Characterization of cryogenically treated cemented carbide

Muthuswamy, Padmakumar; Dinakaran, D.; Guruprasath, J.

doi:10.1080/10584587.2017.1370340

Cited by 14 publications

(3 citation statements)

References 11 publications

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“…Like iron, as cobalt, a key element used as a binder in the manufacturing of cemented carbide tools is ferromagnetic, the phase transformation (from FCC to HCP) would occur for it as well which would have played a key role in increasing the hardness and hence the performance improvement. Phase transformation of cobalt in cryo-treated tungsten carbide tools was seen by other researchers as well [15,16,[25][26][27] which resulted in slight increase in the hardness and improved wear resistance.…”

Section: Metallurgical Evaluationmentioning

confidence: 63%

Investigation on the effect of cryogenic treatment on tungsten carbide milling insert with 11% cobalt (WC–11%Co)

Muthuswamy¹,

Dinakaran

2020

SN Appl. Sci.

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The objective of this research is to evaluate the performance of cryogenically treated cemented carbide milling inserts with 11% cobalt content in face milling of EN19 steel. Two different deep cryogenic treatments at temperature of around − 193 °C were performed on the inserts, namely cryogenic treatment and cryogenic treatment and tempering. Uncoated tungsten carbide face milling inserts with 11% cobalt content were used in this research. Machining tests were conducted at the catalog recommended cutting parameters, and flank wear and nose wear of untreated, cryogenically treated and cryogenically treated and tempered inserts were compared to study the performance. The experimental investigation revealed that both cryogenic treated and cryogenic treated and tempered inserts showed 4-7% lesser flank and nose wear than the untreated inserts. The metallurgical examinations using indirect measurement technique revealed the phase transformation of cobalt from FCC to HCP which could have resulted in increased hardness, reduced friction coefficient and improved tool life.

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Section: Metallurgical Evaluationmentioning

confidence: 63%

Investigation on the effect of cryogenic treatment on tungsten carbide milling insert with 11% cobalt (WC–11%Co)

Muthuswamy¹,

Dinakaran

2020

SN Appl. Sci.

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“…The hardness values of all treated specimens were advanced than that of the untreated specimen. This status was because cryogenic treatment formed new eta carbide particles in the microstructure of the turning adds and monotonous and homogeneously distribution of small-sized carbide particles [23]. The fine η carbides present in the inserts obtained using cryogenic treatment develops the hardness and wear resistance without significantly influencing the toughness.…”

Section: Hardness Test Resultsmentioning

confidence: 99%

Effects of Different Cryogenic Treatments on Drilling Performance of HSS Drills

Avci

Soyusinmez²,

Ertuğrul

2020

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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Cryogenic treatment has been widely used in recent years to improve the properties of cutting 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 o C and 250 o C) 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 microhardness 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.

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“…The reports propose several reasons for the improvement in wear resistance of the CC. One of them is the ability of the cobalt binder to undergo allotropic transformations [10,17]. Along with iron, the crystal structure of cobalt can change with temperature from the hexagonal close-packed configuration (εCo) to a face-centred one (αCo), which is stable above 422°C [18].…”

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confidence: 99%

Properties of Cryogenic Treated Cemented Carbides (WC-Co)

Průcha

Bricín

Kříž

et al. 2020

DDF

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The present paper explores the effects of deep cryogenic treatment (DCT) on the properties of WC-Co cemented carbides. The investigation involved four different cemented carbide (CC) grades. Two of them were coarse-grained WC with grain sizes larger than 6 μm and binder fractions of 10 and 15 wt. %. The other two were fine-grained with WC grains of 0.5-0.8 μm and the same binder fractions of 10 and 15 wt. %. Their specimens were ground and polished to prepare them for DCT. In each specimen, one half of this polished surface was used for testing the properties of the CC before cryogenic treatment. The post-DCT properties were then determined on the other half. Properties of the cemented carbides prior to and after DCT were studied using optical and scanning electron microscopy, X-ray diffraction, hardness testing according to Vickers scale followed by calculation of fracture toughness KIC and a ball-on-disk test of the wear resistance of the surface. One of the findings was that cryogenic treatment led to a decrease in residual stresses and to lower fracture toughness KIC in the CC.

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Characterization of cryogenically treated cemented carbide

Cited by 14 publications

References 11 publications

Investigation on the effect of cryogenic treatment on tungsten carbide milling insert with 11% cobalt (WC–11%Co)

Investigation on the effect of cryogenic treatment on tungsten carbide milling insert with 11% cobalt (WC–11%Co)

Effects of Different Cryogenic Treatments on Drilling Performance of HSS Drills

Properties of Cryogenic Treated Cemented Carbides (WC-Co)

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