Effect of Cu content on hot-crack resistance of Al-Cu-Mg alloys produced by laser powder bed fusion

Belelli, Filippo; Casati, Riccardo; Vedani, Maurizio

doi:10.1080/09500839.2021.2024616

Cited by 6 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although process parameters optimization is a fundamental step before proceeding with the production of a component, it is usually not enough to completely solve the hot tearing problem. A widely used strategy to avoid the formation of hot-cracks consists of the modification of the original alloy, either by adding elements that increase the amount of liquid available in the last stages of solidification, by promoting eutectic formation [13], or by the introduction of nano-inoculants [14,15]. Generally, the latter approach is preferred since the eutectic formation implies a heavy change in the alloy chemical composition and affects the material properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of a High-Strength Zr-Ti-Modified 2139 Aluminum Alloy for Laser Powder Bed Fusion

Larini

Casati

Marola

et al. 2023

Metals

Self Cite

View full text Add to dashboard Cite

The demand for high-performance aluminum components drives research into the design of novel alloys that can be processed by laser-based additive manufacturing. In recent years, the addition of grain refiners proved to be an effective strategy to reduce the hot-cracking of high-strength Al alloys. In this study, the solidification and aging behavior of an Al2139 alloy doped with additions of Zr and Ti for L-PBF was investigated. These elements favored the formation of a fine-grained structure free of cracks. The formation of Al3(Zr,Ti) inoculants was predicted by Scheil simulations and observed as cuboidal particles in the center of α-Al grains. The microstructure of the as-built material featured fine and fully equiaxed grains, which appeared comparatively finer at the edge (300–600 nm) and coarser (0.8–2.0 μm) at the center of the molten pools. In both cases, there was evidence of Cu and Mg micro-segregations at the grain boundaries. The microhardness of 109.7 HV0.5 in the as-built state was increased to 186.1 HV0.5 after optimized T4 heat treatment, responsible for the precipitation of many rod-shaped Zr- and Ti-based second phases and quasi-spherical Cu-, Mn-, and Fe-rich particles. Prolonged exposure carried out to simulate high-temperature service caused a drop in microhardness and marked modification of the microstructure, evidenced by the rearrangement and subsequent spheroidization of Cu- and Mg-rich particles at the grain boundaries.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of a High-Strength Zr-Ti-Modified 2139 Aluminum Alloy for Laser Powder Bed Fusion

Larini

Casati

Marola

et al. 2023

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Interestingly, nano-particles have been found to be very effective 19,20 , which is not the case in cast alloys. The modifications to the solidification path have also been used to improve the not tear susceptibility through the addition of elements to increase the final eutectic volume and improve feeding, although the intermetallics also seem to have a role in coalescing the microstructure also benefiting hot tearing 14,21,22 .…”

mentioning

confidence: 99%

In situ observation and reduction of hot-cracks in laser additive manufacturing

Chen,

Zhang,

O’Toole

et al. 2024

Commun Mater

View full text Add to dashboard Cite

Cracking during Laser Additive Manufacturing is a problem for many higher-strength aluminium alloys, including AA6061. Here, we used a pulsed laser with ramp-down power modulation to improve the cracking resistance by about 50% compared to the use of a rectangular pulsed laser. Using synchrotron in situ X-ray imaging at 100,000 images s−1, ground truth data was obtained about changes in melt pool geometry, solidification rate, and thermal gradients were calculated. An analytical hot cracking model was developed to show that these changes lead to a decreased hot tear susceptibility. Therefore, laser pulse modulation can be an effective tool to reduce crack susceptibility of alloys. More fundamentally, the results demonstrate that modifying thermal conditions provides a pathway to crack elimination in LAM and the model established in our study sets the foundation for further complex laser manipulation in modifying the printability and resulting mechanical properties of hard-to-process alloys in Laser Additive Manufacturing.

show abstract

Composition design method of Al-Cu alloy for laser powder bed fusion

Zhang

et al. 2022

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Effect of Cu content on hot-crack resistance of Al-Cu-Mg alloys produced by laser powder bed fusion

Cited by 6 publications

References 14 publications

Microstructural Evolution of a High-Strength Zr-Ti-Modified 2139 Aluminum Alloy for Laser Powder Bed Fusion

Microstructural Evolution of a High-Strength Zr-Ti-Modified 2139 Aluminum Alloy for Laser Powder Bed Fusion

In situ observation and reduction of hot-cracks in laser additive manufacturing

Composition design method of Al-Cu alloy for laser powder bed fusion

Contact Info

Product

Resources

About