Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (4): 539-550.DOI: 10.1007/s40195-019-00983-3
• Orginal Article • Previous Articles Next Articles
Chenfan Yu1, Yuan Zhong2, Peng Zhang3, Zhenjun Zhang3, Congcong Zhao1, Zhefeng Zhang3, Zhijian Shen1,2, Wei Liu1()
Received:
2019-05-11
Revised:
2019-08-10
Online:
2020-04-10
Published:
2020-04-15
Contact:
Wei Liu Chenfan Yu, Yuan Zhong, Peng Zhang, Zhenjun Zhang, Congcong Zhao, Zhefeng Zhang, Zhijian Shen, Wei Liu. Effect of Build Direction on Fatigue Performance of L-PBF 316L Stainless Steel[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(4): 539-550.
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Fig. 1 a Illustration of build orientation and loading direction of HB and VB samples; the loading direction is parallel to build direction for VB sample and the loading direction is vertical to build direction for HB sample; b size and geometry of sample for mechanical tests
Fig. 2 Microstructures of L-PBF 316L stainless steel built vertically: a lateral side (XZ plane); b top side (XY plane); c melt pool morphology; d cellular structures with different orientations near the melt pool boundary
Fig. 3 Electron backscatter diffraction (EBSD) inverse-pole figure (IPF) map of each side of as-built L-PBF 316L SS sample fabricated via different build orientations: a top side of VB sample; b top side of HB sample; c lateral side of VB sample; d lateral side of HB sample. Bottom: IPF legend
Fig. 4 a Tensile engineering strain-stress curves of 316L SS fabricated by L-PBF; bS-N curves showing the relationship between fatigue life (Nf) and total stress amplitude (Δσ/2) of 316L SS specimens fabricated with different build orientations
Fig. 6 Fatigue fracture surfaces of L-PBF 316L SS: a horizontally built specimen, Δσ = 400 MPa, Nf = 24,713 cycles; b vertically built specimen, Δσ = 300 MPa, Nf = 253,003 cycles; c, d typical fatigue striations morphologies of a and b, respectively
Fig. 7 Morphologies and distributions of pore defects detected by X-ray diffraction topography (XRT): a HB sample; b VB sample; insets c and d are magnified views of defects in a and b; e histograms of the defect size distribution in the HB and VB samples
Fig. 8 Fatigue striations morphologies on fatigue propagation region: a HB sample; b VB sample. The black arrows point to the fatigue growth direction
Fig. 9 Illustration of fatigue crack propagation path and typical columnar grains: a VB sample; b HB sample. The double-headed arrow indicates the applied loading direction
Fig. 10 Fatigue crack initiation regions: a, b fatigue crack initiated at the surface of the tested sample; c fatigue crack initiated at the pore defect
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