Evaluation of Microstructure and Selected Mechanical Properties of Laser Beam Welded S690QL High-Strength Steel

Tuz, Lechosław

doi:10.1515/adms-2017-0039

Cited by 23 publications

(21 citation statements)

References 10 publications

(14 reference statements)

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“…19,No. 2 (60), June 2019 in structural steels [2] and in advanced micro-alloyed steels and alloys for high-temperature and high-pressure applications [3,4].…”

Section: Introductionmentioning

confidence: 99%

Problems of Pad Welding Structural Steels with Martensitic Filler Metal

Tasak

Ziewiec

Zielińska‐Lipiec

et al. 2019

Advances in Materials Science

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There is a problem in obtaining a suitable impact strength of the padding weld after cladding with a martensitic filler metal. Too low annealing temperature below 580°C and the excessive annealing temperature above 650°C do not provide adequate impact strength of the padding weld. A heat treatment technology for mixed joints has been developed based on the results of the microscopic observations, X-ray diffraction measurements and transmission electron microscope examination. The problem was identified and a special technology of heat treatment for the dissimilar joint was elaborated. This technology provides a high impact resistance of the padding weld and an appropriate properties of the base material.

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“…19,No. 2 (60), June 2019 in structural steels [2] and in advanced micro-alloyed steels and alloys for high-temperature and high-pressure applications [3,4].…”

Section: Introductionmentioning

confidence: 99%

Problems of Pad Welding Structural Steels with Martensitic Filler Metal

Tasak

Ziewiec

Zielińska‐Lipiec

et al. 2019

Advances in Materials Science

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“…The use of post-weld heat treatment also increase hardness of the weld, HAZ and the base material. Such effect is in the opposite to the high-strength structural steels [18] and advanced steels for power plants [19]. Application of solution treatment before aging results in decreasing the quantity of delta ferrite and improves its resistance [20,21].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Ziewiec

Zielińska‐Lipiec

Kowalska

et al. 2019

Advances in Materials Science

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The paper presents the results of the investigation of microstructure of the welded X5CrNiCuNb16-4 (17-4PH) steel after solution treatment and aging at 620°C for different periods. The microstructure and the phase composition of the steel was investigated using light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), transmission electron microscopy (TEM) and the X-ray diffraction (XRD). Hardness was measured for samples aged at different times. Density distributions of Cu precipitates were established. The investigation has shown that the microstructure of the X5CrNiCuNb16-4 steel welds after aging at 620 ° C consists of tempered martensite, fine Cu precipitates and austenite. It was observed that the size of the Cu precipitates increases with increasing the aging time, what affects the decrease of hardness. Simultaneously, the quantity of reversed austenite increases with increase of aging time. It was revealed that enrichment of the austenite in Ni, Cu and C affects the increase of Ms, but this factor does not determine the stability of austenite.

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“…Laser beam welding (LBW) is a high power density welding process with more than 10 6 W/cm 2 , which is about 1000 times higher than in conventional arc welding [14]. Laser beam welding is praised for its technology, which ensures the highest reliability for its intended application while providing the most efficient, highly accurate and versatile process to join DP steels with low weld heat input, narrow weld, a limited heat-affected zone (HAZ), relatively low distortion and good penetration [15][16][17]. If the welding heat input is low (as in LBW), hardening can occur, indicating that the cold cracking sensitivity [18] and its influence on the HAZ is significantly lower and the microstructure degradation is less than in conventional arc welding technologies [14,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of post-weld heat treatment on microstructure and mechanical properties of DP800 and DP1200 high-strength steel butt-welded joints using diode laser beam welding

2020

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Among the available high-strength steels, there is growing demand for dual phase (DP) steels for wide application in the automotive industry owing to their good combination of high strength, ductility and formability. Also, the use of innovative welding technologies like laser beam welding (LBW) has growing importance in the field of high-strength steel because of its excellence in providing high-quality welds, high welding speed, high power density, low heat input, a narrow heat-affected zone and low heat distortions as compared to the conventional gas metal arc welding process. However, the hardening and softening in the heat-affected zone is a major issue when welding high-strength steel, i.e. DP steel grades, greatly affecting the strength, formability and plasticity of the whole-welded joint and thus affecting service performance and reliability. Based on preliminary experiments, the optimal welding condition was a nominal laser power of 1.0 kW and a welding speed of 8 mm/s. The aim of this work is to analyse and compare the weld and heat-affected zone characteristics, microstructure and mechanical properties of DP steels with 1-mm thick butt joints of DP800 and DP1200 high-strength steel (HSS) by diode laser beam welding. The effects of post-weld heat treatment (PWHT) on the strengthening of the laser-welded joints were evaluated by microstructural examinations under optical microscope and scanning electron microscope, and mechanical properties were examined by microhardness test, three-point bending tests and tensile tests.

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Evaluation of Microstructure and Selected Mechanical Properties of Laser Beam Welded S690QL High-Strength Steel

Cited by 23 publications

References 10 publications

Problems of Pad Welding Structural Steels with Martensitic Filler Metal

Problems of Pad Welding Structural Steels with Martensitic Filler Metal

Microstructure Characterization of Welds in X5CrNiCuNb16-4 Steel in Overaged Condition

Effect of post-weld heat treatment on microstructure and mechanical properties of DP800 and DP1200 high-strength steel butt-welded joints using diode laser beam welding

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