532 C. H. Mathewson — Metallographic Description 



OS 



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PQ 



M-l 

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o> p 



Indeter. in 



original 



state. After 



30m. anneal 



at 700°, in 



shank— 23 





Several 

 inches from 

 point — 33 





P 

 <c 



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03 

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Cast to approx. final form. 

 Worked locally with light 

 intermediate anneal. Fin- 

 ished stiff in shank and 

 blade 



Cold-worked at extremities 

 with very light interme- 

 diate local anneal 



Shank extended by cold- 

 working. Annealed with 

 decreasing intensity from 

 point towards head (thrust 

 part way into fire). Fin- 

 ished stiff and hard 





CO 

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CQ 



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0) 



o 

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OS 



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Predominant casting struc- 

 ture with local deforma- 

 tional characteristics 



Cast structure throughout 

 figure of bird, severely de- 

 formed in attenuated bill. 

 Distinguishable cast str. in 

 spatula end but consider- 

 ably altered by deforma- 

 tion and incipient recrys- 

 tallization 



Succession of changing 

 structures passing from the 

 normal cast head to the 

 completely recrystallized 

 point 



Typical cast structure with 

 congenital (?) twins in a 

 region of special configura- 

 tion 



Photo- 

 Micrograph 



Fig. (36), 37, 

 38, 39 



Fig. (40), 41, 



41,42,43, 



44, 45 



bo 



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p ou 

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Longitudinal 



section from 



end to end 



Longitudinal 



section from 



end to end 



Isolated sec- 

 tions along 

 principal axis 



Section 



through 



center 



B 

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CO 



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T-H 

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 £ 



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