Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

Švec, Pavol; Schrek, Alexander; Dománková, Mária

doi:10.4149/km_2018_1_29

Cited by 5 publications

(15 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanical properties obtained in different welding zones are a function of the microstructure. To understand the welding behavior, it is helpful to examine the microstructure of the base materials and welded joints [25,26]. Analyses of the microstructure in the fusion zone (FZ), heat-affected zone (HAZ), and base metal (BM) for all specimens were performed.…”

Section: Microstructure Characterization Of the Laser Welding Jointsmentioning

confidence: 99%

Mechanical and Microstructural Investigations of the Laser Welding of Different Zinc-Coated Steels

Zdravecká

Slota

2019

Metals

View full text Add to dashboard Cite

Tailor welded blanks (TWB) represent an anisotropic and non-homogenous material. The knowledge of the mechanical properties and microstructure of the fusion zone and heat-affected zone (HAZ) obtained with laser welding is essential to ensure the reliability of the process. In this paper, laser-welded hot-dip Zn-coated low carbon microalloyed steels with different thickness and mechanical properties were used. The mechanical properties of the laser-welded blanks were determined by tensile tests and formability by Erichsen cupping tests. In addition, the pore formation during the laser welding process was analyzed. The microstructural analysis confirmed the formation of the favorable structure of the weld metal and the heat-affected zone without the presence of martensite. The obtained results showed that it is possible to produce TWBs with suitable mechanical properties by laser welding.

show abstract

Section: Microstructure Characterization Of the Laser Welding Jointsmentioning

confidence: 99%

Mechanical and Microstructural Investigations of the Laser Welding of Different Zinc-Coated Steels

Zdravecká

Slota

2019

Metals

View full text Add to dashboard Cite

show abstract

“…In recent years, the weldability [13,14] of high-strength complex phase steel, as well as the microstructure [15,16] and properties [17][18][19][20] of welded joints, have been widely investigated. M. Zhang et al [11] studied the weldability of 3.5mm thick Ti microalloyed steel CP800.…”

Section: Introductionmentioning

confidence: 99%

“…The tensile strength of the joint was greater than 620MPa, meeting the usage requirements. X. Zhu et al [15] and P. Svec et al [16] all found the hardening of the HAZ when studying the 1mm and 1.5mm thick CP780 laser welded joints, which is related to the formation of lath martensite and bainite. Besides, P. Svec et al [16] also found a significant softening in the subcritical zone with the increase of welding heat input, which was formed by the coarsening of grains.…”

Section: Introductionmentioning

confidence: 99%

Evolutions of Microstructure and Mechanical Properties of the Welding Heat-affected Zone in 800 MPa-grade Complex Phase Steel

Wang,

Dong,

et al. 2024

ISIJ Int.

View full text Add to dashboard Cite

A thermomechanical simulator Gleeble 3800 was used to simulate the thermal cycles experienced by various heat-affected zones (HAZ) during the welding process. The influence of peak temperature (T p , 500℃~1320℃) on the hardness, microstructure, precipitates, and properties of complex steel 780FB with microalloyed elements Ti, Nb, and V was systematically studied. The contributions of dislocation strengthening, precipitation strengthening, fine grain strengthening, and phase transformation strengthening increments to strength changes of samples after different thermal cycles were quantified, and the calculated results were found to be consistent with the experimental data. Compared with 780FB, there was little change in microstructure and properties when T p was 500℃. When T p was 650℃, the increase in VC density from 43/μm 2 to 288/μm 2 caused the enhancement of hardness and strength. The precipitation strengthening increment (49.84MPa) played a dominant role in strength improvement. As partial bainite in the microstructure of 780FB transformed into ferrite at T p of 800℃, the weakening of phase transformation strengthening (-57.5MPa) became the main factor in strength change. The softening and strength reduction further increased when T p was up to 980℃, as 780FB completely recrystallized and transformed into ferrite and MA islands. The phase transformation strengthening further reduced by 74.75MPa. When T p was 1320℃, the VC density decreased from 43/μm 2 to 13/μm 2 , and the (Ti,Nb)C density decreased from 34/μm 2 to 14/μm 2 , leading to severe grain growth (2.24μm to 19.89μm) and bainite transformation. The decrease in precipitation strengthening ) and fine grain strengthening (-87.91MPa) counteracted with the increase in phase transformation strengthening (51.62MPa), resulting a slight decrease in hardness and strength.

show abstract

“…Fe-Zn and Zn-Al-Mg coatings are harder, more scratch resistant, have better weldability, compressibility, paintability and reduce zinc consumption compared to pure zinc coatings [7,8,9]. Weldability and formability are important characteristics of Tailored Welded Blanks for car body parts, especially when different steels are welded [10].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Steel Sheets’ Corrosion Resistance by Application of New Generation Coatings

Evin

Tomáš

Kepič

2020

METAL 2020 Conference Proeedings

View full text Add to dashboard Cite

Besides customers and environmental requirements such as safety increase, the weight and emission reduction, and the life-time improvement, huge role plays corrosion resistance of the car-body components. This is improved by applying Zn-based coatings on the steel sheets. In the article are presented results of corrosion tests performed on the steel sheets with Zn-Al-Mg coatings applied. These are compared to the standard Zn coating. Samples were deformed by Erichsen stretching test and by 3-point bending tests to the angle of 90° and 180°. After that, these were exposed to salt spray in the corrosion chamber. The limit criteria were time to red corrosion appearance and percentage of corroded surface evaluated on time. The results showed the small amount of Al and Mg improved the corrosion resistance of Zn-Al-Mg coatings when compared to the conventional Zn coating.

show abstract

Microstructural characteristics of fibre laser welded joint of dual phase steel with complex phase steel

Cited by 5 publications

References 43 publications

Mechanical and Microstructural Investigations of the Laser Welding of Different Zinc-Coated Steels

Mechanical and Microstructural Investigations of the Laser Welding of Different Zinc-Coated Steels

Evolutions of Microstructure and Mechanical Properties of the Welding Heat-affected Zone in 800 MPa-grade Complex Phase Steel

Improvement of Steel Sheets’ Corrosion Resistance by Application of New Generation Coatings

Contact Info

Product

Resources

About