Microstructures
by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
Copyright©2005 by George Langford
Unknowns - Set 1 - Eighth specimen - M.I.T.'s #500
Type 304 stainless steel at 1000X etched (greyscale)
 This is a weld in a Type 304 stainless steel (18% chromium, 8% nickel, and 0.15 to 0.2% carbon).

I made both photomicrographs at 1000X (now in greyscale) and the dark spot in each image is an artifact caused by a dirty objective lens.

Which image shows the weld pool area ...
Type 304 stainless steel at 1000X (greyscale)
 ... and which one shows the heat-affected zone ?

What resistance to corrosion would this specimen have, and what could be done to avoid or to alleviate this bad situation ?



The link to the Answer for this specimen is at the bottom of this page as usual.

Go on to your analysis of Specimen 9.



























Answer: Follow this link.