Mechanical properties of butt-welded ultra-high strength steels at elevated temperatures

Ghafouri, Mehran; Amraei, Mohsen; Pokka, Aki-Petteri; Björk, Timo; Larkiola, Jari; Piili, Heidi; Zhang, Xiaolin

doi:10.1016/j.jcsr.2022.107499

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…Based on the image of the multi-pass welding, it was clear that due to the welding passes, there was cumulative heat input that widened the extension of the HAZ. In research related to the influence of different welding inputs on S1100QL material, Mehran et al [32] evidenced that an increase in the heat input on the joint influenced a change in the microstructure by tempering the martensite structure on the welding region. In addition, it was also observed that good control of the heat input could lead to the necessary equilibrium between the weld hardening and tempering.…”

Section: Thermal Cycle By Thermocouples and Simulation Resultsmentioning

confidence: 99%

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Optimization of GMAW Process Parameters in Ultra-High-Strength Steel Based on Prediction

Netto

Bayock

Kah

2023

Metals

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Ultra-high-strength steel (UHSS) is a complex and sophisticated material that allows the development of products with reduced weight but increased strength and can assist, for example, in the automotive industry, saving fuel in vehicles and decreasing greenhouse gas emissions. Welding UHSS has a certain complexity, mainly due to the higher alloys and heat treatments involved, which can result in a microstructure with higher sensitivity to welding. The primary purpose of the current work was to select the best parameters of the gas metal arc welding (GMAW) for welding the S960 material based on prediction methods. To achieve the expected results, a finite element analysis (FEA) was used to simulate and evaluate the results. It was found that the welding parameters and, consequently, the heat input derived from the process greatly affected the UHSS microstructure. Using FEA and estimating the extension of the heat-affected zone (HAZ), the peak temperature, and even the effect of distortion and shrinkage was possible. With an increase in the heat input of 8.4 kJ/cm, the estimated cooling rate was around 70 °C/s. The presence of a softening area in the coarse grain heat-affected zone (CGHAZ) of welded joints was identified. These results led to an increase in the carbon content (3.4%) compared to the base metal. These results could help predict behaviors or microstructures based on a few changes in the welding parameters.

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Section: Thermal Cycle By Thermocouples and Simulation Resultsmentioning

confidence: 99%

“…Considering this, the recommended carbon content should be below 0.1%, which is preferably prioritized if compared to a high carbon equivalent [6,31]. However, due to the production cost, the first alloying component usually used to increase the strength of steel is carbon [32][33][34][35][36].…”

Section: Materials Propertiesmentioning

confidence: 99%

Optimization of GMAW Process Parameters in Ultra-High-Strength Steel Based on Prediction

Netto

Bayock

Kah

2023

Metals

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“…When connecting various structural components in the field of energy, shipbuilding, automotive industry, pressure equipment, etc., a welding procedure is imposed as a logical and dominant choice of joining technology [1][2][3][4]. Among the many welding technologies used in industrial practice that are based on the addition of filler material depositions from molten metal wires, the Metal Active Gas (MAG) welding procedure occupies a prominent place due to its recognized quality, easy performance, low price and application simplicity [5,6]. Appreciating all the good sides of the material joining process by welding, it is impossible to avoid those bad ones that are reflected in the formation of residual stresses and deformations that arise from the rapid cooling and shrinking of the molten filler material and its close surroundings to the ambient temperature [7,8].…”

Section: Introductionmentioning

confidence: 99%

Metal-Cored Arc Welding of I-Profile Structure: Numerical Calculation and Experimental Measurement of Residual Stresses

Perić,

Garašić,

Štefok

et al. 2023

Metals

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In this study, numerical and experimental research of residual stresses was carried out on an I-profile structure model and welded by using the Metal-cored Arc Welding (MCAW) technique. The numerical research was carried out by sequential simulation, using the birth and death element in the thermal analysis, while the same was omitted in the mechanical analysis in order to speed up the calculation process. The measurement of residual stresses was conducted on the outer surfaces of the model at a depth of 0.015 mm below the surface. It was determined that the longitudinal stresses in the weld and its immediate surroundings are tensile, while towards the ends of the model, they change to compressive. Transversal residual stresses exist mainly around the weld itself, and the immediate surroundings and decrease towards the ends of the model. A high agreement between the numerical and experimental results was found.

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Experimental study on the properties of Q960 ultra–high–strength steel after fire exposure

et al. 2023

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Mechanical properties of butt-welded ultra-high strength steels at elevated temperatures

Cited by 10 publications

References 33 publications

Optimization of GMAW Process Parameters in Ultra-High-Strength Steel Based on Prediction

Optimization of GMAW Process Parameters in Ultra-High-Strength Steel Based on Prediction

Metal-Cored Arc Welding of I-Profile Structure: Numerical Calculation and Experimental Measurement of Residual Stresses

Experimental study on the properties of Q960 ultra–high–strength steel after fire exposure

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