The additive production of metallic components with high-throughput is usually associated high process temperatures and slow cooling rates. This typically results in strongly oriented columnar grain growth along the building direction structure having exceedingly large sizes. As a result, such structures show low strength anisotropic mechanical behaviour as-deposited condition. Consequently, post-processing commonly performed to homogenize eventually increase properties deposited structures....

A finite element model is employed to perform a sequentially coupled thermo-mechanical analysis for enabling rapid process simulations of temperature fields, residual stresses and distortions the production additively manufactured parts via laser metal deposition. Experimental identification characteristic features such as distribution, melt pool dimensions bead geometries were used initial built-up calibration model. The addition material during simulation realised through reactivating...

The increasing interest of the aircraft industry in reduction structural weight aircrafts has resulted development lightweight and high-strength Al-Li alloys as well introduction laser beam welding to manufacturing process. objective this study is investigation influence variations chemical composition on local mechanical properties, like micro-hardness micro-tensile strength, CO 2 welded skin-stringer joints made from AA2196 AA2198. Additionally process weld chemistry studied view...

The anisotropy effect on tensile mechanical properties of an Al-Cu-Li (2198) alloy with regard to thickness the specimens under different ageing conditions was investigated. Occurring size effects between macro and micro (0.5, 3.2 5.0 mm 10 50 gauge length) discussed. behavior AA2198 examined by taking into account experimental results from micro-flat standard specimens. Higher showed higher elongation at fracture values slightly lower yield stress properties. Anisotropy seems be T3...

Laser beam welding of similar and dissimilar joints made 7075-T6 5182-O sheets is conducted. A new approach the Helmholtz-Zentrum Geesthacht used to solve problems weldability softening. The microstructural characteristics mechanical properties are evaluated. With this information it possible initially assess formability tailored blanks. Finally welds will be validated via a sheet metal forming process. Owing good base materials, results obtained for welded compared with material properties.

Laser additive manufacturing (LAM) has become increasingly popular in industry recent decades because it enables exceptional degrees of freedom regarding the structural design lightweight components compared to subtractive techniques. metal deposition (LMD) wire-fed material shows particular advantages such as high process velocity and efficient use other LAM processes. During wire-based LMD, is deposited onto a substrate supplemented by successive layers allowing layer-wise production...

To meet the future demands of aerospace industry with respect to safety, productivity, weight, and cost, new materials joining concepts have being developed. Recent developments in metallurgical field now make it possible use laser-weldable Al-alloys 2xxx series such as AA2198 a high structural efficiency index due their strength low density. holds promise providing breakthrough response challenges lightweight design aircraft applications. Laser beam welding an efficient technology for...

Wire-based laser metal deposition enables to manufacture structures with very high rates in comparison powder-based additive manufacturing. However, this advantage is generally accompanied a energy input. Thus, an accumulation of heat within the structure can result. In addition, conduction conditions also change increasing height, leading inhomogeneous microstructural formation along part. The present study deals evolution microstructure and hardness deposited AA5087 wall structures....

Wire-based laser metal deposition enables to manufacture large-scale components with rates significant higher compared powder-based additive manufacturing techniques, which are currently working of only a few hundred gram per hour. However, the wire-based approach requires amount power in range several kilowatts instead watts for processes. This excessive heat input during can lead process instabilities such as non-uniform material and limited processability, respectively. Although, numerous...

Laser beam welding of butt joints made the newly developed high-strength Al-Zn alloy PA734 is conducted. A new approach Helmholtz-Zentrum Geesthacht used to solve problems weldability and softening. The results fatigue, fatigue crack propagation fracture toughness tests are discussed relating microstructural characteristics mechanical properties laser welded compared base material. obtained data can be for assessment damage tolerance behaviour integral aircraft structures alloys.

Weld defects - such as porosity and hot cracking occur especially during the laser beam welding of high-alloyed Al-Zn alloys. This significantly limits application range these promising high-strength In present study weldability different alloys was investigated regarding used parameters chemical composition addition, novel approach Helmholtz-Zentrum Geesthacht for overcoming problems applied to in order assess its capability. It shown that deteriorates with an increasing amount Zn, Mg Cu....

Up to now, only a limited amount of metallic materials is investigated for laser additive manufacturing (LAM). However, the demand widen application possibilities by enlarging range LAM growing fast. By titanium and aluminium alloys are in focus research. In contrast, magnesium rarely used field manufacturing, although they possess low density combination with high specific strength. Currently, structures mainly produced casting but during last years, use wrought also increased. A reason...

Powder-based laser metal deposition (LMD) of Ti alloys enables the manufacturing geometrical complex structures with tailored properties for high-temperature applications. The most important parameters LMD-process are power, process velocity, focus position, gas flow and powder feed rate. Compared to predominantly used Ti-6Al-4V, Ti-6Al-2Sn-4Zr-2Mo shows a higher oxidation resistance lower creep For determining suitable conditions, parameter study using is performed. Subsequent, transfer...