What is a Eutectoid Composition in Welding?

A eutectoid composition is a mixture of phases whose composition is determined by the eutectoid point in the solid region of an equilibrium diagram and whose constituents are formed by a eutectoid reaction. In welding, a eutectoid composition can be used to produce a variety of colors in the weld joint.

  • By controlling the amount of time the weld is cooled, the colors can be changed from light to dark. The eutectoid composition is also used to produce a variety of textures in the weld joint.
  • By controlling the amount of time the weld is cooled, the textures can be changed from smooth to rough.

What is eutectoid?

Eutectoid is a term used to describe the composition of the material at the eutectoid point. The eutectoid point is the temperature at which a solid solution of two different materials transforms into a mixture of two separate phases.

What is the eutectoid composition of plain carbon steel?

The eutectoid composition of plain carbon steel is 0.77% carbon.

What is a eutectoid alloy?

A eutectoid alloy is an alloy that contains the eutectoid composition of a particular element.

What is a eutectoid system?

A eutectoid system is a binary alloy system in which the eutectoid composition of one of the elements is zero.

Eutectoid transformation

The eutectoid transformation is the transformation of a material from one phase to another at the eutectoid point.

Related Links

Pearlite
Eutectoid Composition – an overview | ScienceDirect Topics
Eutectoid Transformation in Steels
What is eutectoid composition? | Physics Forums
Iron-Carbon Phase Diagram

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