Effect of annealing process on mechanical properties and microstructure of additive manufactured TC18 titanium alloy

doi:10.13251/j.issn.0254-6051.2020.08.027

Abstract

Abstract: Effect of annealing parameters on mechanical properties and microstructure of TC18 titanium alloy was studied by means of microstructure observation and mechanical properties test. The results show that the tested block of TC18 titanium alloy made by additive manufacturing has no cracks observed, and possesses flat, smooth and uniformly silver-white surface. The mechanical properties of specimens annealed at 600 ℃ for 2 h are both satisfied with standard requirement of the GJB 2744A—2007, and its R_p0.2, R_m, A and Z are 1036 MPa, 1084 MPa, 9.8% and 30%, respectively. The microstructure of TC18 titanium alloy made by additive manufacturing is the typical structure of columnar crystal, and in the coarse columnar grains of β phase, there is elongated needle-like α phase and fine woven α+β lath structure. With the increase of annealing temperature, the needle-like α phase in the columnar grain is coarsened gradually.

Key words: annealing, additive manufacturing, TC18 titanium alloy, mechanical properties, microstructure

CLC Number:

TG156

Chen Suming, Hu Shengshuang, Zhang Ying, Zheng Chao, Wang Xiaoguang, Gao Tingting. Effect of annealing process on mechanical properties and microstructure of additive manufactured TC18 titanium alloy[J]. Heat Treatment of Metals, 2020, 45(8): 142-146.

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