Mechanical Properties of Heat Affected Zone of High Strength Steels

Sefcikova, K; Brtnik, T; Dolejš, Jakub; Keltamäki, Kimmo; Topilla, R

doi:10.1088/1757-899x/96/1/012053

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…This category includes MAG welding wires with a classification of G 89, according to the EN ISO 16834-A standard. Sefcikova et al [18], Pisarski et al [19], and other authors [4,20,21] used this type of add-on material in their experiments. They compared the results of the mechanical properties of welded joints, when applying undermatching and matching welding wire.…”

Section: Introductionmentioning

confidence: 99%

Effect of the t8/5 Cooling Time on the Properties of S960MC Steel in the HAZ of Welded Joints Evaluated by Thermal Physical Simulation

Mičian

Harmaniak

Nový

et al. 2020

Metals

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The heat input into the material during welding significantly affects the properties of high-strength steels in the near-weld zone. A zone of hardness decrease forms, which is called the soft zone. The width of the soft zone also depends on the cooling time t8/5. An investigation of the influence of welding parameters on the resulting properties of welded joints can be performed by thermal physical simulation. In this study, the effect of the cooling rate on the mechanical properties of the heat-affected zone of the steel S960MC with a thickness of 3 mm was investigated. Thermal physical simulation was performed on a Gleeble 3500. Three levels of cooling time were used, which were determined from the reference temperature cycle obtained by metal active gas welding (MAG). A tensile test, hardness measurement, impact test with fracture surface evaluation, and microstructural evaluation were performed to investigate the modified specimen thickness. The shortest time t8/5 = 7 s did not provide tensile and yield strength at the minimum required value. The absorbed energy after recalculation to the standard sample size of 10 × 10 mm was above the 27 J limit at −40 °C. The hardness profile also depended on the cooling rate and always had a softening zone.

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Section: Introductionmentioning

confidence: 99%

Effect of the t8/5 Cooling Time on the Properties of S960MC Steel in the HAZ of Welded Joints Evaluated by Thermal Physical Simulation

Mičian

Harmaniak

Nový

et al. 2020

Metals

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“…In these fabrication routes, welding or combined welding and cold-bending processes were applied. Welding process induces heat-input to the materials around the welding seam and causes heat affected zone (HAZ) in which the material properties can be different from those of the materials outside HAZ [37]. Cold-bending process also affects the material properties due to strain hardening effect at the cold-bending region subject to large plastic deformations [32,[38][39].…”

Section: Introductionmentioning

confidence: 99%

Material properties and residual stresses of octagonal high strength steel hollow sections

Fang

Chan

Young

2018

Journal of Constructional Steel Research

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This paper presents an experimental investigation to quantify the variation of material properties and residual stresses in the octagonal high strength steel hollow sections from different fabrication routes involving welding or combinations of welding and press-braking. Tensile coupon tests were conducted on the specimens extracted from different locations of the hollow sections with different fabrication routes and static mechanical properties and stress-strain relationship for the specimens were measured. The influence of welding on the material properties was found to be insignificant while strength enhancement was observed for the material at corners formed by press-braking. A stress-strain curve model was proposed for the material across octagonal high strength steel hollow sections. The magnitudes and distributions of longitudinal residual stresses of the octagonal high strength steel hollow sections with different fabrication routes were also measured using the sectioning method and were also found to be dependent on the fabrication route. Based on the measured residual stress results, residual stress models were developed for the hollow sections from different fabrication routes. The obtained variation of material properties and longitudinal residual stresses can be employed to accurately analyse the performance of octagonal high strength steel hollow section structural members for efficient structural designs.

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“…The welding fabrication process induces residual stresses due to strain misfit when welding material solidifies [18]. Besides, the heataffected zone (HAZ) generated from the induced heat input of welding would adversely influence the structural behaviour since the material inside HAZ would be significantly altered [24,25], causing premature yielding and stiffness loss to the HSS tubular members, invariably leading to great level of deterioration of loading bearing capabilities. Cold-forming process including the cold-rolling and press-braking essentially resulted in altered material properties at the cold-formed regions due to the excessive strain-hardening at cold-formed regions with significant plastic deformation [19][20][21][22][23].…”

mentioning

confidence: 99%

Material properties and residual stresses of high strength steel hexagonal hollow sections

Liu

Fang

Chen

et al. 2022

Journal of Constructional Steel Research

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Mechanical Properties of Heat Affected Zone of High Strength Steels

Cited by 8 publications

References 2 publications

Effect of the t8/5 Cooling Time on the Properties of S960MC Steel in the HAZ of Welded Joints Evaluated by Thermal Physical Simulation

Effect of the t8/5 Cooling Time on the Properties of S960MC Steel in the HAZ of Welded Joints Evaluated by Thermal Physical Simulation

Material properties and residual stresses of octagonal high strength steel hollow sections

Material properties and residual stresses of high strength steel hexagonal hollow sections

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