The pearlite, on the other hand, does not respond to tempering, and does not change in hardness.
22.
The steel can then be tempered by reheating to a temperature in between, changing the proportions of pearlite and martensite.
23.
This microstructure is referred to as " sphereoidite . " If cooled a little faster, then coarse pearlite will form.
24.
The temperature range for transformation of austenite to bainite ( 250 550 �C ) is between those for pearlite and martensite.
25.
"' Expanded Pearlite "' Used to reduce the weight as water is added with its addition.
26.
It should be noted that some pearlite or ferrite may be present if the quench did not rapidly cool off all the steel.
27.
The " tamahagane ", in particular, contains pearlite, which produces a characteristic pearlescent-sheen on the crystals.
28.
The two, ferrite and cementite, precipitate simultaneously producing a layered structure called pearlite, named for its resemblance to mother of pearl.
29.
A euctoid steel ( 0.77 % carbon ) will have a pearlite structure throughout the grains with no cementite at the boundaries.
30.
A semi-tempered middle ring of martensite and bainite, and 3 . a mild circular core of bainite, ferrite and pearlite.
