TC18钛合金电子束熔丝成形送丝工艺与显微组织性能

Microstructure and Tensile Properties of TC18 Alloys by Electron Beam Rapid Manufacturing

利用电子束熔丝成形(EBRM)技术制备了TC18钛合金试样,研究了相同热处理工艺条件下,不同送丝方式对电子束熔丝成形TC18钛合金组织与性能的影响。结果表明:电子束熔丝成形件经热处理后,2种工艺对应的宏观组织均为异常粗大的β柱状晶,但是单丝工艺晶粒尺寸较双丝工艺细小;2种工艺成形后显微组织均为片状初生α相、β转变组织及晶界α相,单丝片状初生α相含量多于双丝,且片间距小于双丝;单丝工艺对应的塑性及稳定性均高于双丝,强度略低于双丝。

The samples of TC18 titanium alloy were prepared by electron beam rapid manufacturing（EBRM）. The effect of different wire feeding modes, single wire and double wire, on microstructure and tensile properties of the TC18 alloy by EBRM were studied. The typical macrostructure of the TC18 alloy exhibits large columnar β grains nucleated at the substrate after EBRM, and the size of single wire is finer than that of double wire. However, both processes cause flake primary α phase, β transformation microstructure and grain boundary α phase. The amount of primary α phase of single wire is larger than that of double wire, and the interlamellar spacing of single wire is smaller than that of double wire. The plasticity and stability of single wire are higher, while its strength is slightly lower than that of the double wire.