Influence of pressure sintering on properties of cemented carbides

Influence of pressure sintering on properties of cemented carbides

PM (in . l a p a n e s e . ) S t u d i e s (,f tile a d h e s i o n h e t w e e n TiC-Ni a n d WC-Co a r e d e s c r i b e d . It is r e p o r t e d ...

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(in . l a p a n e s e . ) S t u d i e s (,f tile a d h e s i o n h e t w e e n TiC-Ni a n d WC-Co a r e d e s c r i b e d . It is r e p o r t e d t h a t Ni d i f f u s e s f r o m t h e TiC-Ni i n l o t h e We-Co during bonding resulting in s h r i n k a g ( , a n d s w e l l i n g o f t h e two alloys, respectively, w i t h a n i n c r e a s e in h a r d n e s s o f t h e TiC-Ni. T h e a m o u n t of m a s h t r a n s f e r a n d t h e t h i c k n e s s of t h e i n t e r f a c i a l z o n e depende(I on tim hondmg temperature and time, t h e C c ( ) n t e n t s o f l,he m a t e r i a l s a n d t h e c o o l i n g rate. T h e m e c h a n i s m of liquid Ni flow in d i s c u s s e d E F F E C T S OF C E R A M I C P A R T I C L E C O N T E N T ON T E N S I L E P R O P E R T I E S OF TOOL S T E E L MATRIX C O M P O S I T E

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A s t u d y of t h e c u t t i n g p e r f o r m a n c e of TiC t o o l s is d e s c n b e d . T I C - ( 0 to 4 0 ) vol% TIN-10% Mo~('-l()% Ni w a s u s e d in t h e i n v e s I i g a t i o n . It is n o t e d t h a t a s t h e TiN c o n t e n t is i n c r e a s e d d e f o r m a t i o n o f t h e c u t I i n g e d g e is r e d u c e d w i t h r e s u l t a n t r e d u c t i o n in t h e n m n b e r o f fine c r a c k s p e r p e n d i c u l a r to t h e c u t t i n g edge. T h e i n c r e a s e d r e s i s t a n c e to c h i p p i n g of t h e n i l r i d e c o n t a i n i n g m a t e r i a l s is a t t r i b u t e d to s u p e r i o r c r e e p s t e n g t h in r e l a t i o n to thermal properties. ADHESIVE STRENGTH BETWEEN TITANIUM CARBIDE AND TUNGSTEN CARBIDE CEMENTED CERMETS O. "l'erada et al (Fuji Die Co, Tokyo, J a p a n ) ,

A. Ravin(Ira et al ( U n i v e r s i t y o f A k r o n , ()hie, lISA), t'owd(,r Metallurgy S(qence and Technology, Vol 3, No 4, 1992, 38-52. T h e efteels of a d d i t i o n s o f TiC p a r t i c l e s on tile s t r u t ! uren anti p r o t ) e r t i e s (if a 5%Cr4'~;Mo-I).5%Ni-0.4!>,;(" t o o l s t e e l w e r e m v e s t i g a ! e d . T h e s t r ( , n g t h is r e p o r t e d to be i n c r e a s e d by a l l o u t 2()(:;; for t h e a d d i t i o n of 35 o r 40 w)l':{) TiC. t h e e h m g a t i o n b e i n g a b o u t l':,. F r a c t u r e is s h o w n to o c c u r by f r a c t u r e of t h e TiC or failure at t h e TIC. m a t r i x interface.

.Japanese). T h e s! r e n g t h of t h e b o n d b e t w e e n TiC-19 wt% Mo.,C-24% Ni a n d W C - ( l l ) o r 15) wt% Co w a s i n v e s I i g a t e d u s i n g t r a n s v e r s e r u p t u r e s t r e s s (TRS) tests. T h e f i n d i n g s w e r e t h a t t h e f r a c t u r e o c u r r e d in t h e i n t e r l a c e z o n e b e t w e e n t h e two e e r m e t s . T h e TRS w a s f o u n d to i n c r e a s e w i t h r e d u c e d honding temperature. The results are discussed.

E F F E C T OF A N N E A L I N G ON S T R U C T U R E A N D P R O P E R T I E S OF HOT C O M P A C T E D B O R O N C A R B I D E

I N F L U E N C E OF P R E S S U R E S I N T E R I N G ON P R O P E R T I E S OF C E M E N T E D CARBIDES

A.A. K o r n e e v et al, Pomshkovaya Metallurgiya, No l, 1992, 69-72 ( m R u s s i a n ) . T h e effeet of h e a t t r a l I n e n t , in t h e r a n g e 160t) t(i 2 2 5 0 : C . on ! h e s t r u c u t r e a n d l ) r o p e r t i e s o f hot. c o m p a c t e d b o r o n c a r b i d e w a s i n v e s t i g a t e d . T h e m i c r o h a r d n c s s is s h o w n to d e c l i n e f r o m 43 to 35 GPa a n d t h e f r a c t u r e t ( ) u g h n e s s !o h a v e a m a x i m u m a t 2 1 0 0 C. C h a n g e s in p r o p e r t i e s a r e ('orrelated with the structure. P E R F O R M A N C E OF S T E E L C U T T I N G TOOLS U S E D WITH M A C H I N A B L E CERAMICS E. S e n t o k u et al ( K a n a z a w a T e c h n i c a l (7ollege, K a n a z a w a , , J a p a n ) , J Japan Soc Pou,der and Powder Metallurgy, Vol 39, No 8, 1992, 6 4 6 - 6 4 9 ).in J a p a n e s e ) . An assessment in m a d ( , o f t h e l ) e r f o r m a n c e o f steel CUlting tools u s e d in finish m a c h i n i n g o f c e r a m i c s . It is s h o w n t h a t close d i m e n s i o n a l t o l e r a n c e s c a n be a t t a i n e d . A s t u d y o f tool f o r m anti finish is p r e s e n t e d . T h e s u r f a c e of t h e m a c h i n e d c e r a m i c is f(lund to be i m p r o v e d by l a p p i n g t h e s u r f a c e (If t h e tool a n d by u s e of tile o p t i m u m tool s h a p e . I N F L U E N C E OF A D D I T I O N OF N I T R O G E N ON C H I P P I N G R E S I S T A N C E OF T I T A N I U M C A R B I D E TOOLS M. l e k i et al ( T o s h i h a T u n g a l o y ('o, lad., K a w a s a k i . J a p a n ) , J Japan Soc Powder

and Powder Metalurgy, Vol 39, No 8, 1992, 650-655 (in Japanese).

J Japan Soc Po~:de.r and Pmvder Metallurgy, Vol 39, No 8, 1992, 6 5 6 - 6 5 9 (in

A. I ) o u b r a v s ~ , a n d R. IIruby (PRAMETVPM, S u m p e r k , C z e c h o s l o v a k i a ) , Pokroky Praskove Metalurgie, No 1-2, 1992, 5-10 (in Czech.) The paper describes the results of testing an installation for pressure s i n t e r i n g of c e m e n t e d c a r b i d e s . T h e w o r k w a s i n t r o d u c e d in a n e a r l i e r p u b l i c a t i o n Pokroky Praskove Metalurgie, No 3-4, 1992, 23-32. P H A S E D I A G R A M S AS A TOOL IN D E V E L O P M E N T A N D P R O D U C T I O N OF CEMENTED CARBIDES AND STEELS B. U h r e n i u s ( S a n d v i k ( ? o r o m a n t AB, Stockh o l m , S w e d e n ) , Powder Metallurgy, Vol 35, No 3, 1992, 203-210. The use of phase diagrams, notably c a l c u l a t e d o n e s , in t h e d e v e l o p m e n t o f cemented c a r b i d e s a n d I(iol s t e e l s is discussed w i t h r e f e r e n c e to a c c u r a t e c o n t r o l of t h e c a r b o n b a l a n c e n e e d e d to e n s u r e s u c e s s f i d s i n t e r i n g o f We-Co a n d FeNi b a s e d c a r b i d e s . In t h e c a s e o f steel d e v e l o p m e n t work, iI is r e p o r t e d to be f a c i l i t a I e d by t h e w i d e r a n g e of p h a s e e q u i l i b r i u m d a t a availahlc. E x a m p l e s a r e given w h e r e s u c h d a t a h a s b e e n s u c e s s f u l l y used. S T R U C T U R E A N D P R O P E R T I E S OF NICKEL-CHROMIUM DIBORIDE ALLOYS V.N. Y a n e n s k y et al, Poroshkovaya Metal-

l u ~ y a , No 1. 1992, 32-37 (in R u s s i a n ) . A s t u d y o f e q u i l i b r i a in Ni-Cr-B in d e s c r i b e d p a r l i c u l a r l y CrB~. Effects of heat treatment on structure, me('hanical properties and wear are illustrated. Wear r e s i s t a n c e is sho'~,ql t(i i n c r e a s e 1W i n c r e a s e in t h e a m o u n t of CrB._, in l h e alh)y. T H E R M O D Y N A M I C ANALYSIS OF S I N T E R I N G P R O C E S S E S FOR P R O D U C T I O N OF C E M E N T E D CARBIDES M.H. R a n d a n t i B. t : h r ( ' n i u s ( S a n d v i k C o r o m a n t AB, S t o c k h o l m S w e d e n ) . P o . ' ck~r Metallurgy, Vol 35. No 3, 1992, 211219. T h e t e h r m ( l d y n a m i c d a t a ti)r t h e ('-Co-()Ti, W-Y-Zr-Si-AI-S nTsterns art' a s s e m i ) l c d and the equilihrium reactions during s i n t e r i n g o f ('o:l'i-W-C on Y~():~ s t a b i l i z e d ZrO 2 (YSZ) s u b s t r a t e s in p r e s e n c e o f ( ' a aluminosilicates and CaS arc established. Results are llresented for various combinations of compoumls at 145 ('. S o m e i m p u r i t i e s a r e r e p o r t e d to f o r m liqui(l p h a s e s a n d d e p o s i t s m a y he fi)rmed which contaminate the cement(,d carbides w i t h S or Si. LIQUID PHASE S I N T E R I N G OF TOOL STEEL COMPOSITEDS CONTAINING TITANIUM CARBONITRIDE B.P. S a h a a n d G.S. l ! p a t l h y a y a ( I n d i a n Inst. o f T e c h n o l o g y , K a n p u r , I n d i a ) , Powder Metall In!, Vol 24, No 6, 1992, 345-:150. T h e effects o f Ul) to 6 wt",, Ti ((',N) on t h e p r o p e r t i e s o f T l 5 a n d T42 II sinlere(l h i g h speed steels were investigated. The structures and properties are discussed. C U T T I N G P R O P E R T I E S OF POLYCRYSTALLINE BORON N I T R I D E C O M P A C T S S I N T E R E D IN SIlOCK WAVES V.I. K o v t u n et al, t'oroshkovaya Metallur giya, No 1, 1992, 8 1 - 8 7 (in R u s s i a n ) . T h e c u t t i n g p r o p e r t i e s o f BN i ) r e p a r e d f r o m s p h e r i c a l p o w d e r by i s o n t a t i c i)resnure o r s h o c k c o n s o l i d a t i o n fi)llowed by flIP w e r e s t u d i e d . It is s h o w n t h a t l h e w e a r r a t e s a r e lower for t h e s h o c k c o n s o l i d a t e ( I m a t e r i a l .

Intermetallic materials F R A C T U R E T O U G H N E S 1N GAMMA TITANIUM ALUMINIDE K.S. C h a n . J of Metals. Vol 44, No 5, 1992, 30-38. It is s h o w n that the aml)ienl temperature du('tility and fracture t o u g h n e s s o f TiAI h a s b e e n i n c r e a s e d t)y alloy a(lditions anti colnrol of m i c r o n t r u c t u r e . Two p h a s e TiAI alloys a r e r e p o r t e d to h a v e p o t e n t i a l for a e r o s p a c e applications. Fracture l)ro('esses and s t r e n g t h e n i n g m e c h a n i s m s in TiAI ban(, alloys art, reviewed w i l h r('sI)eCt to t h e

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