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The flow stress assessment of austenitic-martensitic functionally graded steel under hot compression

In this research, the flow stress of dual layer austenitic-martensitic functionally graded steels (FGSs) under hot deformation loading has been modelled considering the Zener-Hollomon constitutive equations as a function of temperature and strain rate. | The flow stress assessment of austenitic-martensitic functionally graded steel under hot compression Engineering Solid Mechanics 2 2014 83-90 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm The flow stress assessment of austenitic-martensitic functionally graded steel under hot compression H. Salavatia F. Bertob and Y. Alizadeha a Department of Mechanical Engineering Amirkabir University of Technology Tehran Iran b Department of Management and Engineering University of Padova Vicenza Italy ART ICLE INFO ABSTRACT Article history In this research the flow stress of dual layer austenitic-martensitic functionally graded steels Received September 20 2013 FGSs under hot deformation loading has been modelled considering the Zener-Hollomon Received in Revised form constitutive equations as a function of temperature and strain rate. Functionally graded October 14 2013 austenitic-martensitic steels consist of austenite γ and martensite M phases placed on each Accepted 9 February 2014 Available online other in different configurations and produced via Electro Slag Remelting ESR . The boundary 12 February 2014 layers properties are obtained by experimental investigation on single phase materials. Finally Keywords the theoretical model is compared with the experimental results measured in the temperature Hot deformation range 1000-1200 C and strain rate 0.01-1 s-1 and a good agreement is found. Functionally graded steel Rule of mixture Zener-Hollomon constitutive equations 2014 Growing Science Ltd. All rights reserved. 1. Introduction Mechanical behavior of materials under elastic and plastic deformation creep fracture fatigue deserves a great interest in the scientific community and many of researchers work on these topics. Torabi and Aliha 2013 developed a guideline for approving the railway axles made of C35 steel and containing surface and or in-body defects after manufacturing. First they modelled several .