Metallurgical and Mechanical Properties of Fusion Zones of TRIP Steels in Laser Welding

Xia, Mingsheng; Tian, Zhengkun; Zhao, Liguo; Zhou, Y.

doi:10.2355/isijinternational.48.483

Cited by 37 publications

(22 citation statements)

References 20 publications

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“…The laser beam power and focal position were 4.5 kW and 0 mm respectively. The mode of the laser was TEM 10 (Transversal Electronic-Magnetic) and the laser beam was passed through four reflectors before a 200 mm focal length focusing mirror providing a focused spot size of approximately 0.3 mm diameter. Butt joint configuration with the weld line oriented parallel to the rolling direction and full penetrations were obtained in all welds.…”

Section: Laser Beam Weldingmentioning

confidence: 99%

“…The effects of laser welding on the microstructures and mechanical properties of the TRIP steels had been evaluated and discussed in previous works. [10][11][12][13] The global mechanical behavior of the welds depends on the mismatch in mechanical properties between the different welded zones (WM, HAZ and BM), their dimensions and loading mode.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigation of Tensile Behavior of Laser Beam Welded TRIP700 Steel

Reisgen¹,

Schleser²,

Mokrov³

et al. 2011

ISIJ Int.

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Section: Laser Beam Weldingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Tensile Behavior of Laser Beam Welded TRIP700 Steel

Reisgen¹,

Schleser²,

Mokrov³

et al. 2011

ISIJ Int.

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“…The skeletal ferrite was believed to be beneficial to fusion zone ductility. 18) Higher magnification observation with SEM, Fig. 3(c), showed that the majority of the lathy products had the appearance of upper bainite and was about 65% of the fusion zone area.…”

Section: Methodsmentioning

confidence: 99%

Fusion Zone Microstructure Evolution of Al-Alloyed TRIP Steel in Diode Laser Welding

et al. 2008

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TRansformation Induced Plasticity (TRIP) steels are promising materials to achieve a better combination of formability and strength than conventional steels due to their unique microstructural makeup. Though welding is a vital part of auto body manufacturing, the weldability of TRIP steels has some complex and poorly understood features, which has served to retard the growth of its applications in the automotive industry. In this study, autogeneous welds were carried out on Al-alloyed TRIP steel using a 4 kW diode laser. Both fusion zone solidification behavior and subsequent austenite transformation products were investigated with optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. In terms of solidification behavior, fusion zones solidified with high temperature -ferrite as the primary phase. Fusion zone microstructure at room temperature was composed of ferrite with a skeletal morphology characteristic of solidification, and austenite decomposition products almost all having a lath morphology. Skeletal ferrite covered about 30% fusion zone area. Upper bainite laths separated by retained austenite films comprised most of the transformed microstructure, about 65% of the fused area. Lower bainite with carbide particles dispersed in an aligned way, chunk shaped retained austenite, lath martensite and twinned martensite were also occasionally observed. The Al content was considered to be for a dominant influence on fusion zone microstructure evolution.

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“…5,6) It can satisfy the welding requirements of UHSS theoretically. In this paper, a 4 kW Yb:YAG laser welding system is used to conduct the experiment, the lapwelding joints are made at different welding speed, joint morphology, microstructure, hardness, tensile-shear properties and fracture mode are analyzed and compared.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties of Ultra-high Strength Steel by Laser Welding

Han

et al. 2011

ISIJ Int.

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Based on the experiments of laser welding of ultra-high strength steel (UHSS), joint morphology, microstructure, hardness and tensile-shear properties are investigated. The results show that the defects such as gas holes and cracks do not appear in the weld metal if the optimized parameters are employed. Microstructures of the weld metal and HAZ are mainly martensite, the widths of martensite lath aren't sensitive to the welding speed. However, the welding speed affects the grain sizes of prior autensite of the weld metal. When changing the welding speed from 20 mm/s to 35 mm/s, the mean widths of prior austenite grains decrease from 10.67 μm to 7.68 μm. In the HAZ, the hardness decreases apparently for the soft ferrite appears. The test results also show that the joint tensile-shear strength can satisfy the demand of production. Consequently, the laser welding quality of UHSS is reliable for manufacturing.

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Metallurgical and Mechanical Properties of Fusion Zones of TRIP Steels in Laser Welding

Cited by 37 publications

References 20 publications

Numerical and Experimental Investigation of Tensile Behavior of Laser Beam Welded TRIP700 Steel

Numerical and Experimental Investigation of Tensile Behavior of Laser Beam Welded TRIP700 Steel

Fusion Zone Microstructure Evolution of Al-Alloyed TRIP Steel in Diode Laser Welding

Microstructures and Properties of Ultra-high Strength Steel by Laser Welding

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