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In this work , laser shock peening ( LSP ) is used as a post-treatment method to change the surface characteristics of selective laser melted ( SLM ) nano-TiC particle-reinforced Inconel 625 nanocomposites ( TiC/IN625 ) .
 laser, peening, as, post-treatment, surface, selective laser melted, SLM, Inconel 625
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:
 laser, peening, as, post-treatment, surface, selective laser melted, SLM, Inconel 625