Dislocation etch pitting in high-purity niobium
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l o c a t i o n s with the use of X - r a y t o p o g r a p h i c t e c h n i q u e s 1 w e r e not s u c c e s s f u l due to the l i m i t e d r e s o l u t i o n of the X - r a y m e t h o d s t r i e d ( b a s e d on the B e r g - B a r r e t t technique). The a u t h o r s would l i k e to a c k n o w l e d g e the s u p p o r t of the Office of N a v a l R e s e a r c h , C o n t r a c t N00014-67A-0305-0020. 1. R. P. Walson: Ph.D. Thesis, Department of Metallurgy and Mining Engineering, University of Illinois, 1973. 2. A. B. Michael and F. J. Huegel: ActaMet., 1957, vol. l, p. 339. 3. R. Bakish: Trans. TMS-AIME, 1958, vol. 212, p. 818. 4. P. R. V. Evans: J. Less-CommonMet., 1964, vol. 6, p. 253. 5. E. Zedler: 3:. AppZ Phys., 1967, vol. 38, p. 2046. 6. R. G. Vardiman andM. R. Achter: Trans. TMS-AIME, 1968, vol. 242, p. 196. 7. H. D. Bugerman: ActaMet., 1968, vol. 16, p. 713. 8. J. Pellig: J. Less-CommonMet., 1969, vol. 17, p. 130. 9. R. Arndt: Z. fiirMetalkunde, 1969, vol. 60, p. 29.
a wide r a n g e of t h e r m a l and m e c h a n i c a l p r e t r e a t m e n t s . 1 Although the p h a s e s t a b i l i t y and the r e c o v e r y and r e crystallization behavior were thoroughly characterized b y o p t i c a l and e l e c t r o n m i c r o s c o p y a s well a s X - r a y d i f f r a c t i o n t e c h n i q u e s , the o n l y m e c h a n i c a l p r o p e r t y r e p o r t e d was d i a m o n d p y r a m i d h a r d n e s s . The p r e s e n t c o m m u n i c a t i o n r e p o r t s the t e n s i l e p r o p e r t i e s for s a m p l e s given a s i m i l a r b r o a d r a n g e of p r e t r e a t m e n t s at both a m b i e n t and e l e v a t e d t e m p e r a t u r e s and c o r r e l a t e s t h e s e r e s u l t s with the m i c r o s t r u c t u r a l d a t a of p a r t I. P r e v i o u s i n v e s t i g a t i o n s of t e n s i l e p r o p e r t y d a t a f o r type 316 s t a i n l e s s s t e e l have not c o v e r e d the b r o a d r a n g e of p r e t r e a t m e n t s r e p o r t e d h e r e and often have not b e e n c a r e f u l l y c o r r e l a t e d with m i c r o s t r u c t u r e . A m o n g the m a n y p a p e r s d e a l i n g with s o m e a s p e c t of the t e n s i l e b e h a v i o r of type 316 s t a i n l e s s s t e e l , it is n o t e w o r t h y t h a t d a t a can b e found f o r the t e n s i l e p r o p e r t i e s of s o l u t i o n t r e a t e d and l i g h t l y cold w o r k e d m a t e r i a l s a s a function of t e s t t e m p e r a t u r e f '3 The s t r a i n aging b e h a v i o r 4,s and the effect of n e u t r o n i r r a d i a t i o n have a l s o r e c e i v e d s p e c i a l a t t e n t i o n , s'6 Scott and S p r u i e l l ~ have r e c e n t l y p r e s e n t e d the g r a i n s i z e d e p e n d e n c e of the t e n s i l e p r o p e r t i e s of t y p e 316 s t e e l . A r a p i d h e a t i n g t e c h n i q u e was u s e d to o b t a i n a v e r a g e g r a i n d i a m e t e r s r a n g i n g f r o m 3 to 70 ~ m . The n a t u r e of t h i s t e c h n i q
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