Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems
Research in aerospace applications includes the replacement of well-known materials by newly developed alloys or by new manufacturing methods for the existing materials. In the frame of TiB-Air project funded by the German Federal Ministry for Economic Affairs and Energy (BMWi) the development of a...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2020-01-01
|
| Series: | MATEC Web of Conferences |
| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_11027.pdf |
| _version_ | 1818883071858966528 |
|---|---|
| author | Riekehr Stefan Ventzke Volker Wagner Sabine Beck Werner Kashaev Nikolai |
| author_facet | Riekehr Stefan Ventzke Volker Wagner Sabine Beck Werner Kashaev Nikolai |
| author_sort | Riekehr Stefan |
| collection | DOAJ |
| description | Research in aerospace applications includes the replacement of well-known materials by newly developed alloys or by new manufacturing methods for the existing materials. In the frame of TiB-Air project funded by the German Federal Ministry for Economic Affairs and Energy (BMWi) the development of a process chain consisting of deep drawing at elevated temperatures, chemical milling, contour machining by laser cutting and laser beam welding to produce pneumatic T-ducts used in bleed air systems is in focus. This production process of sheet metal parts could lower costs in terms of the process itself and the used materials: low alloyed Ti-alloys. Commercially pure titanium alloy (cp-Ti) is commonly used for these structures because of its balanced mechanical properties regarding tensile strength, yield strength, plastic strain and fatigue strength as well as good resistance against corrosion and oxidation. The possibility to substitute cp-Ti by low-alloyed Ti-alloys is examined in this work, by the comparison of two different low alloyed Ti-alloys, namely KS1.2ASN and Ti XT, with a cp-Ti alloy (Grade 4). Mechanical properties of the base materials, their weldability and the mechanical assessment of the laser beam welded butt joints in terms of static, cyclic and fracture mechanical behaviour is compared for sheet materials, with a thickness of 0.9 mm. Defect-free welding according to EN13919 acceptance criteria B was possible for all three alloys, no porosity problems occurred. The low strength alloy KS1.2ASN exhibited mechanical anisotropy between longitudinal direction and transverse direction in the tensile test, welded specimens of this alloy broke in the base material. Due to the tensile properties, both weld and base material of KS1.2ASN showed the least values for the fatigue strength and endurance limit strength. Ti XT and Grade 4 showed similar mechanical anisotropy and fractured in the base material, too. Fatigue strength of Ti XT is below Grade 4, but for the 50%-percentile the endurance limit strength is equal. Fracture mechanical testing showed that KS1.2ASN is a very promising alloy in the welded condition. |
| first_indexed | 2024-12-19T15:27:50Z |
| format | Article |
| id | doaj.art-e9826ee5a890458287fd20ccced343ab |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-19T15:27:50Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-e9826ee5a890458287fd20ccced343ab2022-12-21T20:15:50ZengEDP SciencesMATEC Web of Conferences2261-236X2020-01-013211102710.1051/matecconf/202032111027matecconf_ti2019_11027Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systemsRiekehr Stefan0Ventzke Volker1Wagner Sabine2Beck Werner3Kashaev Nikolai4Institute of Materials Research, Materials Mechanics, Joining and Assessment Department, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1Institute of Materials Research, Materials Mechanics, Joining and Assessment Department, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1FormTech GmbHFormTech GmbHInstitute of Materials Research, Materials Mechanics, Joining and Assessment Department, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1Research in aerospace applications includes the replacement of well-known materials by newly developed alloys or by new manufacturing methods for the existing materials. In the frame of TiB-Air project funded by the German Federal Ministry for Economic Affairs and Energy (BMWi) the development of a process chain consisting of deep drawing at elevated temperatures, chemical milling, contour machining by laser cutting and laser beam welding to produce pneumatic T-ducts used in bleed air systems is in focus. This production process of sheet metal parts could lower costs in terms of the process itself and the used materials: low alloyed Ti-alloys. Commercially pure titanium alloy (cp-Ti) is commonly used for these structures because of its balanced mechanical properties regarding tensile strength, yield strength, plastic strain and fatigue strength as well as good resistance against corrosion and oxidation. The possibility to substitute cp-Ti by low-alloyed Ti-alloys is examined in this work, by the comparison of two different low alloyed Ti-alloys, namely KS1.2ASN and Ti XT, with a cp-Ti alloy (Grade 4). Mechanical properties of the base materials, their weldability and the mechanical assessment of the laser beam welded butt joints in terms of static, cyclic and fracture mechanical behaviour is compared for sheet materials, with a thickness of 0.9 mm. Defect-free welding according to EN13919 acceptance criteria B was possible for all three alloys, no porosity problems occurred. The low strength alloy KS1.2ASN exhibited mechanical anisotropy between longitudinal direction and transverse direction in the tensile test, welded specimens of this alloy broke in the base material. Due to the tensile properties, both weld and base material of KS1.2ASN showed the least values for the fatigue strength and endurance limit strength. Ti XT and Grade 4 showed similar mechanical anisotropy and fractured in the base material, too. Fatigue strength of Ti XT is below Grade 4, but for the 50%-percentile the endurance limit strength is equal. Fracture mechanical testing showed that KS1.2ASN is a very promising alloy in the welded condition.https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_11027.pdf |
| spellingShingle | Riekehr Stefan Ventzke Volker Wagner Sabine Beck Werner Kashaev Nikolai Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems MATEC Web of Conferences |
| title | Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems |
| title_full | Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems |
| title_fullStr | Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems |
| title_full_unstemmed | Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems |
| title_short | Comparison of different titanium alloys welded by Yb:YAG fibre laser for thin sheet applications used for T-ducts in bleed air systems |
| title_sort | comparison of different titanium alloys welded by yb yag fibre laser for thin sheet applications used for t ducts in bleed air systems |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2020/17/matecconf_ti2019_11027.pdf |
| work_keys_str_mv | AT riekehrstefan comparisonofdifferenttitaniumalloysweldedbyybyagfibrelaserforthinsheetapplicationsusedfortductsinbleedairsystems AT ventzkevolker comparisonofdifferenttitaniumalloysweldedbyybyagfibrelaserforthinsheetapplicationsusedfortductsinbleedairsystems AT wagnersabine comparisonofdifferenttitaniumalloysweldedbyybyagfibrelaserforthinsheetapplicationsusedfortductsinbleedairsystems AT beckwerner comparisonofdifferenttitaniumalloysweldedbyybyagfibrelaserforthinsheetapplicationsusedfortductsinbleedairsystems AT kashaevnikolai comparisonofdifferenttitaniumalloysweldedbyybyagfibrelaserforthinsheetapplicationsusedfortductsinbleedairsystems |