2595
A higher pitting resistance ( extended passive region ) and improved stability of the AM 316L SS was attributed to its dense structure of oxide film and refined microstructure .
 pitting, stability, AM, SS, structure, oxide, microstructure
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:
 pitting, stability, AM, SS, structure, oxide, microstructure