5-1

5-2 5 2

5-3 5 3

5-4 0.77%C

5-5 --

5-6

5-7 Fe-C)5-7 Fe-C)

5-8 Fe-C5-8 Fe-C

5-9

5-10

5-11 -5 11

5 12 5-12

5 13 5-13

(a)() (b)()

5-14 T.T.T.MsMf

5-15

5-16 C C T C.C.T.

5-17

5-18 5-18

5-19 Fe-C

5-20 5 20

5-21 5-21

5-22 5-22

5-23 5-23

5-24 5 24

5-25 5-25

5-26 5-26

5-27 5-27

5-28 (380) (460) (380) (460)

5-29 5-29

5-30 0.45%C5 30 0.45%C

5-31 5-31

5-32 5-32

5-33

5-34 5-34

5-35 5-35

5-36 5-36

5-37 5-37

5-38 5-38

5-39 5-39

5-40 5 40

5-41 5-41

5-42 5-42

5-43 5-43

5-44 5-44

5-45 5-45

5-46 5-46

5-47 5-47

5-48 5-48

5-49 5-49

5-50 5 50

5 50() 5-50()

5-51 5 51