Podium NIDAS

Duración (en horas): Más de 50 horas - Destinatario: ProfesorEl equipo de estudiantes debe realizar una selección de los materiales que precisa para construir un podium de entrega de trofeos. El diseño del podium es libre, siempre que cumpla los requisitos que les propone el escenario del proyecto. La selección de materiales se justificar en el contexto de la naturaleza del material, el proceso de fabricación de cada pieza y las soluciones que se proponen para realizar las uniones entre piezas

Students’ Perception about Sustainability in the Engineering School of Bilbao (University of the Basque Country): Insertion Level and Importance

Almost three decades have passed since the Rio declaration, and after numerous initiatives developed to include sustainability in higher education, with the support of Education for Sustainable Development, it is worth wondering at what point is the process of inserting sustainability in university degrees. To clarify this question, engineering students were inquired, at the University of the Basque Country (UPV/EHU), about their perception of the insertion-level of sustainability and the importance they give to it (in environmental, social, and economic dimensions). The novelty of this study lies in the use of a new questionnaire, based on the students’ activity. The instrument was designed ad hoc and was previously validated for this study. The results indicate a low insertion level of sustainability in its three dimensions in three engineering degrees analysed. Nevertheless, the research also shows that the students give great importance to Sustainable Development (SD), either in academic, personal, or professional spheres. The low insertion level of SD and the high interest of students should be considered by the academic institution as an opportunity to deep in its holistic approach to promote the integration of SD in university curricula, not only in engineering degrees.This work has been carried out within the educational innovation project PIE 135/2019-2020, subsidized by the vice-chancellor’s office for innovation, social commitment, and cultural action of UPV/EHU

Optimizing Laser Powder Bed Fusion Parameters for IN-738LC by Response Surface Method

A method to find the optimum process parameters for manufacturing nickel-based superalloy Inconel 738LC by laser powder bed fusion (LPBF) technology is presented. This material is known to form cracks during its processing by LPBF technology; thus, process parameters have to be optimized to get a high quality product. In this work, the objective of the optimization was to obtain samples with fewer pores and cracks. A design of experiments (DoE) technique was implemented to define the reduced set of samples. Each sample was manufactured by LPBF with a specific combination of laser power, laser scan speed, hatch distance and scan strategy parameters. Using the porosity and crack density results obtained from the DoE samples, quadratic models were fitted, which allowed identifying the optimal working point by applying the response surface method (RSM). Finally, five samples with the predicted optimal processing parameters were fabricated. The examination of these samples showed that it was possible to manufacture IN738LC samples free of cracks and with a porosity percentage below 0.1%. Therefore, it was demonstrated that RSM is suitable for obtaining optimum process parameters for IN738LC alloy manufacturing by LPBF technology.This research was funded by Elkartek programme, grant number KK-2018/00115, which is part of the Economic Development Department of the Basque Country Government

Evolution of Microstructure during Isothermal Treatments of a Duplex-Austenitic 0.66C11.4Mn.9.9Al Low-Density Forging Steel and Effect on the Mechanical Properties

In the last decades, low-density steels for forging have increasing interest in the automotive industry, and good mechanical properties are required for their real application. This paper describes the results obtained for a 0.66C11.4Mn9.9Al duplex austenitic low-density steel after applying a set of isothermal treatments at different combinations of time and temperature, aimed to promote kappa carbide precipitation, and improve the mechanical properties obtained with a water quenching treatment. The effects of the different isothermal treatments on the microstructure and on the mechanical properties have been analyzed and compared to those obtained from a quenching heat treatment. We found that isothermal treatments in the range temperature between 550–750 °C promoted the profuse precipitation of coarse kappa carbides at grain boundaries, which dramatically reduced the ductility of the alloy, whereas a traditional quenching treatment resulted in a better combination of ductility and mechanical strength.This research has been carried out with a financial grant of the Basque Government under its ELKARTEK Research Program, KK-2016/00029-ABADE project and KK-2018/00016-COFADEN project

Influence of Minor Alloying Element Additions on the Crack Susceptibility of a Nickel Based Superalloy Manufactured by LPBF

Inconel 738LC (IN738LC) is a nickel-based superalloy specially used in the hot section components of turbine engines. One of its main drawbacks relies on the cracking susceptibility when it is manufactured by laser powder bed fusion (LPBF). This paper analyzes the influence of minor alloying element concentration on cracking tendency of IN738LC superalloy manufactured by LPBF. For that objective, samples were manufactured using two powders, which presented different minor alloying elements concentration (Si, Zr and B). It was shown that the samples crack tendency was very different depending on the powder used for their manufacturing. In fact, the measured crack density value was 2.73 mm/mm2 for the samples manufactured with the powder with higher minor alloying elements concentration, while 0.25 mm/mm2 for the others. Additionally, a special emphasis has been put on elemental composition characterization in cracked grain boundaries in order to quantify possible Si or Zr enrichment. It has been also studied the differences of solidification ranges and grain structures between both samples as a consequence of different minor alloying elements concentration in order to analyze their effect on crack susceptibility. In this sense, Scheil-Gulliver simulation results have shown that samples with higher Si and Zr contents presented higher solidification range temperature. This fact, as well as an increase of the presence of high angle grain boundaries (HAGB), leaded to an increment in the crack formation during solidification. Therefore, in this research work, an understanding of the factors affecting crack phenomenon in the LPBF manufactured IN738LC was accomplished.This research was funded by the Elkartek Programme, Grant Number KK-2020/00042

X-ray Thermo-Diffraction Study of the Aluminum-Based Multicomponent Alloy Al58Zn28Si8Mg6

Newly designed multicomponent light alloys are giving rise to non-conventional microstructures that need to be thoroughly studied before determining their potential applications. In this study, the novel Al58Zn28Si8Mg6 alloy, previously studied with CALPHAD methods, was cast and heat-treated under several conditions. An analysis of the phase evolution was carried out with in situ X-ray diffraction supported by differential scanning calorimetry and electron microscopy. A total of eight phases were identified in the alloy in the temperature range from 30 to 380 °C: α-Al, α’-Al, Zn, Si, Mg2Si, MgZn2, Mg2Zn11, and SrZn13. Several thermal transitions below 360 °C were determined, and the natural precipitation of the Zn phase was confirmed after nine months. The study showed that the thermal history can strongly affect the presence of the MgZn2 and Mg2Zn11 phases. The combination of X-ray thermo-diffraction with CALPHAD methods, differential scanning calorimetry, and electron microscopy offered us a satisfactory understanding of the alloy behavior at different temperatures.This research was funded by the BASQUE GOVERNMENT through the Elkartek project KK-2020/00047

Compound Formation And Microstructure Of As-Cast High Entropy Aluminums

The aim of this work is to study the microstructure of four high entropy alloys (HEAs) produced by large scale vacuum die casting. Al40Cu15Mn5Ni5Si20Zn15, Al45Cu15Mn5Fe5Si5Ti5Zn20, Al35Cu5Fe5Mn5Si30V10Zr10, and Al50Ca5Cu5Ni10Si20Ti10 alloys formed amixture of different structures, containing intermetallic compound (IC) and solid solution (SS) phases. The phases observed in the casting alloys were compared with the equilibrium phases predicted by Thermo-Calc. The measured densities varied from 3.33 g/cm(-3) to 5.07 g/cm(-3) and microhardness from 437 Hv to 887 Hv. Thus, the microhardness and estimated strength/density ratios are significantly higher than other lightweight high entropy alloys (LWHEAs).This work has been partially funded by the Basque Government through the project Elkartek: KK-2017/00007

Podium NIDAS

Duración (en horas): Más de 50 horas - Destinatario: ProfesorEl equipo de estudiantes debe realizar una selección de los materiales que precisa para construir un podium de entrega de trofeos. El diseño del podium es libre, siempre que cumpla los requisitos que les propone el escenario del proyecto. La selección de materiales se justificar en el contexto de la naturaleza del material, el proceso de fabricación de cada pieza y las soluciones que se proponen para realizar las uniones entre piezas

1st International Conference on Engineering Education for the XXI Century – New competences on Engineering Education in the area of sustainability and university social responsibility

174 p.The conference is co-organised by the Jaume I University in Castellón (UJI) and the University of the Basque Country (UPV-EHU) and is intended as a forum for the exchange of ideas, opinions and experiences and debate on the subject of engineering education and ways in which it can be adapted to the new university paradigm. The aim is to discuss the need to incorporate new transverse competences associated with sustainability and university social responsibility into the engineering curriculum. The conference is interested in works on education in engineering, particularly those implementing aspects of social responsibility and sustainability in undergraduate and postgraduate engineering studies. Communications are related to the creation of theoretical frameworks, application of new methodologies in the classroom, presentation of teaching experiences or any other activities related to engineering education. The conference includes five main sessions: a) Service-Learning and social commitment in engineering. b) Engineering and gender. c) Engineering and development co-operation. d) Environmental sustainability. e) Corporate and business social responsibility. The present book is the compilation of the abstracts submitted by the conference delegates as delivered

1st International Conference on Engineering Education for the XXI Century – New competences on Engineering Education in the area of sustainability and university social responsibility

174 p.The conference is co-organised by the Jaume I University in Castellón (UJI) and the University of the Basque Country (UPV-EHU) and is intended as a forum for the exchange of ideas, opinions and experiences and debate on the subject of engineering education and ways in which it can be adapted to the new university paradigm. The aim is to discuss the need to incorporate new transverse competences associated with sustainability and university social responsibility into the engineering curriculum. The conference is interested in works on education in engineering, particularly those implementing aspects of social responsibility and sustainability in undergraduate and postgraduate engineering studies. Communications are related to the creation of theoretical frameworks, application of new methodologies in the classroom, presentation of teaching experiences or any other activities related to engineering education. The conference includes five main sessions: a) Service-Learning and social commitment in engineering. b) Engineering and gender. c) Engineering and development co-operation. d) Environmental sustainability. e) Corporate and business social responsibility. The present book is the compilation of the abstracts submitted by the conference delegates as delivered