PSI - Issue 14

Sourabh Shukla et al. / Procedia Structural Integrity 14 (2019) 259–264 Sourabh shukla et al./ Structural Integrity Procedia 00 (2018) 000–000

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martensite. It is observe that at 45% CW for 900°C-2 hrs, hardness decreases to 302.8 Hv, i.e. close to SA sample. As those carbides which are formed and increases the hardness, those formation of carbides decreases due to martensitic reversal.

Table 2. Volume fraction of Martensite (%) of SA and CW samples after TA of ASS Sample 0% CW 25% CW

45% CW

SA

0 0 0

24.30

42.07 18.75

700°C-2 hrs 900°C-2 hrs

9.32 4.20

2.18

Table 3. Hardness Value (HV) of SA and CW samples after TA of ASS Sample 0% CW

25% CW

45%

SA

242.5 239.3 233.5

345.3 415.9 328.2

518.3 365.2 302.8

700°C-2 hrs 900°C-2 hrs

4.2 Microstructure

SA

(b)

(c)

(a)

25

(d)

(e)

(f)

45

(g)

(h)

(i)

Fig 2. Microstructure of CW samples at different TA temperature: (a) SA, (b) SA+700°C, (c) SA+900°C, (d) 25%CW+SA, (e) 25%CW+700°C, (f) 25%CW+900°C, (g) 45%CW+SA, (h) 45%CW+700°C, and (i) 45%CW+900°C