6953
The transient temperature and velocity fields during single-track and multi-track laser PBF were computed considering the melting and solidification of the powder feedstocks .
 transient, temperature, laser, melting, solidification, powder feedstocks
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:
 transient, temperature, laser, melting, solidification, powder feedstocks