| dc.contributor |
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica |
| dc.contributor |
Mateo García, Antonio Manuel |
| dc.contributor.author |
Besharatloo, Hossein |
| dc.date |
2014-12-05 |
| dc.identifier.uri |
http://hdl.handle.net/2099.1/24457 |
| dc.language.iso |
eng |
| dc.publisher |
Universitat Politècnica de Catalunya |
| dc.rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain |
| dc.rights |
info:eu-repo/semantics/openAccess |
| dc.rights |
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
| dc.subject |
Àrees temàtiques de la UPC::Enginyeria dels materials |
| dc.subject |
Manganese steel |
| dc.subject |
TWIP steel |
| dc.subject |
Hardness |
| dc.subject |
EBSD |
| dc.subject |
AFM |
| dc.subject |
Acer austenític |
| dc.subject |
Acer d'alta resistència -- Propietats mecàniques |
| dc.subject |
Acer -- Tractament tèrmic |
| dc.title |
Thermal treatment effects on high-Mn TWIP steels |
| dc.type |
info:eu-repo/semantics/masterThesis |
| dc.description.abstract |
This master thesis is going to study and investigate the thermal treatment’s effects on
the high Mn-TWIP steels. In order to get these aims some factors can be studied, such
microstructures and mechanical properties of high Mn-TWIP steels. The objective of
this study are as follows:
Study the microstructure evolution of high Mn-TWIP steels thermally treated (i.e.
grain size, phase transformation, etc).
Study the mechanical properties (hardness, tensile properties and high cycle
fatigue) of high Mn-TWIP steels with different microstructures.
Thermal fatigue evolution (from 0 up to 75 cycles) at 500°C in order to determine
the microstructure evolution and their mechanical properties (harness and
tensile properties).
In present project, in order to study the microstructure the field emission scanning
electron microscopy (FESEM) used. For testing the mechanical properties, Vickers
hardness method applied for hardness test, tension condition for tensile test and high
cycle fatigue has been used for fatigue properties.
Microstructural study indicates that thermal treatment can change the microstructure
of the samples, it observed that the grain size changed in various condition. Martensitic
and pearlitic transformation occurred under thermal treatments and thermal fatigue
conditions respectively. In samples which were thermally fatigued, the concentration
of the pearlitic phase increased by increasing the number of cycles.
Thermal treatments can have some effects on mechanical properties. Hardness of the
materials decrease by increasing the temperature in thermal treatments while thermal
fatigue increases the hardness of materials by increasing the number of cycles.
Samples which were thermally treated and thermally fatigued showed more brittle
behavior compared with the samples which were not thermally treated. It have seen
that the voids, TiN and pearlitic phase are the main reasons of fracture under tensile
tests. Finally it observed that the life time of the materials can be affected by annealing
the samples at 1000°C and normalizing this sample in air. |
