Abstract: The main objective of the work was to determine the effects of powder composition on a microstructure and properties of iron-base materials used as matrices in diamond impregnated tools. Mixed powders and 30 hours Fe-Cu-Ni milled powders were used for the experiments. The influence of manufacturing process parameters on microstructure and mechanical properties of sinters was investigated. Sintering was performed in a graphite mould using a hot-pressing technique. The powders were consolidated to a virtually pore-free condition during 3 min holding under 35 MPa and at 900°C. The investigations included: density, hardness, static tensile test and X-ray diffraction (XRD) analysis. Observations were also made of microstructure and fracture surfaces of broken samples using a scanning electron microscope (SEM) were also conducted. The SEM observations revealed an evident dependence of grain size and microstructural homogeneity on milling time. The obtained test results indicate that the sinters are virtually densified, have good plasticity with relatively high hardness and yield strength, but sinters of non-ground powders are characterized by a coarse-grained microstructure.
B I B L I O G R A F I A[1] Hughes F H 1980 The early history of diamond tools IDR 11 405-7
[2] Xu P, Hong Y B and Chen S 2004 Performance of diamond segments in different machining processes Mater Sci Forum 471-472 77-81
[3] Tönshoff H K et al 2002 Diamond tools in stone and civil engineering industry: Cutting principles,
wear and applications Diam Relat Mater 11 736-41
[4] Oliveira L J et al 2007 Processing and characterization of impregnated diamond cutting tools
using a ferrous metal matrix Int J Refract Met H 25 328-35
[5] Oliveira F A C, Anjinho C A, Coelho, Amaral P M and Coelho M 2017 PM materials selection:
The key for improved performance of diamond tools Metal Powder Report 72 339-44
[6] Mechnik A 2014 Production of diamond-(Fe-Cu-Ni-Sn) composites with high wear resistance
Powder Metall Met C+ 52 577-87
[7] Barbosa A P et al 2010 Structure, microstructure and mechanical properties of PM Fe–Cu–Co
alloys Materials and Design 31 522-6
[8] Li Z H, Zhao B, Li L and Wong J 2011 China’s diamond in the world market Key Engineering
Materials 487 526-32
[9] Borowiecka-Jamrozek J and Lachowski J 2016 Properties of sinters produced from commercially
available powder mixtures Archives of Foundry Engineering 16 37-40
[10] Borowiecka-Jamrozek J and Konstanty J 2014 Microstructure and properties of a new iron-base
material used for the fabrication of sintered diamond tools Adv Mat Res S-Switz 1052 520-3
[11] Borowiecka-Jamrozek J 2013 Engineering structure and properties of materials used as a matrix
in diamond impregnated tools Arch Metall Mater 58 5-8 
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