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Directed energy deposition ( DED ) of two high-carbon high speed steel alloys Febal-C-Cr-Mo-V and Febal−x-C-Cr-Mo-V-Wx was performed by using a 4 kW Nd : YAG laser source .
 Directed energy deposition, DED, high speed steel alloys, Febal-C-Cr-Mo-V, Nd : YAG, laser source
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 Directed energy deposition, DED, high speed steel alloys, Febal-C-Cr-Mo-V, Nd : YAG, laser source