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Thursday, 2 November 2017

MATERIAL SCIENCE || IMPORTANT QUESTIONS & DISCUSSIONS || GATE & SSC JE

One Liner Questions
In alloy, melting point can only be known by- Phase Diagram
Line which separates liquid and mushy one- Liquidus
Line which separates solid and mushy zone- Solidus
Finer grain size- Higher Strength and Lower Corrosion Resistance.
In Cu-Ni alloy, Ni acts as a Phase Stabilizer.

In Iron Cr, W, Si, Mo is a Ferrite Stabilizer and Ni, Mn, C, N2 is an Austenite Stabilizer.
Curie Point for Iron- 768˚C
Crystal Structure of Cementite- Orthorhombic
Crystal Structure of Martensite- BCT
Hot Shortness or Sulphur Brittleness- Mn is added
Hadfield Steel Mn is added to increase hardness. App.- Buldozers
Killed Steel Addition of silicon to remove oxygen.
Silicon is a Graphitizing Agent in cast iron.
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