PSI - Issue 2_B

Andrzej Kubit et al. / Procedia Structural Integrity 2 (2016) 3330–3336 A. Kubit et al./ Structural Integrity Procedia 00 (2016) 000 – 000

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3. Results Fig. 2 presents the surfaces of three variants of 51CrV4 steel specimens. On the surface of the shot peened specimen (Fig. 2c) there are visible small dimples caused by the plastic deformation of the shot impacts. When comparing the resulting surface roughness (Table 2.), it is evident that the maximum roughness, Ra = 2.810 µm and Rz = 12.8 µm, belongs to SP spring stee l. After heat treatment, the Ra and Rz parameters increase 2.1 times in comparison to the WT specimens.

Fig. 2. Photographs of 51CrV4 steel surfaces 25x zoom: (a) WT, (b) Q&T, (c) SP.

Table 2. Roughness profiles for 51CrV4 steel surfaces. Specimen designation

Roughness profile

WT

= 0.167 µm ,

= 1.197 µm

Q&T

= 0.353 µm ,

= 2.517 µm

SP

= 2.810 µm ,

= 12.800 µm