Effect of Welding Speed and Post Quenching on the Microstructure and Mechanical Properties of Laser-Welded B1500HS Joints

Li, Muyu; Yao, Dan; Guan, Yaping; Duan, Yongchuan; Liu, Yang

doi:10.3390/ma13204645

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…For HAZ metals far from the welding heat source, the peak heating temperatures range from Ac 1 to Ac 3 , and only part of the original microstructure undergoes austenitization during welding. Therefore, the microstructure consists of ferrite-martensite mixtures during subsequent cooling [36,37].…”

Section: The Isothermal Treatment Methodsmentioning

confidence: 99%

The Development of a Continuous Constitutive Model for Thin-Shell Components with A Sharp Change in the Property at Welded Joints

He,

Ruan,

Liang

et al. 2024

Materials

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Large-dimension complex integral thin-shell components are widely used in advanced transportation equipment. However, with the dimensional limitations of raw blanks and the manufacturing process, there are inhomogeneous geometric and mechanical properties at welded joints after welding, which have a significant effect on the subsequent forming process. Therefore, in this paper, the microstructure of welded joints with a sharp property change was accurately characterized by the proposed isothermal treatment method using the BR1500HS welded tube as an example. In addition, an accurate constitutive model of welded tubes was established to predict the deformation behavior. Firstly, the heat-treated specimens were subjected to uniaxial tensile tests and the stress–strain curves under different heat treatment conditions were obtained. Then, the continuous change in flow stress in the direction of the base metal zone, the heat-affected zone and the weld zone was described by the relationship between the microhardness, flow stress and center angle of the welded tube. Using such a method, a continuous constitutive model of welded tubes has been established. Finally, the constitutive model was compiled into finite-element software as a user material subroutine (VUHARD). The reliability of the established constitutive model was verified by simulating the free hydro-bulging process of welded tubes. The results indicated that the continuous constitutive model can well describe the deformation response during the free hydro-bulging process, and accurately predicted the equivalent strain distribution and thickness thinning rate. This study provides guidance in accurately predicting the plastic deformation behavior of welded tubes and its application in practice in hydroforming industries.

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Section: The Isothermal Treatment Methodsmentioning

confidence: 99%

The Development of a Continuous Constitutive Model for Thin-Shell Components with A Sharp Change in the Property at Welded Joints

He,

Ruan,

Liang

et al. 2024

Materials

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“…Observing the macroscopic morphology in Figure 8a, the joint can be divided into fusion zone (FZ), heat-affected zone (HAZ), and base material (BM). The microstructure of the FZ is shown in Figure 8b; martensite (M) is the main microstructure in this zone due to the rapid cooling after laser welding [13]. The HAZ can be divided into the coarse-grain zone (CGZ), fine-grain zone (FGZ), and incomplete recrystallization zone (IRZ), according to the degree of transformation [13].…”

Section: Microstructure Before Quenchingmentioning

confidence: 99%

“…The microstructure of the FZ is shown in Figure 8b; martensite (M) is the main microstructure in this zone due to the rapid cooling after laser welding [13]. The HAZ can be divided into the coarse-grain zone (CGZ), fine-grain zone (FGZ), and incomplete recrystallization zone (IRZ), according to the degree of transformation [13]. The temperature of the CGZ and the FGZ exceeded the Ac 3 line by the function of thermal cycle.…”

Section: Microstructure Before Quenchingmentioning

confidence: 99%

“…Ho Won Lee et al [12] investigated the effect of post-welding heat treatment (PWHT) of quenching and tempering (QT) on the microstructure and mechanical properties of welded boron steel joints processed using laser-arc hybrid welding on two commercial filler materials, SM80 (Type-I) and ZH120 (Type-II). Muyu Li et al [13] researched the effects of welding speed and post quenching on the joint microstructure, microhardness, and high-temperature tensile properties.…”

Section: Introductionmentioning

confidence: 99%

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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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“…8(b), martensite (M) is the main microstructure in this zone due to the rapid cooling speed after laser welding [13]. HAZ can be divided into the coarse-grain zone (CGZ), fine-grain zone (FGZ) and incomplete recrystallization zone (IRZ) according to the degree of transformation [13]. The temperature of CGZ and FGZ had exceeded the Ac3 line by the function of thermal cycle.…”

Section: Microstructure Before Quenchingmentioning

confidence: 99%

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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Effect of Welding Speed and Post Quenching on the Microstructure and Mechanical Properties of Laser-Welded B1500HS Joints

Cited by 7 publications

References 25 publications

The Development of a Continuous Constitutive Model for Thin-Shell Components with A Sharp Change in the Property at Welded Joints

The Development of a Continuous Constitutive Model for Thin-Shell Components with A Sharp Change in the Property at Welded Joints

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

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