Integration of Heat Treatment with Shot Peening of 17-4 Stainless Steel Fabricated by Direct Metal Laser Sintering

JOM ◽  
2017 ◽  
Vol 69 (11) ◽  
pp. 2309-2313 ◽  
Author(s):  
Bandar AlMangour ◽  
Jenn-Ming Yang
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Shot Peening ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering

On three-dimensional printing of 17-4 precipitation-hardenable stainless steel with direct metal laser sintering in aircraft structural applications

2021 ◽  
pp. 146442072110448
Author(s):  
Rupinder Singh ◽  
Rishab ◽  
Jashanpreet S Sidhu
Keyword(s):  
Stainless Steel ◽  
Structural Engineering ◽  
Three Dimensional ◽  
Surface Hardness ◽  
Dimensional Accuracy ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Structural Components ◽  
Direct Metal Laser Sintering ◽  
Structural Applications

The martensitic 17-4 precipitation-hardenable stainless steel is one of the commercially established materials for structural engineering applications in aircrafts due to its superior mechanical and corrosion resistance properties. The mechanical processing of this alloy through a conventional manufacturing route is critical from the dimensional accuracy (Δ d) viewpoint for development of innovative structural components such as: slat tracks, wing flap tracks, etc. In past two decades, a number of studies have been reported on challenges being faced while conventional processing of 17-4 precipitation-hardenable stainless steel for maintaining uniform thickness of aircraft structural components. However, hitherto little has been reported on direct metal laser sintering of 17-4 precipitation-hardenable stainless steel for development of innovative functional prototypes with uniform surface hardness (HV), Δ d, and surface roughness ( Ra) in aircraft structural engineering. This paper reports the effect of direct metal laser sintering process parameters on HV, Δ d, and Ra for structural components. The results of study suggest that optimized settings of direct metal laser sintering from multifactor optimization viewpoint are laser power 100 W, scanning speed 1400 mm/s, and layer thickness 0.02 mm. The results have been supported with scanning electron microscopy analysis (for metallurgical changes such as porosity (%), HV, grain size, etc.) and international tolerance grades for ensuring assembly fitment.

scholarly journals Crystallographic Texture Analysis of As-Built and Heat-Treated Ti6Al4V (ELI) Produced by Direct Metal Laser Sintering

Crystals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 699
Author(s):  
Amos Muiruri ◽  
Maina Maringa ◽  
Willie du Preez
Keyword(s):  
Heat Treatment ◽  
Crystallographic Texture ◽  
Transformation Temperature ◽  
Electron Backscatter Diffraction ◽  
Laser Sintering ◽  
Reconstruction Method ◽  
Direct Metal Laser Sintering ◽  
Β Phase ◽  
Ebsd Data ◽  
Heat Treated

This paper reports on an investigation of crystallographic texture of as-built and heat-treated Ti6Al4V (ELI) produced by direct metal laser sintering (DMLS). The texture analyses were conducted using electron backscatter diffraction (EBSD). The β-phase texture from the obtained EBSD data was ascertained based on a reconstruction method using the Automatic Reconstruction of Parent Grain for EBSD data (ARPGE) program. A significant improvement of the maximum intensity of the texture from the pole figure was also noted upon heat treatment. The as-built samples and samples heat-treated just below the α→β transformation temperature showed a stronger fibrous texture of the reconstructed β-grains with the ⟨100⟩ directions almost parallel to the build direction. The alignment of the fibrous texture in the build direction disappeared after heat treatment above the α→β-grain transformation temperature.

scholarly journals Analysis of direct metal laser sintering ‒ DMLS and heat treatment influence on the Inconel 713C nickel alloy structure

2021 ◽  
Vol 93 (3) ◽  
pp. 49-56
Author(s):  
Jakub Ciftci ◽  
Ryszard Sitek ◽  
Jarosław Mizera
Keyword(s):  
Heat Treatment ◽  
Nickel Superalloy ◽  
Laser Sintering ◽  
Direct Metal Laser Sintering ◽  
Technological Parameters ◽  
Cast Material ◽  
Hardness Tests ◽  
Ni3al Phase ◽  
The Stability ◽  
Inconel 713C

The group of nickel based superalloys produced in the DMLS (Direct Metal Laser Sintering) process is limited to materials, which produced conventionally do not have properties to allow to use them for rotating components of aircraft engines. This work attempts to optimize the technological parameters of the DMLS process for the Inconel 713C nickel superalloy. A heat treatment was performed for selected samples to investigate the effect on the morphology of the Ni3Al phase. The microstructure analysis and hardness tests were carried out. The material after the DMLS process was characterized by the presence of much smaller dendrites than the cast material and exceeded its hardness. For the tested variants of heat treatment, the material was characterized by smaller sizes of the Ni3Al phase. In order to ensure the stability of the microstructure, an optimization of the dedicated heat treatment after the DMLS process is required, as the standard heat treatment for Inconel 713C cast nickel superalloy does not fully recrystallize the material.

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