Effect of Heat Treatment on Mechanical Properties and Wear Resistance of Selective Laser Melting Ti6Al4V Alloy
The effects of heat treatment on the microstructure,mechanical properties and wear resistance of Ti6Al4V alloy melted by selective laser melting were systematically studied.The results show that the structure of as-built sample is mainly composed of acicular α'martensite.After solution treatment,the acicular α'martensite decomposes,which leads to the decrease of the hardness of Ti6Al4V alloy.When the solution temperature is 800℃,the alloy forms an α'/α structure,which increases the tensile strength and elongation of the alloy by 12%and 23%,respectively.When the solution temperature reaches above 900℃,the mechanical properties of the alloy decrease sharply due to the disappearance of the α'/α structure,the grain coarsing of α phase and the increase of the content of β phase.The tensile strength decreases from(935±10)MPa to(815±9)MPa,and the elongation decreases from(8.72±0.2)%to(3.09±0.1)%.With the increase of solution temperature,the friction coefficient and wear rate increase linearly,which is completely opposite to the changing trend of hardness,and the wear mechanism is changed from single abrasive wear to abrasive wear and oxidative wear.
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