Numerical and Experimental Analysis of Damage Evolution and Martensitic Transformation in AISI 304 Austenitic Stainless Steel at Cryogenic Temperature

Document Type : Research Article

Authors

1 Department of Mechanical Engineering, University of Tehran, Tehran, Iran

2 PhD Student Department of Mechanical Engineering, University of Tehran, Tehran, Iran

3 PhD PROFESSOR at Department of Mechanical Engineering, University of Tehran, Tehran, Iran

Abstract

In this research, properties of ductile damage evolution and martensitic phase transformation in an AISI 304 stainless steel at cryogenic temperature has been studied experimentally and numerically. Simple loading-unloading tension tests for specimens floating in liquid nitrogen have been performed. Accordingly, the cryogenic chamber has been designed and constructed to plunge the tensile test samples into the liquid nitrogen. From simple loading-unloading tension tests, the graph of force-deformation and the evolution of damage parameter during elastic unloadings have been determined. Afterwards, the x-ray diffraction tests have been performed on the stretched sample tests to evaluate the evolution of martensite phase in the resultant biphase material. In the numerical analysis, combining the phase transformation model of Garion and Skoczen and isotropic damage model of Lemaitre, a constitutive model for monotonic loadings has been introduced. The Garion and Skoczen model has been developed based on the assumption of small strains (under 0.2) for cryogenic condition. Furthermore, the hardening law for the biphase material has been obtained from the Mori-Tanaka homogenization. The numerical analysis in this study was carried out implementing the combined constitutive model by means of a user-defined material model subroutine in Abaqus/Standard. Finally, comparing the numerical simulation with the experimental data, parameters of the model has been calibrated.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 1
April 2020
Pages 265-278

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