Steels_ Metallurgy and Applications, Third Edition

Low-carbon strip steels 79

900

O. r

600

c

,=- 300

m

9 r " I " 9 / " "1 ' I - -1

1 mln

0.1 C-1.2 Si-1.5 Mn

Transformed at 400~

.... I I , 9 I 9 I

0.1 0.2 0.3 0.4

Engineering strain

Figure 1.88 Room temperature engineering stress-strain curves of specimens of a
0.I C-1.2 Si-l.5 Mn steel transformed at 400~ for different times. Curves plotted to
failure (After Sakuma et al. 137)

900

800

9 ~, 700

~ 600

>" 500

400

300

t .... , - ,- ;--J .... = -i

[JT~0"4C 12S, 15Mn

"0.1 C-1.2 S1-1.6 Mn

40

35

~30

c 0

==,

0.14 C-1.2 SI-1.5~ i~^25

.~, 0.1 C-1.2 SI

YS 20

1.5 Mn

I 15

1 2 10 20

0.1 C-1.2 S1-1.5 Mn

0.1 C-1.2 S1-1.5 Mn-O,14 Mo

14 C ,=o1~ 1.5Mn

0.1 C-1.2 S1-1.5~n

/ / o~ c-12 sl

~.6 Mn

1 2 10 20

Transformation time at 400 ~

Figure 1.89 Changes in room temperature mechanical properties as a function of trans-

formation time for isothermally transformed specimen of the three steels (After Sakuma et

a1.~37)