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fdeg
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Fe-Fe3C .
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Feδ ,
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.
– –
Feγ. – . – 2,14%
1147° C ( ).
tmin = 727° C. :
. tmin = 727° C
(0,8%) – S.
727° C .
– – .
– 0,8% .
t < 727° C. :
.
– –
Feα; ; – 0,006% t=20° C.
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– – Fe3C – (
). = 6,67%. – .
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– – .
1147° C ( ECD).
– – .
<727° C .
.
ACB – .
AECD – .
ECD – ; – ( ).
SE – ; II.
GS – ;
, . PSK – ; .
PM – ; – III
GP – ;
.
: 0–2,14% – (0–0,8% –
17
, 0,8–2,14% – ); 2,14–6,67% – (2,14–4,3% –
, 4,3–6,67% – ).
Fe .
2,14%. 1) :
4–4': k = 2; f = 3 ( + + ); = 2–3+1=0 (t =
const).
1–2 –
2–3 – ( )
3–4 – ,
, . 4–4' – , .
4' – ,
( III).
1) :
1–2 – ,
2–3 – ( )
3–4 – ; 3 –
Feγ.
,
, .
4–4' – ; 4' –
; t = 727° C =const .
4' – ,
, III ( ). 1) :
1–2 – .
2–2' – (t = 1147° C); 2' – , .
2'–4 – . 4–4' – .
4' – .
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1) . – .
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1), ,
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. 1) .
t1>727° C. :
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:
I. .
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II. .
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III. .
I .
2) .
t1>727° C.
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–
t>727° C.
–
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–
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– .
500–550° C ,
,
. <550° C
.
:
I. .
, . II. .
III. .
, . 3) . .
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