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Superalloys
~~~~~~~~~~~!!!!!!!Literature Austin, TX, USA). Paper presented at TMS/AIMF Fall Meeting, Indianapolis, October 2-5. 1989.
AlzOJ·COATED CEMEf'oI"TED CARBIDE INSERTS
J Hofmann. et al, Pokroky Proskove Metalutgie, No This paper presents the results of work on high speed sliding contact materials focusing on the extension of the operating regimeof the \Vgraphite materials for low-voltage, high-speed applications. and on CU·\V speed applications. PRESENT AND FUTURE DEVELOPMENT OF SOFT MAGENTIC PM MATERIALS AND APPLICATIONS A Kordecki, B Weglinski (Techn. Univ. Wroclaw). Paper presented at the 1989 Powder Metallurgy 9-11 October, 1989. Group Meeting. Bnwness-on-Windermere, A description of soft magnetic powder composites, such as sinters, dielectrornagnetics and magnetodielectrics. and problems associated with their applications as magnetic cores of electrical converters, are presented in this paper.
2. 1989. 41-56.
The experimental results presentedsuggestthat the cutting life of AI20 rco ated inserts increases with the total coating thickness. On the base of practical examples the application of AIzOrcoated inserts during the steel turning at the high cutting speeds and during the cast iron turning and milling is demonstrated.
Refractory Metals EFFECT OF COLD FORGING ONTHE PROPERTIES OF Cu·W MECHANICALLY ALLOYED COMPOSITE MATERIALS
J Kaczmar, A Niechajowicz [lnst. MachineBuilding Techn. Wroclaw, Poland). Paper presented at the 1989 Powder Metallurgy Group Meeting. 9-11, 1989, Bowness-on-Windermere.
PRODUCTION OF BARIUM FERRITES BY TilE CHEMICALLY ACTIVATED SINTERING AND TOPOTACTICAL METHODS S Ozbayraktar, et al (Univ. Withwatersrand. South Africa). Paper presented at the 1989 Powder Metallurgy Group Meeting. 9-11 October 1989. Bowness-on-Wlndermere. The possibility. of manufacturing anisotropic barium ferrites by a new method was investigated. The kinetics of the chemically activated sintering and topolactical behaviour and their effect on magnetic qualities are discussed.
RARE EARTH PERMANENT MAGNETS
J Ormerod (Philips Components Ltd. Southport). Paper presented at the 1989 Powder Metallurgy Meeting. 9-11 October 1989, Group Bowness-on-windermere. A review of the PM rare earth permanent magnet market.
The effect of cold forging of Cu·W sintered and hot-worked materials on densily, hardness and electrical conductivity has been evaluated. DEVELOPMENT AND CONTROL OF MICROSTRUCTURE IN PM W BY SYNTHESIS AND REDUCTION OF WOl GELS C Persad, et al, (Ctr.for Mat.Sci and Eng. The Univ. of Texas. Austin, TX. USA). Paper presented at TMS/AIMF Fall Meeting. Indianapolis. October 2-5.1989.
Gels produced fromacidic solutions of metallic W have been investigated as precursor materials for submicron metallic W particles. Temperature and pH control in the gel-producing step leads to the nucleation and controlled growth ofWOl particles down to 50 mm size. Gels of stoichiometric and non-stoichlmetric compositionshavebeen studied. PROBLEMS OF PM·REFRACfORY ALLOYS IN AIRCR1\FTINDUSTRY
J Makl, et al, Pokroky Ptaskove Metolutgie, No 2. 1989. 20-40.
Hard Materials & Cermets HIGHPRESSURE SINTERING OF COMPACT BORON NITRIDE MODIFICATIONS
PM-technology in refractory materials production is discussed. Advantages and disadvantagesof this technology are considered and possible applications in the Czechoslovak aircraft industry are presented.
F Kupcik, E Matos, Pokroky Pttiskove Me/alurgie. No 2, 1989. 6·19. The results of sintering CBN and WBN powders in a high-pressure device are described. Influence of starting raw materials. sintering condilions and additives to the CBN powders was studied. Further. results of sintering the WBN powder are presented. Effect ofsintering parameterson some physicaland chemical characteristics, mechanical strength of grainsand phase composilion of polycrystalline BN is examined. Resultsof cutting tests are discussed.
70
Superalloys
Review
In many ways aerospace applications provide the 'ultimate' test for high temperature alloys. As minimal requirements the materials must be capable of being fabricated and possess (1) good creep and environmental resistance at high temperatures and (2) adequate fracture toughness and fatiguestrength. AlthoughCoo. Fe-,and Ni-baso superalloys meet these criteria for existing technology, the desire for higher operating temperatures to improve efficiency means that a new generationof high temperature materials must be developed. Possible systems include metal matrix composites. monolithyic and composite intermetallics as well as refractory alloys. These approaches. including advantages and problems. are examined in this paper.
DETERMINATION OF TEXTURE IN ZIRCALOY USING COMPl.ETE POLE FIGURES S A Wilson (AD Sandvik Steel. Sweden). Scatid.], Me/alI., 18, 1989. 6-12. -Inorderto be ableto measurethe texturein Zircaloy accurately.a method involvingboth back reflection and transmission techniques has been developed. Pole figures and texture parameters were obtained fromthe (0002) and (1010) planes. It was found that the defocusing correction employed increased the accuracy of the results considerably.
Miscellaneous MAKING SPCWORK· UTILISATION OF MODIFIED CONTROL LIMITS S B Morton (GKN Bound Brook Ltd. Litchfield). Paper presented at 1989 Powder MetallurgyGroup Meeting. 9·11 October, 1989, Bowness-on-\Vindermere. An overview paper on the subject of SPC. CAN WEPREDICT THE STRUCTURE AND PERFORMANCE OF NEW MATERIALS? A P Miodownik(Dept. Mat. Sci. & Eng.• University of Surrey. UK). Paper presented at 1989 Powder Metallurgy Group Meeting. 9-11 October. 1989, Bowness-on Windermere. A review of 'new' material developments. SIMPLE VERSUS HI·TECH SOLUTION TO QUALITY CONTROL PROBLEMS IN A SMALL POWDER METALLURGY PLANT D K Napier (Morganite Special Carbons. London). Paper presented at the 1989 Powder Metallrugy 9-11 October, 1989. Group Meeting.
Bowness-on-\Vindermere. HIGHTEMPERATURE ALLOYS
J D Whittenberger (NASA Lewis Research Center. Cleveland. Ohio. USA). Paper presented at TMS/AIMF Fall Meeting. Indianapolis. October 2-5.1989.
A discussion of the sophisticated statistical techniques that can be applied to help manufacturersimprovethe quality of their product through an increased knowledge of the unit processes required to make that product.
MPR January 1990
AlzOJ·COATED CEMEf'oI"TED CARBIDE INSERTS
J Hofmann. et al, Pokroky Proskove Metalutgie, No This paper presents the results of work on high speed sliding contact materials focusing on the extension of the operating regimeof the \Vgraphite materials for low-voltage, high-speed applications. and on CU·\V speed applications. PRESENT AND FUTURE DEVELOPMENT OF SOFT MAGENTIC PM MATERIALS AND APPLICATIONS A Kordecki, B Weglinski (Techn. Univ. Wroclaw). Paper presented at the 1989 Powder Metallurgy 9-11 October, 1989. Group Meeting. Bnwness-on-Windermere, A description of soft magnetic powder composites, such as sinters, dielectrornagnetics and magnetodielectrics. and problems associated with their applications as magnetic cores of electrical converters, are presented in this paper.
2. 1989. 41-56.
The experimental results presentedsuggestthat the cutting life of AI20 rco ated inserts increases with the total coating thickness. On the base of practical examples the application of AIzOrcoated inserts during the steel turning at the high cutting speeds and during the cast iron turning and milling is demonstrated.
Refractory Metals EFFECT OF COLD FORGING ONTHE PROPERTIES OF Cu·W MECHANICALLY ALLOYED COMPOSITE MATERIALS
J Kaczmar, A Niechajowicz [lnst. MachineBuilding Techn. Wroclaw, Poland). Paper presented at the 1989 Powder Metallurgy Group Meeting. 9-11, 1989, Bowness-on-Windermere.
PRODUCTION OF BARIUM FERRITES BY TilE CHEMICALLY ACTIVATED SINTERING AND TOPOTACTICAL METHODS S Ozbayraktar, et al (Univ. Withwatersrand. South Africa). Paper presented at the 1989 Powder Metallurgy Group Meeting. 9-11 October 1989. Bowness-on-Wlndermere. The possibility. of manufacturing anisotropic barium ferrites by a new method was investigated. The kinetics of the chemically activated sintering and topolactical behaviour and their effect on magnetic qualities are discussed.
RARE EARTH PERMANENT MAGNETS
J Ormerod (Philips Components Ltd. Southport). Paper presented at the 1989 Powder Metallurgy Meeting. 9-11 October 1989, Group Bowness-on-windermere. A review of the PM rare earth permanent magnet market.
The effect of cold forging of Cu·W sintered and hot-worked materials on densily, hardness and electrical conductivity has been evaluated. DEVELOPMENT AND CONTROL OF MICROSTRUCTURE IN PM W BY SYNTHESIS AND REDUCTION OF WOl GELS C Persad, et al, (Ctr.for Mat.Sci and Eng. The Univ. of Texas. Austin, TX. USA). Paper presented at TMS/AIMF Fall Meeting. Indianapolis. October 2-5.1989.
Gels produced fromacidic solutions of metallic W have been investigated as precursor materials for submicron metallic W particles. Temperature and pH control in the gel-producing step leads to the nucleation and controlled growth ofWOl particles down to 50 mm size. Gels of stoichiometric and non-stoichlmetric compositionshavebeen studied. PROBLEMS OF PM·REFRACfORY ALLOYS IN AIRCR1\FTINDUSTRY
J Makl, et al, Pokroky Ptaskove Metolutgie, No 2. 1989. 20-40.
Hard Materials & Cermets HIGHPRESSURE SINTERING OF COMPACT BORON NITRIDE MODIFICATIONS
PM-technology in refractory materials production is discussed. Advantages and disadvantagesof this technology are considered and possible applications in the Czechoslovak aircraft industry are presented.
F Kupcik, E Matos, Pokroky Pttiskove Me/alurgie. No 2, 1989. 6·19. The results of sintering CBN and WBN powders in a high-pressure device are described. Influence of starting raw materials. sintering condilions and additives to the CBN powders was studied. Further. results of sintering the WBN powder are presented. Effect ofsintering parameterson some physicaland chemical characteristics, mechanical strength of grainsand phase composilion of polycrystalline BN is examined. Resultsof cutting tests are discussed.
70
Superalloys
Review
In many ways aerospace applications provide the 'ultimate' test for high temperature alloys. As minimal requirements the materials must be capable of being fabricated and possess (1) good creep and environmental resistance at high temperatures and (2) adequate fracture toughness and fatiguestrength. AlthoughCoo. Fe-,and Ni-baso superalloys meet these criteria for existing technology, the desire for higher operating temperatures to improve efficiency means that a new generationof high temperature materials must be developed. Possible systems include metal matrix composites. monolithyic and composite intermetallics as well as refractory alloys. These approaches. including advantages and problems. are examined in this paper.
DETERMINATION OF TEXTURE IN ZIRCALOY USING COMPl.ETE POLE FIGURES S A Wilson (AD Sandvik Steel. Sweden). Scatid.], Me/alI., 18, 1989. 6-12. -Inorderto be ableto measurethe texturein Zircaloy accurately.a method involvingboth back reflection and transmission techniques has been developed. Pole figures and texture parameters were obtained fromthe (0002) and (1010) planes. It was found that the defocusing correction employed increased the accuracy of the results considerably.
Miscellaneous MAKING SPCWORK· UTILISATION OF MODIFIED CONTROL LIMITS S B Morton (GKN Bound Brook Ltd. Litchfield). Paper presented at 1989 Powder MetallurgyGroup Meeting. 9·11 October, 1989, Bowness-on-\Vindermere. An overview paper on the subject of SPC. CAN WEPREDICT THE STRUCTURE AND PERFORMANCE OF NEW MATERIALS? A P Miodownik(Dept. Mat. Sci. & Eng.• University of Surrey. UK). Paper presented at 1989 Powder Metallurgy Group Meeting. 9-11 October. 1989, Bowness-on Windermere. A review of 'new' material developments. SIMPLE VERSUS HI·TECH SOLUTION TO QUALITY CONTROL PROBLEMS IN A SMALL POWDER METALLURGY PLANT D K Napier (Morganite Special Carbons. London). Paper presented at the 1989 Powder Metallrugy 9-11 October, 1989. Group Meeting.
Bowness-on-\Vindermere. HIGHTEMPERATURE ALLOYS
J D Whittenberger (NASA Lewis Research Center. Cleveland. Ohio. USA). Paper presented at TMS/AIMF Fall Meeting. Indianapolis. October 2-5.1989.
A discussion of the sophisticated statistical techniques that can be applied to help manufacturersimprovethe quality of their product through an increased knowledge of the unit processes required to make that product.
MPR January 1990