Approach for modelling the Taylor-Quinney coefficient of high strength steels

Behrens, Bernd‐Arno; Chugreev, Alexander; Bohne, Florian; Lorenz, Ralph D.

doi:10.1016/j.promfg.2019.02.163

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…This relationship obviously neglects all effects of the significantly larger normal force F n exerted onto the surface and therewith associated with plastic deformation. It is generally assumed that the ratio of dissipated heat to plastic work (known as the Taylor-Quinney coefficient β ) is a constant and has a value of 0.9, while it has been shown that it depends on the material and on strain and strain rate for steels [ 33 ]. The Taylor-Quinney coefficient for Si is unknown, but since plasticity is observed during the cutting of silicon especially in ductile cutting, it is likely that it is a substantial heat source that is neglected in the model.…”

Section: Resultsmentioning

confidence: 99%

Grain flash temperatures in diamond wire sawing of silicon

Pala

Süssmaier

Wegener

2021

Int J Adv Manuf Technol

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Diamond wire sawing has obtained 90% of the single-crystal silicon–based photovoltaic market, mainly for its high production efficiency, high wafer quality, and low tool wear. The diamond wire wear is strongly influenced by the temperatures in the grain-workpiece contact zone; and yet, research studies on experimental investigations and modeling are currently lacking. In this direction, a temperature model is developed for the evaluation of the flash temperatures at the grain tip with respect to the grain penetration depth. An experimental single-grain scratch test setup is designed to validate the model that can emulate the long contact lengths as in the wire sawing process, at high speeds. Furthermore, the influence of brittle and ductile material removal modes on cutting zone temperatures is evaluated.

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Section: Resultsmentioning

confidence: 99%

Grain flash temperatures in diamond wire sawing of silicon

Pala

Süssmaier

Wegener

2021

Int J Adv Manuf Technol

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“…The formation of necking at the moment of the material’s loss of stability is a complex and often sudden phenomenon. After necking, a large amount of heat is generated due to large plastic deformations [ 38 ]. However low strain rates soften the path-rerouting constraints thus only a small amount of energy is converted to heat [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

Coupled Thermomechanical Response Measurement of Deformation of Nickel-Based Superalloys Using Full-Field Digital Image Correlation and Infrared Thermography

et al. 2021

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The paper is devoted to highlighting the potential application of the quantitative imaging technique through results associated with work hardening, strain rate and heat generated during elastic and plastic deformation. The aim of the research presented in this article is to determine the relationship between deformation in the uniaxial tensile test of samples made of 1-mm-thick nickel-based superalloys and their change in temperature during deformation. The relationship between yield stress and the Taylor–Quinney coefficient and their change with the strain rate were determined. The research material was 1-mm-thick sheets of three grades of Inconel alloys: 625 HX and 718. The Aramis (GOM GmbH, a company of the ZEISS Group) measurement system and high-sensitivity infrared thermal imaging camera were used for the tests. The uniaxial tensile tests were carried out at three different strain rates. A clear tendency to increase the sample temperature with an increase in the strain rate was observed. This conclusion applies to all materials and directions of sample cutting investigated with respect to the sheet-rolling direction. An almost linear correlation was found between the percent strain and the value of the maximum surface temperature of the specimens. The method used is helpful in assessing the extent of homogeneity of the strain and the material effort during its deformation based on the measurement of the surface temperature.

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“…The summation of energy dissipation rate over phases multiplied by and latent heat of phase transformation leads to the rise of temperature. In this formulation, is Taylor-Quinney factor which is considered to be 0.9 [34].…”

Section: Prediction Of Temperature Risementioning

confidence: 99%