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The microstructure of LPBF solid samples and their mechanical properties , fracture and fatigue behavior have some peculiarities in aB-built and heat-treated AM parts , which have been widely studied .
 concept or principle: microstructure; manufacturing process: LPBF; concept or principle: samples; concept or principle: mechanical properties; concept or principle: fracture; machanical property: fatigue; manufacturing process: heat-treated; machine or equipment: AM parts
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: microstructure; manufacturing process: LPBF; concept or principle: samples; concept or principle: mechanical properties; concept or principle: fracture; machanical property: fatigue; manufacturing process: heat-treated; machine or equipment: AM parts