Metallurgical Principles and Practice of Engineering (PE) Study Guide: Question #14

It Is the Policy of The Minerals, Metals & Materials Society (TMS) to Encourage the Professional Registration of Metallurgical Engineers.
Stainless steel is "sensitized" when a precipitate is formed at grain boundaries, changing some of the properties of the material. Stainless steels will become sensitized in varying amounts; some not at all. Type 304 is an example of a stainless steel that will become sensitized.

The phase that forms at grain boundaries in a sensitized austenitic stainless steel is:

(A)	chromium carbide, Cr₂₃C₆.
(B)	Iron carbide (cementite), Fe₃C.
(C)	sigma phase, Fe(Cr,Mo)
(D)	chromium oxide, Cr₂O₃.

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