Determination of Proper Austenitization Temperatures for Hot Stamping of AISI 4140 Steel

Samadian, Pedram; Parsa, Mohammad Habibi; Shakeri, Amid

doi:10.1007/s11665-014-0896-9

Cited by 10 publications

(1 citation statement)

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“…Such tests are time consuming and expensive. As the proper austenitization temperatures for the hot stamping process result in an almost completely martensitic microstructure ( Ref 5,6,8), if the possibility of the prediction of steel microstructures after this process exists, it will be no longer necessary to implement all of these tests. Different kinetics models for the prediction of the austenite decomposition during isothermal processes have been presented, which can be also applied under non-isothermal conditions considering the additively principle ( .…”

Section: Introductionmentioning

confidence: 99%

Prediction of Proper Temperatures for the Hot Stamping Process Based on the Kinetics Models

Samadian

Parsa

Mirzadeh

2014

J. of Materi Eng and Perform

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Nowadays, the application of kinetics models for predicting microstructures of steels subjected to thermomechanical treatments has increased to minimize direct experimentation, which is costly and time consuming. In the current work, the final microstructures of AISI 4140 steel sheets after the hot stamping process were predicted using the Kirkaldy and Li kinetics models combined with new thermodynamically based models in order for the determination of the appropriate process temperatures. In this way, the effect of deformation during hot stamping on the Ae 3 , Acm, and Ae 1 temperatures was considered, and then the equilibrium volume fractions of phases at different temperatures were calculated. Moreover, the ferrite transformation rate equations of the Kirkaldy and Li models were modified by a term proposed by Å kerström to consider the influence of plastic deformation. Results showed that the modified Kirkaldy model is satisfactory for the determination of appropriate austenitization temperatures for the hot stamping process of AISI 4140 steel sheets because of agreeable microstructure predictions in comparison with the experimental observations.

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Section: Introductionmentioning

confidence: 99%