Modelization of the thermomechanical behavior of steel during quenching process for the real-time prediction of quenching cracks
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Modelization of the thermomechanical behavior of steel during quenching process for the real-time prediction of quenching cracksAutoría
Tutor/Supervisor; Universidad.Departamento
Moliner Cabedo, Emma; Universitat Jaume I. Departament d'Enginyeria Mecànica i ConstruccióFecha de publicación
2020-01Editor
Universitat Jaume IResumen
The present work is intended to solve the problem of quenching cracks in Oil country
tubular goods (OCTG) seamless tubes of the group Vallourec, the world leader in premium
tubular solutions.
The production process ... [+]
The present work is intended to solve the problem of quenching cracks in Oil country
tubular goods (OCTG) seamless tubes of the group Vallourec, the world leader in premium
tubular solutions.
The production process of an OCTG seamless tube is composed of several steps: the
heating of the billet, a full cylinder, the hot piercing, the hot rolling, the heat treatment and
the finishing. Each process has an associated defectology which may carry problems in the
subsequent steps. The most recurrent defect associated with the heat treatment are
quenching cracks. The heat treatment is split into two phases: quenching (cooling) which is
often followed by a tempering (reheating). Quenching cracks are cracks which may appear
in some alloyed steel due to the great thermal stress amplified by the presence of previous
defects or microflaws. The presence of quenching cracks involves the discarding of the tube
and it may cause an income descent if an entire batch is not eligible to be sent to a
customer.
To overcome this production problem, the Group is developing a quenching model
allowing the real-time prediction of the evolution of temperature within the tube. It is
important to note that in this type of industry the non-stop of the production is a major
constraint to be respected. Therefore the model must give accurate results in very few
seconds allowing the operator a considerable timeframe to react and modify the eventual
problems. The current quenching model solves the heat equation by using the Euler explicit
finite-differences method and provides very worthy information to track the thermal
evolution of the tube when it is submitted to quench: the cooling curves. Thanks to the
quenching model all tubes can be tracked and submitted to thermal analysis.
In spite of that, the quenching model still needs to be completed with mechanical features
allowing to predict certain critical thermal stresses which can damage the tubes. This report
will focus on the model of the thermomechanical behavior of steel. Great thermal stresses,
issue of the brutal cooldown, are at the origin of quenching cracks so they must be
computed and analyzed. Moreover, to evaluate the conformity of the tube, some cracking
criteria need to be implemented in the model. These criteria will allow the operator to
discern whether the tube is going to follow the standards of quality or not and do the
pertinent modifications. [-]
Palabras clave / Materias
Descripción
Treball Final de Grau en Enginyeria en Tecnologies Industrials. Codi: ET1040. Curs acadèmic: 2019/2020
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