Which neutral elements do not form carbides?
Mechanical Engineering (MCQ) questions and answers
Q. Which of the following neutral elements neither form carbides nor cause graphitization?
- Published on 11 Sep 15
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Tauseef Ahmed Shaikh Mukhtar
-Posted on 18 Apr 17
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-Posted on 21 Nov 15
- Alloys steels are obtained when elements such as nickel, chromium, manganese, vanadium, etc. are added to carbon steels.
- These elements impart fine grain size to steel, to improve casehardening properties and elasticity, etc.
- These alloying elements are classified as:
1) Carbide forming elements:
Alloy carbides are hard and increases abrasion resistance. Carbides such as chromium and vanadium have maximum hardness during tempering of high alloy tool steels.
2) Neutral elements:
The element which neither forms carbides nor causes graphitization is Cobalt. Cobalt refines graphite and pearlite and also improves heat resistance. It contributes to red-hardness by hardening ferrite and improves mechanical properties like tensile strength, fatigue strength and hardness.
3) Graphitizing elements:
These elements are used to decompose carbides into graphite.
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