This document discusses the microstructure of various powder metallurgy stainless steels. It shows optical microscope images of the microstructure of austenitic 316L stainless steel, ferritic 410S stainless steel, and duplex and ferritic stainless steels sintered at different temperatures. The microstructures show features like austenite grains, ferrite grains, porosity, twin bands, and chromium carbide precipitates. As sintering temperature increases, the porosity size decreases. The document also discusses sintered stainless steel components and scanning electron microscope images of 316L stainless steel powders.

1. Microstructure of Powder Metallurgy Stainless Steels
Dr.R.Narayanasamy, B.E., M.Tech., M.Engg., Ph.D., (D.Sc.)
Retired Professor,
Department of Production Engineering,
National Institute of Technology,
Tiruchirappalli-620015, Tamil Nadu, India.

4. Microstructure of stainless steel – 300 series A
Austenite
grain
Porosity
Twin band

5. Microstructure of a AISI 316L stainless steel
Porosity
Austenite
grain
Twin
band

6. Microstructure of AISI 410S ferritic stainless steel;
As received
Ferrite
grain
Grain
Boundary
Chromium Carbides precipitates on the grain boundaries

7. Optical microstructure of duplex a, ferritic b stainless steel, yttria-dispersed duplex c and
yttria-dispersed ferritic d stainless steel samples sintered at 1000° C in argon atmosphere (P
Pores)

8. Optical microstructure of duplex a, ferritic b stainless steel, yttria-dispersed duplex c and
yttria-dispersed ferritic d stainless steel samples sintered at 1200 ° C in argon atmosphere (P
Pores)

9. Optical microstructure of duplex a, ferritic b stainless steel, yttria-dispersed duplex c and
yttria-dispersed ferritic d stainless steel samples sintered at 1400° C in argon atmosphere
(P Pores)

10. Optical microstructure of duplex a, ferritic b stainless steel, yttria-dispersed duplex c and
yttria-dispersed ferritic d stainless steel samples sintered at 1000, 1200 and 1400° C in argon
atmosphere (P Pores)
As the sintering temperature increases, the porosity size decreases

11. Sintered Components in Stainless Steel

12. AMES manufacturer of sintered stainless steel parts

13. Scanning electron microscope (SEM) micrographs of (a) WA and (b) GA 316L stainless steel
powders

14. Microstructure and mechanical behavior of 316L stainless steel produced using sinter-based
extrusion additive manufacturing
Porosity Second phase particle
Grain boundary

15. Microstructure of a weld used in duplex stainless steel, 2205, 250X original magnification. A
color mixture of austenite, ferrite and sigma phases.

16. Microstructure of Austenitic Stainless Steel

17. Solutionized and hardened microstructure of AM specimens.

18. Solutionized and hardened microstructure of AM specimens.

22. Laser weld in stainless steel, unmounted, electrolytically polished with A2 and etched with
oxalic acid in water 10 %. Bright field.

23. 316L stainless steel | Desktop Metal

24. Thank You
References:
Authors of Technical articles and Scopus Journals are
Acknowledged.