What happens when austenitic steel is heated?

Q.  Which element precipitates at the grain boundaries, when austenitic stainless steel is heated at 900 oC?
- Published on 11 Sep 15

a. Aluminium carbide
b. Chromium carbide
c. Magnesium carbide
d. Molybdenum carbide

ANSWER: Chromium carbide

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    Discussion

  • Sravanthi    -Posted on 16 Nov 15
    Chromium carbide precipitates at the grain boundaries, when austenitic stainless steel is heated at 400°C-900°C.

    - This is called as sensitization which occurs only when austenitic stainless steel or stainless steel of type 300 is heated.

    - At this temperature carbon reacts with chromium to form chromium carbide when carbon diffuses to grain boundaries. This process depends upon temperature and its range and also upon time.

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