Anisotropy of Microstructure and Mechanical Properties of Ti-15Mo Alloy Prepared by Selective Laser Melting
Ti-15Mo alloys were prepared by laser selective melting(SLM)technique in different building directions(0°,30°,45°,60°,90° form horizontal direction)and the anisotropy of microstructure and mechanical properties were studied.The results show that the texture orientation change was(001)→(101)→(111)when the building direction changed from 0° to 90°.The volume fraction of grain boundaries at low angles of 2°-10° in the alloys in 0° and 90° building directions was low.The average grain sizes of the alloys in the building directions of 0°,30°,45°,60° and 90° were 59.95,33.47,99.98,42.63,72.41 μm,respectively,and the average microhardnesses were 313.92,327.29,294.11,327.48,311.67 HV,respectively.The tensile strengths of the alloys in the building directions of 0°,45°,60°,90° were 866.35,898.78,1 055.97,913.70 MPa,and the yield strengths were 716.40,767.98,1 027.45,808.83 MPa,and the percentage elongations after fracture were 14.00％,18.97％,12.51％and 14.29％,respectively.The mechanical properties of SLM alloys in different building directions were anisotropic.
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