scholarly journals Tensile Properties of 21-6-9 Austenitic Stainless Steel Built Using Laser Powder-Bed Fusion

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4280
Author(s):  
Magnus Neikter ◽  
Emil Edin ◽  
Sebastian Proper ◽  
Phavan Bhaskar ◽  
Gopi Krishna Nekkalapudi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
High Strength ◽  
Industrial Applications ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Anisotropic Behavior ◽  
Powder Bed

Alloy 21-6-9 is an austenitic stainless steel with high strength, thermal stability at high temperatures, and retained toughness at cryogenic temperatures. This type of steel has been used for aerospace applications for decades, using traditional manufacturing processes. However, limited research has been conducted on this alloy manufactured using laser powder-bed fusion (LPBF). Therefore, in this work, a design of experiment (DOE) was performed to obtain optimized process parameters with regard to low porosity. Once the optimized parameters were established, horizontal and vertical blanks were built to investigate the mechanical properties and potential anisotropic behavior. As this alloy is exposed to elevated temperatures in industrial applications, the effect of elevated temperatures (room temperature and 750 °C) on the tensile properties was investigated. In this work, it was shown that alloy 21-6-9 could be built successfully using LPBF, with good properties and a density of 99.7%, having an ultimate tensile strength of 825 MPa, with an elongation of 41%, and without any significant anisotropic behavior.

Fracture toughness of 304L austenitic stainless steel produced by laser powder bed fusion

2021 ◽  
Vol 202 ◽  
pp. 114002
Author(s):  
Punit Kumar ◽  
Zhiguang Zhu ◽  
Sharon M.L. Nai ◽  
R.L. Narayan ◽  
U. Ramamurty
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Characterization of single crystalline austenitic stainless steel thin struts processed by laser powder bed fusion

2019 ◽  
Vol 163 ◽  
pp. 51-56 ◽  
Author(s):  
X. Wang ◽  
J.A. Muñiz-Lerma ◽  
O. Sanchez-Mata ◽  
M. Attarian Shandiz ◽  
N. Brodusch ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Single Crystalline ◽  
Powder Bed

scholarly journals Development of a Novel High-Temperature Al Alloy for Laser Powder Bed Fusion

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 35
Author(s):  
Filippo Belelli ◽  
Riccardo Casati ◽  
Martina Riccio ◽  
Alessandro Rizzi ◽  
Mevlüt Y. Kayacan ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Elevated Temperatures ◽  
High Strength ◽  
Al Alloy ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Solidification Cracks ◽  
Manufacturing Technologies

The number of available materials for Laser Powder Bed Fusion is still limited due to the poor processability of many standard alloys. In particular, the lack of high-strength aluminium alloys, widely used in aerospace and automotive industries, remains a big issue for the spread of beam-based additive manufacturing technologies. In this study, a novel high-strength aluminium alloy for high temperature applications having good processability was developed. The design of the alloy was done based on the chemical composition of the widely used EN AW 2618. This Al-Cu-Mg-Ni-Fe alloy was modified with Ti and B in order to promote the formation of TiB2 nuclei in the liquid phase able to stimulate heterogeneous nucleation of grains and to decrease the hot cracking susceptibility of the material. The new Al alloy was manufactured by gas atomisation and processed by Laser Powder Bed Fusion. Samples produced with optimised parameters featured relative density of 99.91%, with no solidification cracks within their microstructure. After aging, the material revealed upper yield strength and ultimate tensile strength of 495 MPa and 460 MPa, respectively. In addition, the alloy showed tensile strength higher than wrought EN AW 2618 at elevated temperatures.

scholarly journals Microstructure-Property Relationships in Powder Bed Fusion of Type 304L Austenitic Stainless Steel

2018 ◽  
Author(s):  
Chris San Marchi ◽  
Joshua D. Sugar ◽  
Thale R. Smith ◽  
Dorian K. Balch
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Tensile Properties ◽  
Bulk Material ◽  
Powder Bed Fusion ◽  
Powder Bed ◽  
Relative Porosity ◽  
Near Net Shape ◽  
Properties Of Materials

Additive manufacturing (AM) includes a diverse suite of innovative manufacturing processes for producing near-net shape metallic components, typically from powder or wire. Reported mechanical properties of materials produced by these processes varies significantly and can usually be correlated with the relative porosity in the materials. In this study, relatively simple test components were manufactured from type 304L austenitic stainless steel by powder bed fusion (PBF). The quality of the components depends on a host of manufacturing parameters as well as the characteristics of the feedstock. In this study, the focus is the bulk material response. Tensile properties are reported for PBF type 304L produced in similar build geometries on two different machines with independent operators. Additionally, the effect of hydrogen on the tensile properties of the AM materials is evaluated. The goal of this study is to provide a benchmark for tensile properties of PBF 304L material in the context of wrought type 304L, and to make a preliminary assessment of the effects of hydrogen on tensile properties.

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