Metallurgical Principles and Practice of Engineering (PE) Study Guide: Question #33

It Is the Policy of The Minerals, Metals & Materials Society (TMS) to Encourage the Professional Registration of Metallurgical Engineers.
Why would carburizing be chosen over through-hardening to improve fatigue resistance in a part?

(A)	The soft core will prevent the case from cracking under stress.
(B)	A crack which begins in the hard case will be stopped when it reaches the core.
(C)	Residual compressive stress in the case improves fatigue life.
(D)	The carburizing alloy is cheaper than a through-hardening alloy, since the carbon provides the hardenability.

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