EFFECTS OF DIFFERENT CRYOGENIC TREATMENTS ON DRILLING PERFORMANCE OF HSS DRILLS

Year 2020, Volume: 21 Issue: 1, 223 - 237, 31.03.2020

Simge Avcı , Tuğrul Soyusinmez , Onur Ertuğrul

https://doi.org/10.18038/estubtda.648100

Abstract

Cryogenic
processing is a heat treatment which has been widely used in recent years to
improve the properties of tool materials. This process has been reported in the
literature as it provides significant contributions to wear resistance and tool
life of tool steels. This study presents the differences in tool performance
between untreated and cryogenically treated M2 high speed steel (HSS) drill
bits in terms of their tool wear, tool life, hardness and chip formation
properties. Also, the effects of two different tempering temperatures (200 ^oC
and 250 ^oC) in cryogenic treatment on tool performance are
discussed. Drilling performances were studied on different workpieces of SAE
1050, lamellar cast iron and sphero cast iron, and the type of wear is
characterized by a high resolution camera. Moreover, fracture tests were
performed on a steel workpiece using a constant drilling speed of 1100 m/min and a feed rate
of 0.5mm/rev. The microstructures of the samples were characterized using
optical microscopy and SEM. The Vickers micro-hardness tests of the samples
were performed using 100 g
load. Microstructural studies showed that cryogenically treated samples exhibit
better microstructure with finer and more
homogeneous carbides which yields better tool wear and hardness properties. In
paralel, cryogenically treated drills showed improved tool life than untreated
drills during fracture tests. When tempering temperatures are compared,
tempering at 250 °C resulted in better performance than 200 °C of tempering
temperature. Also, the reduction in diameter values during drilling tests were
consistent with the tool life tests.

Keywords

Cryogenic treatment, Tempering temperature, Tool wear;, Tool life, M2 high-speed steel

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