Termicka Obrada- Program
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Transcript of Termicka Obrada- Program
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TERMIKA OBRADA METALA
Volumenske promjene pri
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Zadatak:
hlaenju na puni martenzit ugljeninog elika sa 0,9%C.
Izraunati:
volumenski udio ferita i cementita,
specifini volumen elika na temp. 0C,
s ecifini volumen elika na tem . 300C,
specifini volumen elika na temp. Ac1-1 ( 722C), specifini volumen elika na temp. Ac3+1, Accm+1,
specifini volumen elika na temp. 280C iznad Ac3, Accm specifini volumen elika na temp. 1C iznad Ms (aust.),
specifini volumen elika na temp. 1C ispod Mf (mart.),
volumenske promjene pri prelazu , volumenske promjene pri prelazu i
dijagramski predstaviti volumenske promjene.
martenzit
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Formule za izraunavanje specifinog
volumena ferita, austenita, martenzita icementita.
eritavolCto %105285127080 6 +=
CCtoaustenita %1015,21056,812282,0 36 ++=
cementitavolCt
t
o
CFe
martenzita
%)1088,413023,0(
,,,
6
3 +=
++=
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.
grCCgrFe
CFe
3
3
12180
1804,179124,167128,553
=+=+=
grCCXgrFe3
9,0180
9,0
==
=
e3,
12
Atomska masa Fe=55,8 g/mol, C=12 g/mol
- , = , = ferita
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===
g
cm
m
V
m
11
.
.
teinaspec
volumenspec
375810,113023,05,133
cmV
mV
CFe ===
3
3
75052,1299242,1075810,1
99242,1012708,05,86
3 cmVVV
cmV
feritaCFeelika
ferita
=+=+=
==
Ukupni volumenelika je 12,75052 cm3
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cmcm CFeel3
.3 75810,175052,12
Xcmcm CFeel3
.3
100758101
100 3
e3
,75052,12
==
o umens u o cemen a u e u e , , g
a ferita 86,22% tj.0,8622 g
100-13,78=86,22%
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2. Specifini volumen elika na 0C
CFeferitael
06
.3
+=
cm
er avoferita3
6 109568,08622,0010528,512708,0
,,
=+=
=
cmC
g3
06 01794,01378,0)01088,413023,0( =+=
cm
g
3
127513,0017945,0109568,0 =+= g
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.
+=
cm
feritavolCferita3
06
.
%)30010528,512708,0( +=
cm
gferita
306
,,,,
==
=+=
cm
g
elika
CFe
3
129137,00181474,011099,0
,,,,3
=+= g
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4. Specifini volumen elika na A -1C (722C)
CFeferita
el. 3+=
cm
eritavoferita3
6 113009,08622,0)72210528,512708,0(
,,
=+=
+=
cmC
g
CFe
306 018431,01378,0)7221088,413023,0(
3=+=
cmelika
3
13144,0018431,0113009,0 =+=
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5. Specifini volumen elika na A +1C (776C)
=
cmaustenita
austenitae i a
336 131397,09,01015,27761056,812282,0 =++=
g
cmelika
3
131397,0=
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. . C3, ccm
cmaustenita
austenitaelika
336 13378,09,01015,210551056,812282,0 =++=
=
cm
g
elika
3
13378,0=
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= . .
austenitaelika=
g
cmaustenita
336 126903,09,01015,22511056,812282,0 =++=
gcmelika 126903,0=
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=- . .
cmmartenzita
martenzitaelika
336 129275,09,01079,2)71(1045,412708,0 =++=
=
cmelika
3
12927,0=
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.
%03,010013144,0
,,100
)1( 1
31 ==
C
CC
Aelika
martenzit10. Volumenske promjene pri prelazu
%83,1100
12927,0
126903,012927,0100
)1()1(=
=
+ Sf MelikaMelika
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11. Dijagram volumenske promjene
