Messung der Spraycharakteristik zur Bestimmung des Wärmeübergangskoeffizienten bei der Spraykühlung

Krause, Christian; Gretzki, T.; Nürnberger, Florian; Schaper, Mirko; Bach, Fr.‐W.

doi:10.1007/s10010-006-0035-3

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…The start of the martensite formation process in the tooth's root corresponds with the more intensive cooling of this region. This could be attributed to the larger water deposition density in the tooth's root, which was measured during the investigations in Ref . than that at the tooth's crest region.…”

Section: Simulation Results Verification and Discussionmentioning

confidence: 85%

Modeling of Spray Cooling during Induction Hardening of Spur Gearwheels Made from 42CrMo4 Hardening and Tempering Steel

Rodman

Boiarkin

Nürnberger

et al. 2013

steel research int.

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The application of water-air spray cooling in the process of induction surface hardening according to the simultaneous dual-frequency technology represents a hitherto unexploited and equivalent alternative to conventionally employed polymer solutions. The reason for this is that the selection of the optimum parameters is associated with a high experimental outlay and analytical effort for performing the tests and evaluating the results, respectively, and the parameters must be selected for a specific application. In order to reduce this effort, a numerical model was developed to formulate the coupled thermal, microstructural, and mechanical processes during quenching by means of water-air spray cooling of induction heated spur gearwheels made from 42CrMo4 hardening and tempering steel. The model was implemented in the commercial simulation software ANSYS Workbench 13.0 and verified using simulation results for temperature development, hardness distribution, residual stresses, and distortion. A comparison of the simulated and experimental results show that the model introduced here is suitable for predicting the hardening results during quenching using spray cooling subsequent to induction heating.

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Section: Simulation Results Verification and Discussionmentioning

confidence: 85%

Modeling of Spray Cooling during Induction Hardening of Spur Gearwheels Made from 42CrMo4 Hardening and Tempering Steel

Rodman

Boiarkin

Nürnberger

et al. 2013

steel research int.

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show abstract

“…The investigations were motivated by shortening the process chain of precision forgings by means of substituting a conventional heat treating process subsequent to the forging process by a quench based on spray cooling. Here, knowledge of the spray characteristics and the time and spacial dependencies of the heat transfer coefficients were prerequisites for sucessfully integrating the heat treatment and/or computer aided process design . Self‐tempering for induction hardening by employing water‐air spray cooling was investigated by Kurmashov .…”

Section: Introductionmentioning

confidence: 99%

Tempering Induction Hardened 42CrMo4 Steel Helical Gearwheels from Residual Heat Using Spray Cooling

Rodman

Nürnberger

Dalinger

et al. 2013

steel research int.

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Induction hardening is a surface hardening process in which severe temperature gradients occur due to limiting the heating to the sub-surface layer. High residual stresses result from these gradients, which can negatively influence the fatigue strength and induce cracking. To reduce the residual stresses, induction hardening is followed by a tempering, which is usually carried out for several hours in a furnace. Substituting furnace tempering by tempering from the residual heat motivated the current investigations. During induction hardening of helical gearwheels made of 42CrMo4 heat-treating steel using a controlled quenching by means of spray cooling, an additional tempering from the residual heat was performed. The result of the heat treatment was analyzed with the aid of hardness, residual stress, and distortion measurements. The obtained hardening results demonstrate the equivalence of the two tempering processes considered here.

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Spray cooling of extruded EN AW-6082 aluminium alloy sheets: spatial heat transfer coefficients

Golovko

Frolov

Rodman

et al. 2014

Forsch Ingenieurwes

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Messung der Spraycharakteristik zur Bestimmung des Wärmeübergangskoeffizienten bei der Spraykühlung

Cited by 3 publications

References 2 publications

Modeling of Spray Cooling during Induction Hardening of Spur Gearwheels Made from 42CrMo4 Hardening and Tempering Steel

Modeling of Spray Cooling during Induction Hardening of Spur Gearwheels Made from 42CrMo4 Hardening and Tempering Steel

Tempering Induction Hardened 42CrMo4 Steel Helical Gearwheels from Residual Heat Using Spray Cooling

Spray cooling of extruded EN AW-6082 aluminium alloy sheets: spatial heat transfer coefficients

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