Erratum to: Iterative solutions for one-dimensional diffusion with time varying surface composition and composition-depe
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(a)
(c) 2(b) to (d). F i g u r e 2(d) i n d i c a t e s a d u c t i l e , d i m p l e r u p t u r e type f r a c t u r e s i m i l a r to Fig. 2(a). The f r a c t u r e b e h a v i o r d i s c u s s e d in this s e c t i o n a g r e e s well with the t r e n d shown i n T a b l e II and F i g . 1. In l a r g e - s c a l e c o m m e r c i a l heat t r e a t m e n t , the humidity c o n t r o l of the h i g h - t e m p e r a t u r e a n n e a l i n g a t m o s p h e r e may not always be e a s y . The l o w - t e m p e r a t u r e h y d r o g e n - r e l i e f t r e a t m e n t such as u s e d i n the p r e s e n t work could thus s e r v e as a safety p r e caution to cure u n d e s i r a b l e h y d r o g e n - e m b r i t t l e m e n t r e s u l t i n g f r o m i n a d v e r t e n t l y i n t r o d u c e d high h u m i d i t y in the a n n e a l i n g a t m o s p h e r e . In s u m m a r y , the high h u m i d i t y p r e s e n t in the high t e m p e r a t u r e a n n e a l i n g a t m o s p h e r e was found to c a u s e
Fig. 2 - F r a c t u r e s u r f a c e s o f b r o k e n tensile s p e c i m e n s tested
after (a) dry N2 anneal, (b) wet N2 anneal, (c) dry H2 anneal, and (d) wet N2 anneal + 250~ for 2 h treatment.
(d) a hydrogen e m b r i t t l e m e n t in the F e - C r - C o d u c t i l e m a g n e t alloy. A l o w - t e m p e r a t u r e , h y d r o g e n - r e l i e f a n n e a l was found to r e d u c e the h y d r o g e n c o n t e n t of the a l l o y and r e s t o r e the d u c t i l i t y of the e m b r i t t l e d
alloy. 1. 2. 3. 4. 5. 6. 7. 8.
I. M. Bernstein: Mater. ScL Eng., 1970, vol. 6, p. 1. I. T. Brown and W. M. Baldwin: Trans. TMS-AIME, 1954, vol. 200, p. 298. A. R. Troiano: Trans, ASM, 1959, vol. 52, p. 54. H. H. Johnson, J. G. Morlet, and A. R. Troiano: Trans. TMS-AIME, 1959, vol. 212, p. 526. W. M. Baldwin and D. J. -P. Adenis: Trans. ASM, 1961, vol. 54, p. 381. A. S. Tetelman: Fracture o f Solid, p. 671, Interscience, New York, 1963. S. Jin, G. Y. Chin, and B. C. Wonsiewicz: IEEE Trans. Mag., 1980, vol. MAG-16, p. 139. S. Jin, S. Mahajan, and D. Brassen: Met. Trans. A, 1980, vol. l l A , p. 69.
C o r r e c t i o n to Met. Trans, A, 1980, vol. l l A
Iterative Solutions f o r One-Dimensional Diffusion with Time Varying Surface Composition and Composition-Dependent Diffusion Coefficient by M. Chow and C. R. Houska P a g e 111, the 3rd equation should r e a d : n=~
=
P a g e 112, 1st c o l u m n , 3rd p a r a g r a p h . The following s e n t e n c e should be o m i t t e d : The c o n c e n t r a t i o n at an i n t e r i o r point at a t i m e t i s given by C(x, t) = Cs(t)CF(X, t).
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