國立虎尾科技大學 |

Formability Extension of Aerospace Alloys for Tube Hydroforming Applications = = Amelioration de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Formability Extension of Aerospace Alloys for Tube Hydroforming Applications =/
其他題名:	Amelioration de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes.
其他題名:	de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes
作者:	Anderson, Melissa.
面頁冊數:	1 online resource (185 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369827002

Formability Extension of Aerospace Alloys for Tube Hydroforming Applications = = Amelioration de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes.
Anderson, Melissa.

Formability Extension of Aerospace Alloys for Tube Hydroforming Applications =Amelioration de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes.de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes - 1 online resource (185 pages)

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (D.Eng.)

Includes bibliographical references

Tube hydroforming (THF) is an innovative metal forming process using a pressurized fluid in a closed die to produce complex shapes from tubular starting material. This process has many advantages (weight reduction, reduced tooling and assembly costs, fewer numbers of operations, superior products quality) but remains unconventional in aeronautics because of the limited formability of aerospace alloys. The main objective of the research conducted during this thesis is to study a method for increasing the formability of two designated aerospace alloys by the use of a multi-step forming method that includes cycles of forming followed by intermediate heat treatment steps. An extensive literature review on existing methods to improve the formability of aerospace alloys as well as on the available softening heat treatments has allowed the implementation of an appropriate experimental procedure. This process consists of several sequences of forming followed by successive heat treatments until obtaining the final part. The insertion of intermediate steps of heat treatment as well as the combination "deformation + heat treatment" influences the mechanical and metallurgical behavior of the alloys. Thus, a complete characterization of the materials had to be conducted at each stage of the process. From a mechanical point of view, the effect of heat treatment and more generally the effect of the multi-step forming process itself on the mechanical properties and constitutive laws of the alloys have been studied in detail. At the metallurgical level, the influence of the process on the microstructural characteristics of the alloys such as grain size, phases in presence and texture has been analyzed. These two parallel studies have allowed to understand completely and in details the impact of metallurgical modifications induced by the multistep process on the macroscopic mechanical behavior and final properties of the part.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369827002Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Formability Extension of Aerospace Alloys for Tube Hydroforming Applications = = Amelioration de la formabilite d'alliages aeronautiques pour leur mise en forme par hydroformage de tubes.
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500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
500 $a Advisers: Philippe Bocher; Javad Gholipour Baradari.
502 $a Thesis (D.Eng.) $c Ecole de Technologie Superieure (Canada) $d 2016.
504 $a Includes bibliographical references
520 $a Tube hydroforming (THF) is an innovative metal forming process using a pressurized fluid in a closed die to produce complex shapes from tubular starting material. This process has many advantages (weight reduction, reduced tooling and assembly costs, fewer numbers of operations, superior products quality) but remains unconventional in aeronautics because of the limited formability of aerospace alloys. The main objective of the research conducted during this thesis is to study a method for increasing the formability of two designated aerospace alloys by the use of a multi-step forming method that includes cycles of forming followed by intermediate heat treatment steps. An extensive literature review on existing methods to improve the formability of aerospace alloys as well as on the available softening heat treatments has allowed the implementation of an appropriate experimental procedure. This process consists of several sequences of forming followed by successive heat treatments until obtaining the final part. The insertion of intermediate steps of heat treatment as well as the combination "deformation + heat treatment" influences the mechanical and metallurgical behavior of the alloys. Thus, a complete characterization of the materials had to be conducted at each stage of the process. From a mechanical point of view, the effect of heat treatment and more generally the effect of the multi-step forming process itself on the mechanical properties and constitutive laws of the alloys have been studied in detail. At the metallurgical level, the influence of the process on the microstructural characteristics of the alloys such as grain size, phases in presence and texture has been analyzed. These two parallel studies have allowed to understand completely and in details the impact of metallurgical modifications induced by the multistep process on the macroscopic mechanical behavior and final properties of the part.
520 $a L'hydroformage de tube est un procede novateur de mise en forme du metal qui utilise la pression d'un fluide, generalement de l'eau, dans une matrice fermee pour deformer plastiquement des pieces d'epaisseur faible et fabriquer ainsi des composants tubulaires de geometries complexes. Ce procede possede de nombreux avantages tels que la reduction du poids des pieces, la diminution des couts lies a l'outillage et l'assemblage, la reduction du nombre d'etapes de fabrication et l'excellent etat de surface des pieces hydroformees. Cependant, malgre tous ces atouts, l'hydroformage reste un procede marginal dans le domaine aerospatial a cause de plusieurs facteurs dont la formabilite limitee des alliages aeronautiques. L'objectif principal de la recherche conduite dans le cadre de cette these est d'etudier une methode pour augmenter la formabilite de deux alliages aeronautiques designes par l'utilisation d'un procede de mise en forme multi-etapes qui inclue des cycles de mise en forme suivis d'etapes de traitement thermique intermediaires. Une revue de litterature exhaustive sur les methodes existantes pour ameliorer la formabilite des materiaux vises ainsi que les traitements thermiques d'adoucissement disponibles a permis d'etablir une procedure experimentale appropriee. Ce procede comprend plusieurs sequences de mise en forme suivie de traitement thermique successives jusqu'a l'obtention de la piece finale. L'insertion d'etapes de traitements thermiques intermediaires ainsi que la combinaison " deformation + traitement thermique " influencent le comportement mecanique et metallurgique des alliages. De ce fait, une caracterisation complete des materiaux a ete conduite a chaque etape du procede. D'un point de vue mecanique, l'effet des traitements thermiques et plus generalement du procede multi-etapes sur les proprietes mecaniques et lois constitutives des alliages a ete etudie en detail. Au niveau metallurgique, l'influence du procede sur les caracteristiques microstructurales des alliages tels la taille de grains, les phases en presence et la texture a ete analysee. Ces deux etudes paralleles ont permis de comprendre de facon complete et detaillee l'impact des modifications metallurgiques induites par le procede multietapes sur le comportement mecanique macroscopique et les proprietes finales de la piece.
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538 $a Mode of access: World Wide Web
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