Directed Energy Deposition of AISI 316L Stainless Steel Powder: Effect of Process Parameters

Aversa, Alberta; Marchese, Giulio; Bassini, Emilio

doi:10.3390/met11060932

Cited by 37 publications

(17 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, the results of the numerical simulation can be affected by the degradation. Since the failure is indicated in the element of Finite Element (FE) mesh, the degradation manifesting itself as a decrease of elastic modulus is triggered according to Equation (14). Once the critical value D crit = 1 is reached in the element, this element is removed from the FE mesh.…”

Section: Computational Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

View full text Add to dashboard Cite

Additive manufacturing (AM) becomes a more and more standard process in different fields of industry. There is still only limited knowledge of the relationship between measured material data and the overall behaviour of directed energy deposition (DED)-processed complex structures. The understanding of the structural performance, including flow curves and local damage properties of additively manufactured parts by DED, becomes increasingly important. DED can be used for creating functional surfaces, component repairing using multiple powder feeders, and creating a heterogeneous structure with defined chemical composition. For thin parts that are used with the as-deposited surface, this evaluation is even highly crucial. The main goal of the study was to predict the behaviour of thin-walled structures manufactured by the DED process under static loading by finite element analysis (FEA). Moreover, in this study, the mechanical performance of partly machined and fully machined miniaturized samples produced from the structure was compared. The structure studied in this research resembles a honeycomb shape made of austenitic stainless steel AISI 316L, which is characterized by high strength and ductility. The uncoupled damage models based on a hybrid experimental-numerical approach were used. The microstructure and hardness were examined to comprehend the structural behaviour.

show abstract

Section: Computational Modelsmentioning

confidence: 99%

“…The results suggest that the deposition parameters affect the cell size of the cellular structure created during the process. In addition, the parts manufactured applying lower power value were distinguished by higher strength and higher porosity [14].…”

Section: Introductionmentioning

confidence: 98%

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In the last few years, extensive valuable outcomes have contributed to our understanding of the correlations of the process parameters, microstructure and mechanical properties of DED-fabricated components [12][13][14][15]. However, most of those available studies discuss deposition at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Elevated Temperature Baseplate Effect on Microstructure, Mechanical Properties, and Thermal Stress Evaluation by Numerical Simulation for Austenite Stainless Steel 316L Fabricated by Directed Energy Deposition

et al. 2022

View full text Add to dashboard Cite

In the present study, the effect of material deposition at the elevated temperature baseplate on the microstructure and mechanical properties was investigated and correlated to the unique thermal history by using numerical simulation. Numerical results agreed well with the experimental results of microstructure and mechanical properties. Numerical results revealed a significant decrease in temperature gradient and a 40% decrease in thermal stress due to material deposition on the elevated temperature baseplate. The reduced thermal stress and temperature gradient resulted in coarser grain features, which in turn led to a decrease in hardness and tensile strength, especially for the bottom region near the baseplate. Meanwhile, no significant effect could be found for ductility. In addition, an elevated temperature baseplate promoted less heterogeneity in hardness and tensile properties along the building direction. The current work demonstrates a collective and direct understanding of the baseplate preheating effect on thermal stress, microstructure and mechanical properties and their correlations, which is believed beneficial for the better utilization of baseplate preheating positive effects.

show abstract

“…Although the wear resistance increases with the nitriding temperature, the corrosion resistance decreases. This type of 316L steel is mainly used in many industries and the fields of biomaterials [25][26][27]. Lin et al investigated the antibacterial rate to recognize the antibacterial effect of the S phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering

Kovács

Kemény

2021

Acta Metall Slovaca

View full text Add to dashboard Cite

A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using a wide range of different metals as raw materials. The aim of current research is to investigate the plasma nitriding effect on the DMLS produced samples. The direct current plasma nitriding treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before the treatment, the 316L austenitic stainless steels samples were ground with different methods to modify the surface roughness. Scanning electron microscope (SEM), X-ray diffractometer, glow discharge optical electron spectroscopy, Vickers microhardness tester and potentiodynamic corrosion test were used for the characterization of surface properties. The results demonstrated that the surface roughness did not affect the outcome of the plasma nitriding, but the corrosion resistance increases with the decrease of the surface roughness compared to the untreated 3D sample.

show abstract

Directed Energy Deposition of AISI 316L Stainless Steel Powder: Effect of Process Parameters

Cited by 37 publications

References 37 publications

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

Elevated Temperature Baseplate Effect on Microstructure, Mechanical Properties, and Thermal Stress Evaluation by Numerical Simulation for Austenite Stainless Steel 316L Fabricated by Directed Energy Deposition

Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering

Contact Info

Product

Resources

About