scholarly journals Speeding up Additive Manufacturing by Means of Forming for Sheet Components with Core Structures

2021 ◽  
Author(s):  
Stephan Rosenthal ◽  
Marlon Hahn ◽  
A. Erman Tekkaya ◽  
Sebastian Platt ◽  
Stefan Kleszczynski ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Production Efficiency ◽  
Stainless Steel 316L ◽  
Process Route ◽  
New Process ◽  
Process Combination ◽  
Sandwich Sheets

AbstractA new process combination route consisting of additive manufacturing (AM) with a subsequent forming operation is proposed. The process route has the opportunity to increase the efficiency of the AM process route up to 360%. Stainless steel 316L sheets with different core structures (similar to sandwich sheets) are produced by AM, characterized, and formed in a die bending operation. The bending characteristics of this novel semi-finished product can be accurately predicted in a numerical simulation. The new process route is discussed in detail and compared to conventional AM parts in terms of the production efficiency.

scholarly journals 316L Stainless Steel Powders for Additive Manufacturing: Relationships of Powder Rheology, Size, Size Distribution to Part Properties

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5537
Author(s):  
Robert Groarke ◽  
Cyril Danilenkoff ◽  
Sara Karam ◽  
Eanna McCarthy ◽  
Bastien Michel ◽  
...  
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Optical Microscope ◽  
Stainless Steel 316L ◽  
Powder Morphology ◽  
Size And Shape ◽  
Powder Rheology ◽  
Powder Properties ◽  
Particle Size And Shape

Laser-Powder Bed Fusion (L-PBF) of metallic parts is a highly multivariate process. An understanding of powder feedstock properties is critical to ensure part quality. In this paper, a detailed examination of two commercial stainless steel 316L powders produced using the gas atomization process is presented. In particular, the effects of the powder properties (particle size and shape) on the powder rheology were examined. The results presented suggest that the powder properties strongly influence the powder rheology and are important factors in the selection of suitable powder for use in an additive manufacturing (AM) process. Both of the powders exhibited a strong correlation between the particle size and shape parameters and the powder rheology. Optical microscope images of melt pools of parts printed using the powders in an L-PBF machine are presented, which demonstrated further the significance of the powder morphology parameters on resulting part microstructures.

Investigation of Functional Graded Steel Parts Produced by Selective Laser Melting

2019 ◽  
Vol 822 ◽  
pp. 563-568
Author(s):  
Vadim Sufiiarov ◽  
Evgenii Borisov ◽  
Igor A. Polozov
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Transition Layer ◽  
Hot Isostatic Pressing ◽  
Structure And Properties ◽  
Stainless Steel 316L ◽  
Laser Melting

The article presents the results of a study on the additive manufacturing of functional graded steel parts. Studies have been carried out on the possibility of growing blanks from two steels simultaneously – tool steel H13 and stainless steel 316L. The study of the microstructure of the transition from one steel to another showed that the transition layer is smooth and is about 200 microns thick. The mechanical properties in the transition layer are distributed over the gradient and smoothly change from one material to another. The structure and properties of the transition layer after heat treatment and hot isostatic pressing are shown.

scholarly journals Austenitic Stainless Steel Powders with Increased Nitrogen Content for Laser Additive Manufacturing

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 61 ◽  
Author(s):  
Chengsong Cui ◽  
Volker Uhlenwinkel ◽  
Alwin Schulz ◽  
Hans-Werner Zoch
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Austenitic Stainless Steel ◽  
Nitrogen Content ◽  
Austenitic Stainless Steels ◽  
Nitrogen Atmosphere ◽  
Stainless Steel 316L ◽  
Laser Additive Manufacturing ◽  
Increase Nitrogen Content ◽  
Mechanical Properties And Corrosion

Nitrogen is used as an alloying element, substituting the expensive and allergenic element nickel, in austenitic stainless steels to improve their mechanical properties and corrosion resistance. The development of austenitic stainless steel powders with increased nitrogen content for laser additive manufacturing has recently received great interest. To increase nitrogen content in the austenitic steel powders (for example AISI 316L), two measures are taken in this study: (1) melting the steel under a nitrogen atmosphere, and (2) adding manganese to increase the solubility of nitrogen in the steel. The steel melt is then atomized by means of gas atomization (with either nitrogen or argon). The resulting powders are examined and characterized with regard to nitrogen content, particle size distribution, particle shape, microstructure, and flowability. It shows that about 0.2–0.3 mass % nitrogen can be added to the austenitic stainless steel 316L by adding manganese and melting the steel under nitrogen atmosphere. The particles are spherical in shape and very few satellite particles are observed. The steel powders show good flowability and packing density, therefore they can be successfully processed by means of laser powder bed fusion (L-PBF).

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