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The influence of build platform preheating ( 200 °C–800 °C ) , laser speed ( 550 mm/s - 950 mm/s ) and scan strategy ( bidirectional continuous and Mark & Sleep ( M & S ) ) on grain size , grain morphology , size of solidification cells , dislocation density , and texture was studied .
 build platform, laser, M & S, grain size, grain, solidification, cells, dislocation density, texture
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:
 build platform, laser, M & S, grain size, grain, solidification, cells, dislocation density, texture