Issue 49

D. Kumar et alii, Frattura ed Integrità Strutturale, 49 (2019) 507-514; DOI: 10.3221/IGF-ESIS.49.47 511 addition, M 7 C 3 type carbides are reported to restrict continuous needle like carbides precipitation to discontinuous and chunk like carbides. Higher hardness and higher affinity to carbon of VC as compared to M 7 C 3 type carbides and the martensitic transformation might have imparted more hardness to the matrix of base material with 0.5 wt. % V content. Higher vanadium content is found to stabilize austenite further and thereby reduces hardness value [7]. Therefore, Fig. 4 shows first increase and then decrease in hardness. Figure 3: FESEM image and EDS spectrum of A) FB Cr26MoNi material precipitate, B) FB Cr26MoNi+0.5V material precipitate and C) FB Cr26MoNi+0.5V material matrix