Microstructure and mechanical properties of the heat-affected zone in laser-welded/brazed steel 22MnB5–AA6016 aluminum/AZ31 magnesium alloy

Windmann, M.; Röttger, Arne; Kügler, H.; Theisen, W.

doi:10.1016/j.jmatprotec.2017.04.008

Cited by 27 publications

(5 citation statements)

References 18 publications

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“…Windmann et al demonstrated that the strength of the HAZ decreases after the welding process from 1,500 MPa to 950 ± 150 MPa for the 22MnB5 sheet. The area directly beside the welding zone, where the highest heat occurs and which shows the lowest strength, is particularly critical (Windmann et al , 2017). For shear tensile tests, the part with the weakest tensile strength will initiate an early part failure.…”

Section: Resultsmentioning

confidence: 99%

Developing laser beam welding parameters for the assembly of steel SLM parts for the automotive industry

Fieger

Sattler²,

Witt

2018

RPJ

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Purpose This paper aims to identify issues with joining selective laser melting (SLM) steels with conventional cold rolled steels through remote laser beam welding. Design/methodology/approach A novel approach for substituting conventional cold rolled metal sheets with SLM metal sheets, made of 316L and 18-Ni 300, is presented. The characteristics of the interaction of wrought and SLM materials are described, and joining benchmark parameters are presented and compared to known existing joining results. Finally, the joints are assessed in line with automotive specifications. This research also addresses the importance of joining technologies for the implementation of SLM as a full-fledged manufacturing technology for the automotive industry. Findings New parameter ranges for laser beam welding of SLM steels are defined. Research limitations/implications This research is limited to the examined steels and the used machines, parameters and equipment. Practical implications The presented benchmark parameters are expected to be useful for designers, product developers and machine operators. Originality/value Little knowledge is available about the behavior of SLM materials and their suitability for assembly processes. Novel information about SLM steels and their interaction with conventionally produced steel sheets is presented.

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Section: Resultsmentioning

confidence: 99%

Developing laser beam welding parameters for the assembly of steel SLM parts for the automotive industry

Fieger

Sattler²,

Witt

2018

RPJ

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“…There are many welding methods for dissimilar metals, such as friction stir welding [15], explosion welding [16], gas tungsten arc welding (GTAW) [17], and laser welding [18,19]. The advantages of laser welding are a high energy density, concentrated energy, easy control of the heat source, deep weld seam, small welding deformation, and high efficiency, which are promising for aluminum/steel dissimilar welding [20][21][22]. Yang et al [19] studied the association between laser power, interfacial microstructure, and joint strength of Al/Al-Si coated 22MnB5 steel joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al-Si Coating on the Interfacial Microstructure and Corrosion Resistance of Dissimilar Laser Al Alloy/22MnB5 Steel Joints

Wu,

Oliveira,

Yang

et al. 2024

Metals

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This investigation employed different laser powers to conduct the laser welding–brazing process of 5052 aluminum alloy to both Al-Si coated and uncoated 22MnB5 steel. The flux-cored Zn-Al22 filler metal was employed during the procedure. The influence of Al-Si coatings on the microstructure and corrosion resistance of Al/Steel welded joints was investigated using microstructural characterization and electrochemical tests. It was noted that the interfacial microstructure of the laser Al/steel joints was significantly altered by the Al-Si coating. Moreover, the Al-Si coating suppressed the formation and growth of the interfacial reaction layer. Electrochemical corrosion tests showed that the impact of Al-Si coating on the corrosion resistance of laser joints depended on the laser powers and thickness of the interfacial intermetallic compound (IMC) layer. The research suggests that galvanic corrosion occurs due to the differences in corrosion potential between fusion zone (FZ), steel, and Fe-Al-Zn IMCs, which accelerate the corrosion of the joint. The IMC layer acts as a cathode to accelerate the corrosion of the FZ and as an anode to protect the steel from corrosion.

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“…The same is for Mg-Zn-Zr magnesium alloys (ZK series); although they have obtained good comprehensive mechanical properties by refining the grains with the addition of Zr element, the melting points of the major precipitates in the alloys such as MgZn, MgZn 2 (laves phase) and Mg 2 Zn 3 are just 342°C 8 , 808°C 9 and 416°C 8 , respectively, indicating the poor heat resistance as well. These less thermally stable precipitates in heat-affected zone easily melt and re-aggregate, forming coarse-sized precipitates at grain boundaries during the brief welding thermal cycle 10 , which in turn has a typical splitting effect on the matrix during plastic deformation due to the huge difference in elastic constants with the matrix 11 . Moreover, the original well-designed, finely distributed precipitates are drastically reduced because of the thermal melting or dissolution, thus weakening the initial precipitation strengthening or precipitated-phase strengthening of the matrix 12 .…”

Section: Introductionmentioning

confidence: 99%

Study on the Strengthening Mechanism of Rare-Earth Element Ce on the Laser Welded Joints of Magnesium Alloys

2022

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The thermomechanical stability of majority precipitates formed by conventional alloying elements in magnesium alloys is generally poor. Hence the morphology and structure of these precipitates are highly susceptible to the welding thermal cycle, which results in the softening of the heat-affected zone (HAZ). Rare-earth (RE) precipitates are generally thermodynamically stable. Therefore, it is necessary to conduct an in-depth discussion on whether RE precipitates reduce the softening of the HAZ. In this paper, Ce-containing magnesium alloy was successfully welded by fiber laser welding. Scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), and micro-hardness tester were employed to analyze the welded joints. Consequently, the distribution characteristics of RE precipitates in both fusion zone (FZ) and HAZ were revealed. Moreover, based on the solution experiments of the welded joints, the evolution mechanism of the precipitates in welded joints during the thermal cycle was deduced, and the softening mechanism of the HAZ was clarified. Thereafter, the relative intrinsic mechanism of RE precipitates in reducing the softening of the HAZ and improving the mechanical properties of FZ was explored. The results showed that the HAZ was narrow, with a width of only 100-200 μm. The morphology and distribution of the less thermally stable Mg 17 Al 12 precipitated in HAZ changed significantly after the thermal cycle. In contrast, RE precipitates remained stable, which is extremely important for reducing the softening of the HAZ. In addition, the precipitates in FZ were transformed into micron-sized particles and precipitated at the edge of dendrites, resulting in a hardness improvement of the FZ.

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Microstructure and mechanical properties of the heat-affected zone in laser-welded/brazed steel 22MnB5–AA6016 aluminum/AZ31 magnesium alloy

Cited by 27 publications

References 18 publications

Developing laser beam welding parameters for the assembly of steel SLM parts for the automotive industry

Developing laser beam welding parameters for the assembly of steel SLM parts for the automotive industry

Effect of Al-Si Coating on the Interfacial Microstructure and Corrosion Resistance of Dissimilar Laser Al Alloy/22MnB5 Steel Joints

Study on the Strengthening Mechanism of Rare-Earth Element Ce on the Laser Welded Joints of Magnesium Alloys

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