Steels_ Metallurgy and Applications, Third Edition

18 Steels: Metallurgy and Applications

i

O

, (a) ,,, ,

~((X)I) (112)

[,[110] [1t0]

,, I

10

100s

lO00s

(111)

[1to] z

1000s

(11o_)

[1t01,

1000s

0 ~ 30 ~ 60*

(b)

-(111) -(111)

[o11] [tt2]

,ooof

glP t _

90* 60 ~ 90 ~

r

Figure 1.14 Development of orientation density during the recrystallization of a
vacuum-degassed steel annealed at 700"C (a) a fibre and (b) y fibre (skeleton line) (Emren
et ell. 35)

10

E 9

7

1.7

1.6

1.5

1.4

0 Slow

heating

9 Rapid

heating

e--""

~ ~

Grain size number of hot band (ASTM)

Figure 1.15 Effect of hot band grain size on the recrystallized grain size and rm value of
aluminium-killed steel heated to 700"C at 100" C/h and held for I hour and at 50* C/s and
heM for 1.5 min (Ono and Nishimoto 36)