Elimination and Control of δ Ferrite in M50NiL Bearing Steel

Figure 7

Optical micrographs of M50NiL steel annealed at 1200°C for different holding times: (a) 0.5 h, (b) 5 h, (c) 10 h, (d) 30 h, and (e) 50 h.

(a)

(b)

(c)

(d)

(e)