The effects of austenitizing conditions on the M s temperature in Fe 3 Pt alloys
- PDF / 327,809 Bytes
- 3 Pages / 612 x 792 pts (letter) Page_size
- 90 Downloads / 203 Views
o
)-
uJ
E U T E C T I C COMPOSITION
Mn SOLID S O L U B I L I T Y
(2.69 + 0.08 a/o Mn) (0.72 -+ 0.03 w / o Mn)
(0.42 + 0.08 a/o Mn) (0.11 • 0.03 w / o Mn)
o
r
I
95
96
I 97
I
I 98
I
I 99
I
1 O0
a/o, Bi
Fig. 1-Equilibrium phase diagram in the eutectic region of the Bi-Mn system. Compositions determined using chemical spectrophotometric absorbance ([3) and energy dispersive X-ray spectrometry (O). and NAS 8-32219. We would a l s o like to thank F . H u r ley for his a s s i s t a n c e in making the c h e m i c a l s p e c trophotometric absorbance measurements. 1. M. R. Notis, D. Shah, C. D. Graham, Jr., and S. R. Trout: J. Appl. Phys., 1978, vol. 49, p. 2043. 2. Ron G. Piricb and D. J. Larson, Jr., J. AppL Phys., I979, vol. 50, p. 2425. 3. J. N. Noothoven van Goor and H. Zijlstra: J. AppL Phys., t968, vol. 39, p. 5471. 4. D. J. Larson, Jr. and Ron G. Pirich: Unpublished research, Research Dept., Grumman Aerospace Corp., Bethpage, NY, 1978. 5. D. Siebe : Z. Anorg. Chem., 1919, vol. 108, p. 161. 6. E. Wachtel and R. Datum: Z. Metallk., 1963, vol. 54, p. 693. 7. M. Flemings: Solidifieaton Processing, p. t 09, McGraw-Hill, NY, 1974. 8. Ron G. Pirich, D. J. Larson, Jr., and G. Busch: Unpublished research, Research Dept., Grumman Aerospace Corp., Bethpage, NY, 1979. 9. T. Chen: J. Cryst. Growth, 1974, vols. 24 and 25, p. 454. 10. J. W. Colby: Unpublished research, Bell Telephone Laboratories, Allentown, PA, 1972.
The Effects of Austenitizing Conditions on the Ms Temperature in Fe3Pt Alloys H. CHANG AND S. SASTRI The effects of a u s t e n i t i z i n g c o n d i t i o n s on the M s t e m p e r a t u r e in F e - N i and F e - N i - C a l l o y s have b e e n the s u b j e c t of s e v e r a l i n v e s t i g a t i o n s . ~-5 It has b e e n shown that f a c t o r s s u c h as g r a i n size 3 and the defect d e n s i t y i n the a u s t e n i t e ~ which a r e t h e m s e l v e s dependent on the a u s t e n i t i z i n g t r e a t m e n t do affect the c o u r s e of its s u b s e q u e n t t r a n s f o r m a t i o n to m a r t e n s i t e . In F e - P t b i n a r y a l l o y s n e a r the c o m p o s i t i o n Fe3Pt the a u s t e n i t e u n d e r g o e s an fcc to L12 o r d e r i n g r e a c tion 6 in addition to the m a r t e n s i t e t r a n s f o r m a t i o n at a H. CHANG and S. SASTRI are Chief Scientist and Director, respectively, Chemical and Materials Research, Boston Research and Development Laboratories, Gillette Company, Boston, MA 02106. Manuscript submitted August 20, 1979. 194-VOLUME
l l A , J A N U A R Y 1980
lower temperature. It has been well established t l m t the M s t e m p e r a t u r e d e c r e a s e s as a f u n c t i o n of i n c r e a s tag a u s t e n i t e o r d e r in Fe3Pt alloys.7-11 The object of this study was to e l u c i d a t e the r e l a t i v e i n f l u e n c e of each of the c r i t i c a l a u s t e n i t i z i n g p a r a m e t e r s on the c o u r s e of the m a r t e n s i t e t r a n s f o r m a t i o n in t h e s e a l l o y s . The p a r a m e t
Data Loading...
