Integrated modelling of transitions in mechanical conditions during casting and heat treatment

Thorborg, Jesper; Klinkhammer, J; Heitzer, M.

doi:10.1088/1757-899x/84/1/012037

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“…van Haaften et al [3] introduced a temperature-dependent hardening parameter into the Garofalo equation to duplicate the change of the recovery behavior from low to high temperatures. Thorborg et al [12] proposed the usage of the temperature-dependent factor that showed the contribution ratio of the inelastic strain increment to the strain-hardening. Ejaer and Mo [13] and Drezet et al [14] used the ''cut-off temperature'' above which the strain-hardening was not taken into account.…”

Section: A Alloy Constitutive Equations Used For Thermal Stress Analmentioning

confidence: 99%

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Motoyama

Shiga

Sato

et al. 2017

Metall Mater Trans A

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Recovery behavior (recovery) and strain-rate dependence of the stress-strain curve (strain-rate dependence) are incorporated into constitutive equations of alloys to predict residual stress and thermal stress during casting. Nevertheless, few studies have systematically investigated the effects of these metallurgical phenomena on the prediction accuracy of thermal stress in a casting. This study compares the thermal stress analysis results with in situ thermal stress measurement results of an Al-Si-Cu specimen during casting. The results underscore the importance for the alloy constitutive equation of incorporating strain-rate dependence to predict thermal stress that develops at high temperatures where the alloy shows strong strain-rate dependence of the stress-strain curve. However, the prediction accuracy of the thermal stress developed at low temperatures did not improve by considering the strain-rate dependence. Incorporating recovery into the constitutive equation improved the accuracy of the simulated thermal stress at low temperatures. Results of comparison implied that the constitutive equation should include strain-rate dependence to simulate defects that develop from thermal stress at high temperatures, such as hot tearing and hot cracking. Recovery should be incorporated into the alloy constitutive equation to predict the casting residual stress and deformation caused by the thermal stress developed mainly in the low temperature range.

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Section: A Alloy Constitutive Equations Used For Thermal Stress Analmentioning

confidence: 99%

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Motoyama

Shiga

Sato

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

Integrated modelling of transitions in mechanical conditions during casting and heat treatment

Cited by 1 publication

References 1 publication

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

Effects of Recovery Behavior and Strain-Rate Dependence of Stress–Strain Curve on Prediction Accuracy of Thermal Stress Analysis During Casting

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