外文资料翻译
学生姓名：专业班级：指导教师：
康英杰07机制四班张平格
河北工程大学科信学院
Pri
cipleofHeatTreatme
tofSteal
Theroleofheattreatme
ti
moder
mecha
icale
gi
eeri
gca
otbeoverestimatedThe
0
fcha
gesi
thepropertiesofmetalsduetoheattreatme
tareofextremelygreatsig
ifica
ce
1、Temperaturea
dTime
Thepurposeofa
yheattreati
gprocessistoproducethedesiredcha
gesi
thestructureofmetalbyheati
gtoaspecifiedtemperaturea
dbysubseque
tcooli
gThereforethemai
factorsacti
gi
heattreatme
taretemperaturea
dtimesothata
yprocessofheattreatme
tca
bereprese
tedi
temperaturetimetcoordi
atesHeattreatme
tco
ditio
sarecharacterizedbythefollowi
gparametersheati
gtemperaturetmaxiethemaximumtemperaturetowhicha
alloymetalisheated；timeofholdi
gattheheati
gtemperaturehheati
grate
ha
dcooli
gratec
Ifheati
gorcooli
gismadeataco
sta
tratethetemperaturetimerelatio
shipwillbedescribedbyastraightli
ewitharespectivea
gleofi
cli
eWithavaryi
gheati
gorcooli
gratetheactualrateshouldbeattributedtothegive
temperaturemorestrictlytoa
i
fi
itecha
geoftemperaturea
dtimethatisthefirstderivativeoftemperaturei
timeactdtdHeattreatme
tmaybeacomplexprocessi
cludi
gmultipleheati
gstagesi
terruptedorstepwiseheati
gcooli
gcooli
gtosubzerotemperatureetcA
yprocessofheattreatme
tca
bedescribedbyadiagrami
temperaturetimecoordi
ates
2、Formatio
ofAuste
ite
Thetra
sformatio
ofpearlitei
toauste
iteca
o
lytakeplaceattheequilibriumcriticalpoi
to
averyslowheati
gasfollowsfromtheFeCco
stitutio
aldiagramU
dercommo
co
ditio
sthetra
sformatio
isretardeda
dresultsi
overheati
gieoccursattemperaturesslightlyhighertha
thosei
dicatedi
theFeCdiagramWhe
overheatedabovethecriticalpoi
tpearlitetra
sformsi
toauste
itetherateoftra
sformatio
bei
gdepe
de
to
thedegreeofoverheati
gThetimeoftra
sformatio
atvarioustemperaturesdepe
di
go
thedegreeofoverheati
gshowsthatthetra
sformatio
takesplacefasteri
ashortertimeatahighertemperaturea
doccursatahighertemperatureo
aquickerheati
gFori
sta
ceo
quickheati
ga
dholdi
gat780℃thepearlitetoauste
itetra
sformatio
iscompletedi
2mi
utesa
do
holdi
gat740℃i
8mi
utes
1
fThee
dofthetra
sformatio
ischaracterizedbytheformatio
ofauste
itea
dthedisappeara
ceofpearliteferriteceme
titeThisauste
iteishoweveri
homoge
eouseve
i
thevolumeofasi
glegrai
I
placesearlieroccupiedbylamellaeorgrai
sofapearliteceme
titetheco
te
tofcarbo
isgreatertha
i
placesofferriticlamellaeThisiswhytheauste
itejustformedisi
homoge
eousI
orr