17-4 PHSS: In solution treated condition it will have of a martensitic phase supersaturated with carbon and copper. It may have retained austenite less than 2-4% depending on the annealing temperature or prior austenite grain size. Smaller the prior austenite grain, larger may be the volume fraction of retained austenite. The martensite will be of lath type.

Peak aging (480 deg. C, 1-4 h) will result in a tempered martensitic structure with carbide precipitation within the grains along the lath boundaries. Hardening is achieved by 'bcc' copper rich precipitates of size < 10 nm.

Overaging occurs during aging at 600 C. The precipitates are 'fcc' copper rich, and M23C6 type carbides incoherently present in the tempered martensitic matrix.

There are so many papers on this topic. You can also refer to stainless steel handbook by Peckner.

Thank you sir. I sincerely appreciate your suggestion.

These papers may be useful.

Laser Powder Bed Fusion of Precipitation-Hardened Martensitic Stainless Steels: A Review

Article Laser Powder Bed Fusion of Precipitation-Hardened Martensiti...

Article Nano-precipitates Evolution and Their Effects on Mechanical ...

Thank you Chaoqun Zhang for recommending papers, it was very helpful.