Engineering Materials Science Structure and Properties of Engineering Materials Phase Diagrams

Which of the following statements are true regarding Isothermal transformation diagram.

1
When Eutectoid steel cooled from austenite phase to 600°C and held isothermally, pearlite will be formed.
2
When Eutectoid steel cooled from austenite phase to 400°C and held isothermally, bainite will be formed.
3
Hardness increases from martensite to pearlite.
4
M90 represents the temperature at which 90 % of martensite transformation is left.

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