Explain how you would produce a hard surface in the followings, Give reason(s) for your selection. 1-A shaft made from 1%

Question

Explain how you would produce a hard surface in the followings, Give reason(s) for your
selection.
1-A shaft made from 1% Al-1.5%Cr steel which has to operate at a temperature between 350 and
400°C.
2-A gear wheel made from a 0.5%C steel which requires a hard surface to improve its wear-resistant
properties.
3-An automobile axle requires an accurate thickness of the hardened case.
4-Large quantities of low carbon steel parts.
5-Very high wear resistance surface.

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