9% that of the base metal, respectively. Both joints fractured in the FZ during tensile processes. The low-cycle fatigue life of the base metal, the joint W narrower and the joint W wider were 3377.5 cycles, 2825 cycles and 3155.3 cycles, respectively. By using high-speed imaging, it was found that the fatigue crack of joint W narrower initiated and propagated inside the fusion zone, while the fatigue crack of the joint W wider initiated at the edge of the base metal and propagated for a distance within the base metal before entering into the fusion zone. This work promoted our understanding about the influence of the weld bead shape on the properties of laser welded thin section joints.

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Microstructure and mechanical properties of laser welded S960 high strength steel

Cited by 119 publications

References 37 publications

The Optimization of Process Parameters and Microstructural Characterization of Fiber Laser Welded Dissimilar HSLA and MART Steel Joints

The Optimization of Process Parameters and Microstructural Characterization of Fiber Laser Welded Dissimilar HSLA and MART Steel Joints

Investigation on the characterization and properties of EH36 steel FCB welded joint

Study on the Size Effects of H-Shaped Fusion Zone of Fiber Laser Welded AZ31 Joint

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