iron carbon Flashcards
(30 cards)
ferrite starts at what state
BCC
gamma iron is at what temp
912 c (FCC)
delta iron at what state( delta ferrite)
BCC
what temp delta ferrite melts
1538 c
most fe-c alloys have less what concentration
7%
pure iron wt concentration
0.008
steel wt concentration
0.008-2.14
cast iron wt concentration
2.14-6.67
what’s the state after 6.67 wt-C
cementite
whats the exact composition of Fe-C like
cementite
what’s the bad effect of graphite in iron
increases wear resistance and decreases tensile strength
alpha ferrite structure
BCC
carbon dissolves less because of
bcc structure and few interstitials where c fits.
how much max carbon ca be dissolved in alpha ferrite structure
0.022
whats the gamma iron called
austenite
whats the austenite structure
FCC
how much carbon can be dissolved in austenite
2.14 wt%c
what state transfers from liquid to solid
eutectic: A eutectic transformation involves the simultaneous solidification of two or more phases from a liquid phase
what state transfers from solid to solid
eutectoid: A eutectoid transformation occurs in a solid-state phase change within a single-phase region
whts the structure called with high melting part inside and low melting part outside
cored structure
whats sgregation
non uniform distribution of grains upon cooloing
what does eutectic mean
easily melted
whats the structure called when liquid is cooled thru eutectic point
lamlaar
how can we get more more fraction of eutectic microconstituents
by not maintaining equillibrium conditions
