Analysis of microstructure of additively manufactured stainless steel

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Korznikova, G.F.^1 ; Tzibizova, T.N.^2 ; Sergeyev, S.N.^1 ; Smirnov, V.V.^2 ; Pavlinich, S.P.^2 ; Gunderov, D.V.^3,4 ; Khalikova, G.R.^1 ; Mulyukov, R.R.^1

Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 39 Khalturin st., Ufa

450001, Russia^1

Ufa State Aviation Technical University, 12 K. Marx st., Ufa

450008, Russia^2

Saint Petersburg State University, 28 Universitetskiy pr., Saint Petersburg

198504, Russia^3

Institute of Molecule and Crystal Physics - Subdivision, Ufa Federal Research Centre, Russian Academy of Sciences, 151 Prospekt Oktyabrya, Ufa

450075, Russia^4

关键词: Crystallographic textures;    Dislocation densities;    High angle grain boundaries;    High temperature gradient;    Non-equilibrium microstructure;    Retained austenite;    Selective laser sintering;    Ultrafine grained structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012019/pdf
DOI  :  10.1088/1757-899X/447/1/012019

来源: IOP

【 摘 要 】

Selective laser sintering was used for additive manufacturing of stainless steel parts. The microstructure of the initial powder and the as-processed part was investigated. It was found that high temperature gradients involved in selective laser sintering evolve non-equilibrium microstructures in the as fabricated state, e.g. retained austenite in martensite, significant dislocation density and residual stresses. The additively manufactured samples have an ultrafine grained structure with predominantly high angle grain boundaries and are free of a crystallographic texture and residual porosity.