PSI - Issue 47

8

Abdullah Al-Ibrahim et al. / Procedia Structural Integrity 47 (2023) 426–436 Abdullah Al-Ibrahim/ Structural Integrity Procedia 00 (2023) 000–000

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Figure 10 Digital Microscope image of S21

Figure 11 Digital Microscope image of S21-A

S37, S37-A, S39, and S39-A microstructure images are shown in Figures (12), (13), (14), and (15) respectively. Comparing S37, and S37-A where the contact load is 1400N, it can be seen the major wear mechanism is abrasive wear. Moreover, it can be seen the solid particles from the lubricant are present in both samples. Adhesive wear can be found under rotational only, and abrasive wear has deep groves. On the other hand, when sliding and rotational are combined, it can be found adhesive wear is not present and the abrasive wear will have smooth grooves on the worn surface. By comparing S39, and S39-A where the contact load is 1000N, it can be obtained that the