Metallurgical Engineering

Metallurgical Engineering

Effect of Severe Plastic Deformation byHigh Pressure Torsion on the Microstructure, Mechanical Properties and Pseudoelastic Behavior of the Fe-10Ni-7Mn (wt.%) Steel after Intercritical Annealing treatment

Document Type : Research Paper

Authors
Faezeh Javadzadeh Kalahroudi 1
Hamidreza Koohdar 1
Hassan Shirazi 2
Hamidreza Jafarian 3
Mahmoud Nili-Ahmadabadi 4
1 School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran
2 PhD, School of Metallurgy and Materials Engineering, Tohoku University, Sendai, Japan
3 Assistant Professor, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
4 Professor, School of Metallurgy and Materials Engineering, University of Tehran
10.22076/me.2018.91387.1201
Abstract
In this research, the effect of severe plastic deformation by high pressure torsion process on the microstructure, mechanical properties and pseudoelastic behavior of the Fe-10Ni-7Mn (wt.%) alloy after annealing at intercritical temperatures was investigated. The results revealed that applying high pressure torsion process for 20 turns on the solution annealed specimen and intercritical annealed samples at two different temperatures, 580 and 600°C for 2 hours, caused reasonable ductility with significant increase in micro-hardness, ultimate tensile strength and reduced grain size to nanometer. Phase evaluation by XRD and EBSD analysis showed that high pressure torsion process led to reverse transformation of martensite to austenite in solution annealed specimen and austenite to martensite transformation in the intercritical annealed samples. Among studied samples conducted in this research, the intercritical annealed sample at 600°C and subsequently deformed by high pressure torsion, revealed the most significant mechanical properties. Moreover, in this sample due to the higher fraction of austenite, fine grain size and high tensile strength, and easier reversible movement of the fcc/hcp interface, more amount of pseudoelasticity was achieved in comparison to the others samples.
Keywords
Fe-10Ni-7Mn (wt.%) Low carbon martensitic steel
High pressure torsion
Intercritical annealing in the dual-phase region
Mechanical properties
Psuedoelastic behavior
 
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  • Receive Date 06 August 2018
  • Revise Date 23 September 2018
  • Accept Date 10 December 2018