PSI - Issue 61

Aptullah Karakaş et al. / Procedia Structural Integrity 61 (2024) 42 – 46 Aptullah Karakas/ Structural Integrity Procedia 00 (2019) 000 – 000

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4

a)

b)

c)

d)

Figure 3: Cross sectional optical micrographs of the samples; a) hot-dip aluminized AISI 4140 steel (4140 HDA), b) Flow-formed and hot-dip aluminized AISI 4140 steel (FF 4140 HDA), c) hot-dip aluminized and diffusion annealed AISI 4140 steel (4140 HDA-DA) and d) Flow-formed, hot-dip aluminized and diffusion annealed AISI 4140 steel (FF 4140 HDA-DA).

Table 1: The values of coating thickness and coating hardness of aluminized samples

Coating Thickness (µm)

Coating Hardness (HV)

Sample

4140 HDA

50-60

1100-1200

4140 HDA-DA

320-350

1000-1100

FF 4140 HDA

80-90

1100-1200

FF 4140 HDA-DA

420-480

1000-1100

According to results of hardness values and coating thicknesses of the aluminized samples, it could be concluded that cold plastic deformation has a major effect on coating thickness because the FF 4140 HDA specimen has a 30 µm thicker coating than 4140 HDA specimen. For the diffusion annealed samples, the difference is more than 100 µm.