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Cyclic plasticity and LCF behavior of AISI 316L austenitic stainless steel manufactured by selective laser melting (SLM)

Cylindrical net shape specimens were manufactured by selective laser melting (SLM) from 316L austenitic stainless steel recycled powder in vertical orientation with a relative density higher than 99.65%. Fatigue test specimens in as-built state without any post-heat treatment were cyclically strained in symmetrical push-pull (Rε = –1) with three different constant total strain amplitudes of 0.4%, 0.5% and 0.8% at room temperature. Fatiguing at all strain amplitudes resulted in permanent cyclic softening the intensity of which decreased with decreasing applied strain amplitude. Two distinctive stages of cyclic softening, namely a short period of initial intensive softening followed by a mild, long-term softening up to the end of fatigue life, are discussed in…

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Cylindrical net shape specimens were manufactured by selective laser melting (SLM) from 316L austenitic stainless steel recycled powder in vertical orientation with a relative density higher than 99.65%. Fatigue test specimens in as-built state without any post-heat treatment were cyclically strained in symmetrical push-pull (Rε = –1) with three different constant total strain amplitudes of 0.4%, 0.5% and 0.8% at room temperature. Fatiguing at all strain amplitudes resulted in permanent cyclic softening the intensity of which decreased with decreasing applied strain amplitude. Two distinctive stages of cyclic softening, namely a short period of initial intensive softening followed by a mild, long-term softening up to the end of fatigue life, are discussed in terms of microstructural changes and deformation mechanisms occurring in the virgin as-built cellular/columnar subgrain microstructure with embedded spherical oxide nano-particles as documented by electron channeling contrast imaging (ECCI) technique in SEM and with a high resolution by transmission electron microscopy (TEM) in the bulk of fatigued SLMed material.

Reference
LCF9-2022-077

Title
Cyclic plasticity and LCF behavior of AISI 316L austenitic stainless steel manufactured by selective laser melting (SLM)
Author(s)
J. Man, I. Šulák, A. Chlupová, L. Douša, J. Polák
DOI
10.48447/LCF9-2022-077
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
Selective laser melting,Low cycle fatigue,Austenitic stainless steel,Dislocation microstructure,Transmission electron microscopy (TEM)