The Performance of CR180IF and DP600 Laser Welded Steel Sheets under Different Strain Rates

Mihaliková, Mária; Zgodavová, Kristína; Bober, Peter; Spegarova, A.

doi:10.3390/ma14061553

Cited by 10 publications

(13 citation statements)

References 29 publications

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“…So, the ductile fracture indicates that the weld joint before quenching has a good plasticity [19]. However, some river patterns and many voids are also observed in the dimples, mainly due to the high martensite strength and poor ductility after quenching, and a large number of secondary cracks and dissociation platform occur during the tensile process [21]. The dimples in Fig.…”

Section: Fracture Morphologymentioning

confidence: 96%

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Zhou¹,

Zhu²,

Ma³

et al. 2021

Preprint

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With the aim to investigate the effect of parameter and quenching process on the joint of hot stamping steel by laser welding, the BR1500HS boron steel was welded by filling-wire laser welding with ER70-G welding wire under different parameters. The welded specimens were heated to 900℃ and held for 5min before water quenching. The universal material test machine, Optical micro-scope, Vickers hardness tester, scanning electron microscope and electron backscatter diffraction (EBSD) were used to characterize. The results showed that the macroscopic morphology of fusion zone (FZ) becomes from funnelform to hyperbolic curve shape when heat input increases and from hyperbolic curve shape to funnelform when wire-feed speed increases. The strength after quenching is more than 1557Mpa at heat input of 1040J/cm, wire feeding speed of 1.6m/min~1.8m/min and welding speed of 1.5m/min. EBSD test showed that the FZ and fine grain zone (FGZ) have more retained austenite (RA) than coarse grain zone (CGZ) before quenching and RA in FZ and heat affect zone (HAZ) decreased and distributed uniformed after quenching. The grain diameter in FZ distribute unevenly, with the maximum grain diameter larger than 40μm before quenching. After quenching, the grain diameter of FZ, HAZ and BM is more even and coarse grains in the FZ was refined. Before quenching, the microhardness of FZ and HAZ is of 450HV~500HV at different heat input and wire-feed speed and all region of joint keeps at 450HV~550HV after quenching. Most dimple and little river pattern in the joint fracture mor-phology before quenching indicates a well plasticity and most cleavage facet is observed after quenching due to the joint combine with martensite.

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Section: Fracture Morphologymentioning

confidence: 96%

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Zhou¹,

Zhu²,

Ma³

et al. 2021

Preprint

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show abstract

“…2 has been used for many years and has undergone a significant change in recent years. The automotive industry has a significant impact on people's daily lives worldwide and affects their safety (Mihaliková et al, 2021). Two basic approaches in the automotive industry represented by the AIAG manual (2022) and the VDA manual (2022) have united, and the result is a joint harmonized edition of the FMEA manual, the first edition of the AIAG & VDA FMEA Handbook.…”

Section: Table 2 -Description Of the Steps In The Application Of Fmeamentioning

confidence: 99%

Risk Assessment Using the PFDA-FMEA Integrated Method

Cicka

Turisová

Čičková³

2022

QIP Journal

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Purpose: The paper aims to introduce risk assessment in new product development as an important activity for a successful new product launch. A practical example is presented to demonstrate the integration of tools Failure Mode and Effect Analysis (FMEA) and Pythagorean Fuzzy Dimensional Analysis (PFDA) at new product development process, which is a machined component. Methodology/Approach: Individual steps for creating a case study were carried out: create a Subject Matter Expert (SME) team, identify product failure modes, use linguistic values to assess the FMEA, compute and obtain the PFDA-FMEA and determine the product failure modes ranking. Findings: Minimized uncertainty in the final evaluation of the FMEA and improvement in the decision-making process based on the risks already identified in the new product development process. Research Limitation/Implication: The PFDA-FMEA method was based on the risk assessment of a machined part development process. Nevertheless, this method can be used for application in many other areas of industry that require high precision in risk analysis. Originality/Value of paper: The aim of this paper is to reveal a new integrated method in which FMEA, Pythagorean Fuzzy Sets (PFS) and Dimensional Analysis (DA) are coherent in one model.

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“…However, some river patterns and many voids are also observed in the dimples. This is mainly caused by the generation of high strength and poor ductility martensite after quenching and the large number of secondary cracks and dissociation platforms which occur during the tensile process [24]. The dimples in Figure 18b are cup-shaped dimples with large depth mixed with a large number of voids.…”

Section: Fracture Morphologymentioning

confidence: 99%

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Zhou

Zhu

et al. 2021

Metals

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With the aim to investigate the effect of parameters and the quenching process on the joint microstructure and mechanical properties of hot stamping steel by laser welding, BR1500HS boron steel was welded by wire-filling laser welding with ER70-G welding wire under different parameters. The welded specimens were heated to 900 °C and held for 5 min before water quenching. A universal material test machine, optical microscope, Vickers hardness tester, scanning electron microscope, and electron backscatter diffraction (EBSD) were used to characterize. The results show that the heat input should be greater than 1040 J/cm and the optimal wire-feeding speed is between 160 cm/min and 180 cm/min. The tensile strength of the quenched joint can reach greater than 1601.9 MPa at compatible parameters. More retained austenite distributes in the fusion zone (FZ) and fine grain zone (FGZ) than the coarse grain zone (CGZ) before quenching. However, the retained austenite in FZ and heat-affected zone (HAZ) decreases clearly and distributes uniformly after quenching. The grain diameter in FZ before quenching is not uniform and there are some coarse grains with the diameter greater than 40 μm. After quenching, the grains are refined and grain diameter is more uniform in the joint. With the increase in heat input, the microhardness of FZ and HAZ before quenching decreases from 500 HV to 450 HV. However, if the wire-feeding speed increases, the microhardness of FZ and HAZ before quenching increases from 450 HV to 500 HV. After quenching, the joint microhardness of all samples is between 450 HV and 550 HV. The fracture morphology of the joint before quenching consists of a large number of dimples and little river patterns. After quenching, the fracture morphology consists of a large amount of river patterns and cleavage facets due to the generation of martensite.

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The Performance of CR180IF and DP600 Laser Welded Steel Sheets under Different Strain Rates

Cited by 10 publications

References 29 publications

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

Risk Assessment Using the PFDA-FMEA Integrated Method

Research on Parameters of Wire-Filling Laser Welding and Quenching Process for Joints Microstructure and Mechanical Property of BR1500HS Steel

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