The influence of depth of cut on the machinability of an alloyed austempered ductile iron

Avishan, Behzad; Yazdani, S.; Vahid, Davood Jalali

doi:10.1016/j.msea.2009.05.044

Cited by 28 publications

(13 citation statements)

References 9 publications

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“…Therefore, this transformation right in front of the tool face makes the material even more difficult to be machined and this harder phase penetrate around 1?5 to 2 mm under the machining surface. 14 Avishan et al 15 have shown that the hardness of the machined surface will be increased as a result of a TRIP effect on the surface of the specimens during machining under applied force. The variation of the surface hardness at three depths of cut were studied and it was shown that specimens austempered at 375uC have a lower hardness compared to that of specimens which were austempered at 300 and 340uC (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…These reduce the hardness and improve the ductility effectively. 15,16 That is why the temperature at the tip of the machining tools rises severely in contact with the specimen surface during the machining of the test pieces which were austempered at lower temperature. Further study about the chip breaking mechanism and its relation to the microstructure and hardness is necessary to make this clear.…”

Section: Discussionmentioning

confidence: 99%

“…(iii) The machinability of ADI austempered at 375uC is better than that of ADI austempered at 340 and 300uC 5 Hardness variation in cutting surface with respect to amount of depth of cut 15 because of the lower hardness of the former. This lower hardess results in reduced tool wear and better surface finish.…”

Section: Discussionmentioning

confidence: 99%

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Effect of austempering temperature on machinability of Cu–Ni–Mo alloyed austempered ductile iron for heavy section parts

Avishan

Yazdani

Vahid

2011

International Journal of Cast Metals Research

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The machinability of an austempered ductile iron with a suitable chemical composition for heavy sections has been assessed. Austempering heat treatment was carried out at three temperatures, 300, 340 and 375uC, after austenitising at 870uC for 100 min. Drilling tests, tool wear and surface roughness measurements were used to evaluate the machinability. Drilling operation failure, severe tool wear and the poorer surface roughness of the specimens austempered at lower temperatures indicated that austempering at higher temperatures clearly resulted in better machinability. The machinability of testpieces austempered at 375uC, which contained higher fractions of retained austenite, was superior to that of testpieces autenitised at lower temperatures, indicating that hardness is an important factor in assessing machinability in addition to high carbon austenite content.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of austempering temperature on machinability of Cu–Ni–Mo alloyed austempered ductile iron for heavy section parts

Avishan

Yazdani

Vahid

2011

International Journal of Cast Metals Research

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“…When the literature is reviewed, it is noted that research on this subject has been in progress [5,6]. It is known from literature that the mechanical properties of ductile iron are improved after applying austempering heat treatment [7,8]. However, a study of the effect of induction hardening process * corresponding author; e-mail: bahadir.karaca@estas.com.tr on the properties of ADI can not be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Austempering and Induction Hardening on the Wear Properties of Camshaft Made of Ductile Cast Iron

Karaca

Şi̇mşi̇r

2017

Acta Phys. Pol. A

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The aim of this study is to investigate the effects of heat austempering and induction hardening on the wear properties of GGG60 ductile cast iron for camshaft production. For this purpose, camshafts have been produced by sand mould casting method. Fe-Si-Mg alloy has been used for inoculation process to achieve iron nodulization. The casting has been done between 1410-1420• C. The casted camshafts have been austenitized at two different temperatures (800 and 900• C) and time intervals (60 and 90 min) under controlled furnace atmosphere. The austenitized camshafts have been quenched into the molten salt bath at 360• C, held there for 90 min and then cooled in air. This way, austempering heat treatment has been applied. After that, surface hardening process was conducted using induction hardening machine with medium frequency. Microstructure of camshafts has been examined by optical methods and mechanical tests have been performed. Results show that austempering heat treatment increases the wear resistance of camshaft, compared to as-cast condition. Wear resistance of the camshaft increases with increasing austenitizing temperature, time and with induction hardening. The lowest weight loss of 0.62 mg has been obtained for the induction hardened camshaft austenitized at 900• C for 90 min.

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“…The determination of the presence of this particular type of austenite and of its content in the microstructure is not possible by the conventional testing methods, such as e.g. X-raying, and the more in the production process [7,8]. Therefore effective methods are intensely sought to determine the share of metastable austenite in the microstructure of ausferritic ductile iron and thus enable better control of its impact and of the impact of other phases on the machining process [9].…”

Section: Introductionmentioning

confidence: 99%

Preliminary evaluation of the applicability of F, V and AEsignals in diagnosis of ADI machining process

Myszka¹,

Bombiński²

2014

Archives of Foundry Engineering

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In this study, a preliminary evaluation was made of the applicability ofthe signalsof the cutting forces, vibration and acoustic emission in diagnosis of the hardness and microstructure of ausferritic ductile iron and tool edge wear rate during its machining. Tests were performed on pearlitic-ferritic ductile iron and on three types of ausferritic ductile iron obtained by austempering at 400, 370 and 320⁰C for 180 minutes. Signals of the cutting forces (F), vibration (V) and acoustic emission (AE) were registered while milling each type of the cast iron with a milling cutter at different degrees of wear. Based on individual signals from all the sensors, numerous measures were determined such as e.g. the average or maximum signal value. It was found that different measures from all the sensors tested depended on the microstructure and hardness of the examined material, and on the tool condition. Knowing hardness of the material and the cutting tool edge condition, it is possible to determine the structure of the material .Simultaneous diagnosis of microstructure, hardness, and the tool condition is probably feasible, but it would require the application of a diagnostic strategy based on the integration of numerous measures, e.g. using neural networks.

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The influence of depth of cut on the machinability of an alloyed austempered ductile iron

Cited by 28 publications

References 9 publications

Effect of austempering temperature on machinability of Cu–Ni–Mo alloyed austempered ductile iron for heavy section parts

Effect of austempering temperature on machinability of Cu–Ni–Mo alloyed austempered ductile iron for heavy section parts

The Effects of Austempering and Induction Hardening on the Wear Properties of Camshaft Made of Ductile Cast Iron

Preliminary evaluation of the applicability of F, V and AEsignals in diagnosis of ADI machining process

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