Nitrogen uptake of nickel free austenitic stainless steel powder during heat treatment-an XPS study

2014 ◽  
Vol 47 (3) ◽  
pp. 413-422 ◽  
Author(s):  
Anna Weddeling ◽  
Kathrin Lefor ◽  
Eduard Hryha ◽  
Stephan Huth ◽  
Lars Nyborg ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Nitrogen Uptake ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
Xps Study

Water Atomized 17-4 PH Stainless Steel Powder as a Cheaper Alternative Powder Feedstock for Selective Laser Melting

2018 ◽  
Vol 941 ◽  
pp. 698-703 ◽  
Author(s):  
Milad Ghayoor ◽  
Sunil B. Badwe ◽  
Harish Irrinki ◽  
Sundar V. Atre ◽  
Somayeh Pasebani
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Selective Laser Melting ◽  
Steel Powder ◽  
Melting Process ◽  
Stainless Steel Powder ◽  
Laser Melting ◽  
Austenitic Phase ◽  
Process Gas

Water atomized and gas atomized 17-4 PH stainless steel powder were used as feedstock in selective laser melting process. Gas atomized powder revealed single martensitic phase after printing and heat treatment. As-printed water atomized powder contained dual martensitic and austenitic phase. The H900 heat treatment cycle was not effective in enhancing mechanical properties of the water atomized powder after laser melting. However, after solutionizing at 1315 oC and aging at 482oC fully martensitic structure was observed with yield strength of 1000 MPa and ultimate tensile strength of 1261 MPa which are comparable to those of gas atomized, 1254 MPa and 1300 MPa, respectively. Improved mechanical properties in water atomized powder was found to be related to presence of finer martensite. Our results imply that water atomized powder is a promising cheaper feedstock alternative to gas atomized powder.

scholarly journals Microstructures of Laser Deposited 304L Austenitic Stainless Steel

2000 ◽  
Vol 625 ◽  
Author(s):  
John A. Brooks ◽  
Thomas J. Headley ◽  
Charles V. Robino
Keyword(s):  
Stainless Steel ◽  
Solid State ◽  
Austenitic Stainless Steel ◽  
Single Phase ◽  
Alloy Composition ◽  
Thermal Conditions ◽  
Steel Powder ◽  
Stainless Steel Powder ◽  
304L Stainless Steel ◽  
Transformation Mechanisms

AbstractLaser deposits fabricated from two different compositions of 304L stainless steel powder were characterized to determine the nature of the solidification and solid state transformations. One of the goals of this work was to determine to what extent novel microstructures consisting of single-phase austenite could be achieved with the thermal conditions of the LENS process. Although ferrite-free deposits were not obtained, structures with very low ferrite content were achieved. It appeared that, with slight changes in alloy composition, this goal could be met via two different solidification and transformation mechanisms.

Sign in / Sign up

Export Citation Format

Share Document