Ti-based alloys have been widely applied in the aerospace field,owing to their outstanding performance.Precision casting can be used to make integrated near-net-shape components with complex thin-walled structures,whi...Ti-based alloys have been widely applied in the aerospace field,owing to their outstanding performance.Precision casting can be used to make integrated near-net-shape components with complex thin-walled structures,which will further promote the engineering application of Ti-based alloys. In this paper,the research progress of Tibased alloys,e. g.,high-temperature Ti-based alloys,high-strength Ti-based alloys,TiAl-based alloys,Ti-based matrix composites,and their precision casting technologies are reviewed. In addition,the development directions of Tibased alloys are presented based on the application status of Ti-based alloys in the aerospace field.展开更多
Aer Met100 steel thick wall is fabricated by in-situ rolling composite wire arc additive manufacturing(WAAM).The microstructure and mechanical properties of Aer Met100 steel after heat treatment are studied.The result...Aer Met100 steel thick wall is fabricated by in-situ rolling composite wire arc additive manufacturing(WAAM).The microstructure and mechanical properties of Aer Met100 steel after heat treatment are studied.The results show that after the introduction of in-situ rolling force,the grain of Aer Met100 steel is broken,the anisotropy is eliminated,and the microstructure is refined obviously.The microstructure of Aer Met100 steel after heat treatment is mainly lath martensite and reverse austenite.There are 40 nm-68.6 nm alloy carbides precipitated in the martensitic matrix,and the hardening mechanism is mainly Orowan bypass strengthening.The film-like reverse austenite with the thickness ranging from 2 nm to 5 nm exists between the martensitic lath,which improves the toughness of the maraging steel.Good combination of strength and toughness can be achieved through proper heat treatment process.展开更多
文摘Ti-based alloys have been widely applied in the aerospace field,owing to their outstanding performance.Precision casting can be used to make integrated near-net-shape components with complex thin-walled structures,which will further promote the engineering application of Ti-based alloys. In this paper,the research progress of Tibased alloys,e. g.,high-temperature Ti-based alloys,high-strength Ti-based alloys,TiAl-based alloys,Ti-based matrix composites,and their precision casting technologies are reviewed. In addition,the development directions of Tibased alloys are presented based on the application status of Ti-based alloys in the aerospace field.
文摘Aer Met100 steel thick wall is fabricated by in-situ rolling composite wire arc additive manufacturing(WAAM).The microstructure and mechanical properties of Aer Met100 steel after heat treatment are studied.The results show that after the introduction of in-situ rolling force,the grain of Aer Met100 steel is broken,the anisotropy is eliminated,and the microstructure is refined obviously.The microstructure of Aer Met100 steel after heat treatment is mainly lath martensite and reverse austenite.There are 40 nm-68.6 nm alloy carbides precipitated in the martensitic matrix,and the hardening mechanism is mainly Orowan bypass strengthening.The film-like reverse austenite with the thickness ranging from 2 nm to 5 nm exists between the martensitic lath,which improves the toughness of the maraging steel.Good combination of strength and toughness can be achieved through proper heat treatment process.
