Issue 66

A. Shelar et alii, Frattura ed Integrità Strutturale, 66 (2023) 38-55; DOI: 10.3221/IGF-ESIS.66.03

for carrying out the Charpy impact test are shown in figure 2 c) and d) for all tempered conditions. The hardness values were recorded by using a Rockwell Hardness tester.

a)

b)

d)

c)

e)

f)

Sr. No.

Parameter

Values

1

Disc

EN32

2

Load

100N

3

Sliding Distance

2400m

4

Velocity

2m/sec

5

Hardness of Disc 62 HRC Table 3: Parameters for pin-disc test.

g)

Figure 2: a) Specimen prepared for tensile test b) Schematic diagram c) Specimen prepared for Charpy impact test d) Schematic diagram of specimen for Charpy impact test e) Specimen for optical and SEM f) Specimen for fractography g) Wear test setup Microstructure analysis The microstructures were prepared as per ASTM E3:2017/ASTM E-407-07e1(RA2015)/ASM handbook Vol. 9. The annealed specimen was treated with 2% villela’s reagent and the other specimens were treated with 2% nital reagent. The specimen prepared was as shown in figure 2 e). The microstructures for all the specimens under different heat treatment conditions were observed by using an axio image observer to find the changes in the microstructures formed as well as the surface morphology was characterized by FE-SEM and point EDS was done to find the distribution of elements and to get a clearer interpretation of changes in the microstructure. The microstructure of the specimen was characterized by X ray diffraction (XRD) using cobalt radiation (Co-K α ) as a source with a step size of 0.002° and phase angle considered

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