X-RAY MICROSCOPY 



Fig. 6. Photumicrugraph X2o0 





V.' 



Fig. 7. ^MieiuiaLliugiapli X230 



Alloy steel (20%Cr, 7%Xi, 3J>29c^io) showing sigma phase in austenite matrix after heating at 900°C. 

 for 500 hours. Fig. 7 indicates segregation of molybdenum between the two phases. 



' Or, •-, . 





. ..k * 













\ • X • J^ 



^ 



S- 





A. 













»- 





« 

 .♦ 



Fig. 8. Microradiograph X160 Fig. 9. Photomicrograph X160 



Alloy steel (15%Cr, 18%Ni, 3%Mn, 2}i%Mo, 7%Co, 2}i%lSih). Contains carbides and intermetellic 

 compounds. (Segregation of alloj^ elements was further elucidated by use of other radiations). Note: 

 Effect of specimen thickness. 



590 



