| Correlation between Microstructure and Mechanical
Properties of YSZ/Al2O3 Ceramics and Its Effect on
High Speed Machining of Steel |
Bipin Kumar Singh,1, 2 Kunal Ghosh,1 Shibendu Shekhar Roy,2
Biswanath Mondal1 and Nilrudra Mandal2,*
Pages: 219-225
DOI : 10.1080/0371750X.2018.1528889 |
| Abstract |
| An attempt has been made to correlate the mechanical properties with
microstructure and machining performance of zirconia toughened alumina
composite fabricated from different ratios of Al2O3 with yttria stabilized zirconia
(YSZ) powder. The developed 3 mol% YSZ powder has been mixed with Al2O3 in
the ratios of 10:90, 15:85 and 20:80 for fabrication of cutting inserts. Study reveals
the relation between microstructure of the composites with the mechanical
properties, i.e. hardness, fracture toughness, flexural strength. Conventional lathe
NH-26 is used to evaluate the machining performance, i.e. flank wear, surface
roughness and cutting force of all three types of developed inserts by machining
of AISI 4340 steel bar. The maximum hardness, 15.55 GPa, has been obtained for
90% Al2O3 with 10% YSZ. The maximum values of fracture toughness (5.96 MPa.m1/2)
and flexural strength (510 MPa) are noticed for 80% Al2O3 with 20% YSZ. The
analysis also shows that when the YSZ percentage increases, the smaller grain
size of YSZ particle and crack bridging phenomena enhances the mechanical
properties like fracture toughness and flexural strength of the composites. The
composition comprising of YSZ:Al2O3::10:90 shows less flank wear, best surface
finish and lowest cutting force.
[Keywords: Yttria stabilized zirconia, Alumina, Flank wear, Surface roughness,
Cutting force] |
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