PSI - Issue 42

Aditya Pandey et al. / Procedia Structural Integrity 42 (2022) 1017–1024

1019

Pandey et al. / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 1. IN718 powder Particle characteristics, (a, b) SEM micrographs and (c, d) size distribution.

Fig. 2. (a) Fatigue test sample, and (b) Tensile test sample.

(a)

(b)

Fig. 3. (a) Schematic of SLM process with build co-ordinate system, (b) scanning path strategy

2.3. Material testing

Tensile tests at room temperature were carried on as-build (AB) and heat-treated (HT) samples produced with 30 µ m layer thicknesses using the universal testing machine (UTM) at a strain rate of 10 − 3 s − 1 . Three tests were performed for each of the material condition and the average values were used for comparative analysis. Using an MTS Landmark servo-hydraulic test system with a 250 kN load cell, fully-reversed (R = -1) force-controlled axial fatigue tests were performed. The ASTM E466 standard was followed throughout tests and a sinusoidal waveform cyclic loading of frequency 10 Hz was used. Specimens having a life exceeding 10 7 cycles were considered as ran-out and the corresponding stress amplitude has been reported as its endurance limit at the given load-ratio.