2593
SEM analysis showed a fine ( 500–800 nm ) interconnected sub-granular structure for the AM 316L SS , but a polygonal coarse-grained structure for the wrought sample .
 SEM, structure, AM, SS, structure, wrought sample
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:
 SEM, structure, AM, SS, structure, wrought sample