Microstructure, defects and mechanical behavior of beta-type titanium porous structures manufactured by electron beam melting and selective laser melting

摘要: Abstract This study investigates the differences in microstructure, defects and mechanical behavior of porous structures from a β-type Ti 24Nb 4Zr 8Sn manufactured by electron beam melting (EBM) selective laser (SLM). The phases, size shape melt pool, volume distribution are analyzed correlated to compressive fatigue properties. Due different powder bed temperatures, microstructure EBM SLM samples consists α+β phases single β phase, respectively. faster cooling rate during promotes formation fine dendrites, which leads higher strength (50 ± 0.9 MPa) lower Young's Modulus (0.95 ± 0.05 GPa) comparison parts (45 ± 1.1 MPa 1.34 ± 0.04 GPa respectively). large present within solid strut likely result tin vaporization. vapor is more easily trapped process due smaller spot rate. results 10 times increase number defects. These have limited influence on both static properties low stresses level strength, but it causes reduced variable life at high level.