Fatigue and Fracture Behaviour of Laser Powder Bed Fusion Stainless Steel 316L: Influence of Processing Parameters

Meng Zhang, Chen-Nan Sun, Xiang Zhang, Phoi Chin Goh, Jun Wei, David Hardacre, Hua Li

Research output: Contribution to journalArticle

23 Citations (Scopus)
138 Downloads (Pure)

Abstract

The laser powder bed fusion (L-PBF) process involves a large number of processing parameters. Extending the intricate relationship between processing and structure to mechanical performance is essential for structural L-PBF materials. The high cycle fatigue properties of L-PBF parts are very sensitive to process-induced porosities which promote premature failure through the crack initiation mechanisms. Results from this work show that for stainless steel 316L, porosity does not impinge on the high cycle fatigue properties when processing is kept within a ±30% tolerance band. In this ‘optimum’ processing region, crack initiation takes place due to defects at the solidification microstructure level. Beyond the ‘optimum’ processing region, over-melting and under-melting can lead to porosity-driven cracking and inferior fatigue resistance. In addition, regardless of the processing condition, fatigue resistance was found to follow a direct linear relationship with ductility and tensile strength in the low and high stress fatigue regimes respectively.
Original languageEnglish
Pages (from-to)251-261
Number of pages11
JournalMaterials Science and Engineering: A
Volume703
Early online date22 Jul 2017
DOIs
Publication statusPublished - 4 Aug 2017

Fingerprint

Stainless Steel
Powders
beds
stainless steels
Fusion reactions
Stainless steel
fusion
Fatigue of materials
Lasers
Processing
lasers
Porosity
crack initiation
porosity
Crack initiation
Melting
melting
cycles
ductility
tensile strength

Keywords

  • Selective laser melting
  • Laser powder bed fusion
  • Stainless steel 316L
  • Porosity
  • Fatigue property
  • Process window

Cite this

Fatigue and Fracture Behaviour of Laser Powder Bed Fusion Stainless Steel 316L: Influence of Processing Parameters. / Zhang, Meng; Sun, Chen-Nan; Zhang, Xiang; Goh, Phoi Chin; Wei, Jun; Hardacre, David; Li, Hua.

In: Materials Science and Engineering: A, Vol. 703, 04.08.2017, p. 251-261.

Research output: Contribution to journalArticle

Zhang, Meng ; Sun, Chen-Nan ; Zhang, Xiang ; Goh, Phoi Chin ; Wei, Jun ; Hardacre, David ; Li, Hua. / Fatigue and Fracture Behaviour of Laser Powder Bed Fusion Stainless Steel 316L: Influence of Processing Parameters. In: Materials Science and Engineering: A. 2017 ; Vol. 703. pp. 251-261.
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