Constitutive Modeling of Flow Behaviour of AISI 4340 Steel under Hot Working Conditions

Apichat Sanrutsadakorn; Viton Uthaisangsuk; Surasak Suranuntchai; Borpit Thossatheppitak

doi:10.4028/www.scientific.net/AMM.249-250.863

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 249-250Constitutive Modeling of Flow Behaviour of AISI...

Constitutive Modeling of Flow Behaviour of AISI 4340 Steel under Hot Working Conditions

Abstract:

Using compression test on a thermo-mechanical simulator/dilatometer, hot deformation behavior of steel AISI 4340 was studied in the temperature range of 850-1150°C and strain rate range of 0.01-10 s-1. The resulted true stress-strain curves exhibited a peak stress at low strain values, after which the flow stresses decreased monotonically until higher strains, representing the dynamic flow softening. The stress level decreased with increasing deformation temperature and decreasing strain rate. The material flow behavior at elevated temperatures was described using a Zener-Hollomon parameter with an exponent-type equation. Additionally, the model was modified by compensating strain rate parameter. The stress-strain responses for the investigated steel predicted by the proposed model agreed well with the experimental results. It was confirmed that the modified constitutive equations provided a more accurate prediction of the flow stress under hot working conditions for steel AISI 4340.