Diagram Legend

A - Austenite
B - Bainite
C - Carbide
F - Ferrite
P - Pearlite
M - Martensite
RA - Retained austenite

CCT - Continuous-cooling transformation diagram
DCCT - Deformation continuous cooling transformation diagram
TTT - Time-temperature transformation diagram
TTA - Time-temperature austenitisation diagram
TTE - Time-temperature precipitation diagram
TTP - Time-temperature precipitation diagram
TTS - Time-temperature sensitization diagram

As - Austenite start temperature
Af - Austenite finish temperature
Ac1 - Temperature at which austenite begins to form on heating
Ac1b - Temperature at which austenite begins to form on heating
Ace - Temperature at which transformation of ferrite into austenite is completed upon heating
Ac3 - Temperature at which transformation of ferrite into austenite is completed upon heating
Ms - Martensite start temperature
Mf - Martensite finish temperature
M50 - Temperature of 50% of austenite transformation to martensite
M90 - Temperature of 90% of austenite transformation to martensite

HRB - Brinell hardness
HRC - Rockwell hardness
HV - Vickers hardness
HV1 - Vickers hardenss, 1 kg load
HV0.1 - Vickers hardness, 0.1 kg load

Welding diagrams:

A - Austenite
AF - Acicular ferrite
CAF - Coarse acicular ferrite
Cz - Cz' - Starting time of bainite transformation from A3 or Ac3 to 773 K
Cf - Cf' - Starting time of ferrite transformation from A3 or Ac3 to 773 K
Cp - Cp' - Starting time of pearlite transformation from A3 or Ac3 to 773 K
Ce - Ce' - Starting time of all transformations
F - Ferrite
FS(NA) - Ferrite with non-aligned second phase
FSP - Ferrite sideplates
F + Zw - Ferrite + Bainite
LF - Lath ferrite
M - Martensite
PF - Polygonal ferrite
P - Pearlite
Zw - Bainite

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