Relationship between manufacturing defects and fatigue properties of additive manufactured austenitic stainless steel

Tensile properties, fatigue crack initiation, fatigue crack growth rate, and fatigue life are evaluated in 304L austenitic stainless steel fabricated by directed energy deposition (DED). Large lack of fusion (LoF) defects (often >1 mm in length) significantly reduce ultimate tensile strength and...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-09, Vol.765 (C), p.138268, Article 138268
Hauptverfasser:	Smith, Thale R., Sugar, Joshua D., Schoenung, Julie M., San Marchi, Chris
Format:	Artikel
Sprache:	eng
Schlagworte:	Acceleration Additive manufacturing (AM) Austenitic stainless steel Austenitic stainless steels Crack initiation Crack propagation Fatigue Fatigue failure Fatigue life Fatigue strength Fracture mechanics Manufacturing defects MATERIALS SCIENCE Metal fatigue Stainless steel Tensile properties Tensile strength Ultimate tensile strength
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Zusammenfassung:	Tensile properties, fatigue crack initiation, fatigue crack growth rate, and fatigue life are evaluated in 304L austenitic stainless steel fabricated by directed energy deposition (DED). Large lack of fusion (LoF) defects (often >1 mm in length) significantly reduce ultimate tensile strength and ductility, as well as accelerate fatigue crack initiation and reduce fatigue life. In comparison, small spherical defects (
ISSN:	0921-5093 1873-4936
DOI:	10.1016/j.msea.2019.138268