Dynamic Behavior and High Speed Machining of Ti-6246 and Alloy 625 Superalloys: Experimental and Modeling Approaches

Hokka, Mikko; Gomon, D.; Shrot, Aviral; Leemet, Tõnu; Bäker, Martin; Kuokkala, Veli‐Tapani

doi:10.1007/s11340-013-9793-7

Cited by 28 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The tests were carried out with a Split Hopkinson Pressure Bar device with high temperature capabilities. The exact description of the test equipment is given in references [4,17,18,19].…”

Section: Methodsmentioning

confidence: 99%

Numerical modeling of the dynamic strain aging in steels at high strain rates and high temperatures

Rubio

Hokka

2021

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

Carbon steels can be heat treated to produce different microstructural variations and mechanical properties. At high temperatures the material plasticity and strength can be influenced by diffusional effects like the Portevin-Le Chatelier effect, leading to a commonly observed increased strength at elevated temperatures. The diffusional effects are influenced by the chemical composition, but also the heat treatment history that affects the local composition and especially the concentrations of free solute atoms. In this work, a numerical approach was implemented to reproduce the thermomechanical behaviour of two different microstructural variants of steel grade C45. The experimental data used to calibrate the model includes information of the plastic behaviour of material subjected to dynamic compression loading at a wide range of temperatures. Special emphasis was focused to describe the effects of the dynamic strain aging (DSA) on the flow stress. A strategy based on machine learning was implemented to obtain a model that reproduces the strengthening of the material due to diffusional effects. Cubic Support Vector Machine models were trained for both microstructure variants of the steel and different surfaces were obtained to describe the topology of the flow stress as function of temperature and strain rate. The model predictions were compared to the behaviour described by the Johnson-Cook model to estimate the influence of the DSA effect on the strength of the material at high strain rates and temperatures. Furthermore, the model quantifies how the microstructure affects the strength of the material and the strength of the DSA-hardening.

show abstract

“…The tests were carried out with a Split Hopkinson Pressure Bar device with high temperature capabilities. The exact description of the test equipment is given in references [4,17,18,19].…”

Section: Methodsmentioning

confidence: 99%

Numerical modeling of the dynamic strain aging in steels at high strain rates and high temperatures

Rubio

Hokka

2021

EPJ Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, in machining of the nickel based superalloys, it becomes essential to understand the material removal process and selecting the optimum cutting parameters to meet the desired dimensional accuracy, surface quality and surface integrity of the finished product. Many studies have been carried out towards understanding the optimum cutting parameters of nickel-based superalloys in analytical [8] and simulative approaches [2,[9][10][11][12][13][14][15][16][17][18] as well as experimental [19][20][21][22][23][24][25][26][27][28][29][30][31] studies. In those studies, various cutting process parameters (e.g.…”

Section: Introductionmentioning

confidence: 99%

Effects of cutting parameters on machinability characteristics of Ni-based superalloys: a review

Kaya

Akyüz

2017

Open Engineering

View full text Add to dashboard Cite

Nickel based superalloys offer high strength, corrosion resistance, thermal stability and superb thermal fatigue properties. However, they have been one of the most difficult materials to machine due to these properties. Although we are witnessing improved machining strategies with the developing machining, tooling and inspection technologies, machining of nickel based superalloys is still a challenging task due to in-process strains and post process part quality demands. Selecting optimum machining parameters for quality, productivity and profitability is of paramount importance. Many studies have been conducted on various aspects of machinability of nickel based superalloys including defining the optimum cutting parameters, to develop a better understanding of machining them. The recent studies suggest new findings, and discuss previously reported results, related to the concerns of superalloy machining. This review presents the influences of the most significant cutting parameters on various machinability characteristics with respect to the recent studies as well as the previous ones. The reviewed machinability characteristics may be listed as: tool wear, cutting forces and surface integrity.

show abstract

“…In a different paper Ducobu et al [3] examined the effect of adaptive mass scaling in finite element analysis of Ti6Al4V orthogonal cutting. Hokka et al [4] introduced modelling, simulation and measurement of highspeed machining of Ti-6246 and Alloy 625 Superalloys. Ljustina et al [5] summarized the know-how about continuum damage models and mesh dependence in Finite Element Analyses.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Finite Element Analysis of Turning Processes

Borsos

Csörgő

Hidas

et al. 2017

Period. Polytech. Mech. Eng.

View full text Add to dashboard Cite

show abstract

Dynamic Behavior and High Speed Machining of Ti-6246 and Alloy 625 Superalloys: Experimental and Modeling Approaches

Cited by 28 publications

References 22 publications

Numerical modeling of the dynamic strain aging in steels at high strain rates and high temperatures

Numerical modeling of the dynamic strain aging in steels at high strain rates and high temperatures

Effects of cutting parameters on machinability characteristics of Ni-based superalloys: a review

Two-Dimensional Finite Element Analysis of Turning Processes

Contact Info

Product

Resources

About