Fabio Bassan | Università degli Studi di Padova (original) (raw)
Papers by Fabio Bassan
ABSTRACT In the present work, the effects of different microstructural features on the mechanical... more ABSTRACT In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α/β eutectic in the semi-solid castings tend to increase the mechanical properties.
The possibility to produce stainless steel components at limited cost and characterized by elevat... more The possibility to produce stainless steel components at limited cost and characterized by elevated mechanical properties, has gained more importance in the last years. Nowadays, the cold and warm forging processes of carbon steels are widely used to form industrial parts due to their economic advantages, but there is still lack of extensive research on industrial process design and evaluation of the microstructural properties of cold-warm forged stainless steel parts. In the last few decades, the environment concerning the recent forging industry has been rapidly changed. Now, near-net-shape or net-shape manufacturing processes are becoming a useful practice in metal forming, resulting in saving material and energy. Many parts produced with machining can be manufactured at lower cost by cold and warm forging. Traditionally, forging design is carried out using mainly empirical guidelines, experience, and trial-and-error, which results in a long process development time and high prod...
Materials (Basel, Switzerland), Jan 18, 2017
Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning... more Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning Electron Microscopy (FEG-ESEM) has been used to evaluate the microstructural and local plastic strain evolution in different alloys (AISI 1005, AISI 304L and Duplex 2205) deformed by a single-stage cold and warm forging process. The present work is aimed to describe the different behavior of the austenite and ferrite during plastic deformation as a function of different forging temperatures. Several topological EBSD maps have been measured on the deformed and undeformed states. Then, image quality factor, distributions of the grain size and misorientation have been analyzed in detail. In the austenitic stainless steel, the γ-phase has been found to harden more easily, then α-phase and γ-phase in AISI 1005 and in duplex stainless steel, sequentially. Compared to the high fraction of continuous dynamic recrystallized austenitic zones observed in stainless steels samples forged at low temp...
Materials Science Forum, Jul 1, 2013
ABSTRACT In the present work, the effects of different microstructural features on the mechanical... more ABSTRACT In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α/β eutectic in the semi-solid castings tend to increase the mechanical properties.
Key Engineering Materials, Oct 15, 2014
In the present work, the effects of different microstructural features on the mechanical properti... more In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α...
Key Engineering Materials, 2014
Materials Science Forum, 2013
ABSTRACT In the present work, the effects of different microstructural features on the mechanical... more ABSTRACT In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α/β eutectic in the semi-solid castings tend to increase the mechanical properties.
The possibility to produce stainless steel components at limited cost and characterized by elevat... more The possibility to produce stainless steel components at limited cost and characterized by elevated mechanical properties, has gained more importance in the last years. Nowadays, the cold and warm forging processes of carbon steels are widely used to form industrial parts due to their economic advantages, but there is still lack of extensive research on industrial process design and evaluation of the microstructural properties of cold-warm forged stainless steel parts. In the last few decades, the environment concerning the recent forging industry has been rapidly changed. Now, near-net-shape or net-shape manufacturing processes are becoming a useful practice in metal forming, resulting in saving material and energy. Many parts produced with machining can be manufactured at lower cost by cold and warm forging. Traditionally, forging design is carried out using mainly empirical guidelines, experience, and trial-and-error, which results in a long process development time and high prod...
Materials (Basel, Switzerland), Jan 18, 2017
Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning... more Electron BackScatter Diffraction (EBSD) in conjunction with Field-Emission Environmental Scanning Electron Microscopy (FEG-ESEM) has been used to evaluate the microstructural and local plastic strain evolution in different alloys (AISI 1005, AISI 304L and Duplex 2205) deformed by a single-stage cold and warm forging process. The present work is aimed to describe the different behavior of the austenite and ferrite during plastic deformation as a function of different forging temperatures. Several topological EBSD maps have been measured on the deformed and undeformed states. Then, image quality factor, distributions of the grain size and misorientation have been analyzed in detail. In the austenitic stainless steel, the γ-phase has been found to harden more easily, then α-phase and γ-phase in AISI 1005 and in duplex stainless steel, sequentially. Compared to the high fraction of continuous dynamic recrystallized austenitic zones observed in stainless steels samples forged at low temp...
Materials Science Forum, Jul 1, 2013
ABSTRACT In the present work, the effects of different microstructural features on the mechanical... more ABSTRACT In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α/β eutectic in the semi-solid castings tend to increase the mechanical properties.
Key Engineering Materials, Oct 15, 2014
In the present work, the effects of different microstructural features on the mechanical properti... more In the present work, the effects of different microstructural features on the mechanical properties of a traditional and semi-solid gravity sand cast AM60B alloy are investigated. The Rapid Slurry Forming (RSFTM) technology and a step casting geometry, with a range of thickness from 5 to 20 mm, have been used. The results show that the microstructure of traditionally gravity cast step castings consist of primary α-Mg dendrites, while those cast at semi-solid state show the presence of quasi-globular α-Mg phase. Partially divorced α-Mg/β-Mg17Al12 eutectic and fine intermetallic Al-Mn compounds, distributed among the interdendritic regions and along grain boundaries, are also revealed. Due to low solidification rate, discontinuous precipitations of Mg17Al12 into α-Mg grains take also place. The few micrometers size range of α-Mg grains, and the blocky morphology of α/β eutectic and Al-Mn compounds increase the mechanical properties of semi-solid alloy. Furthermore, lower fraction of α...
Key Engineering Materials, 2014
Materials Science Forum, 2013