6678
The results show that the microstructure of the aB-deposited DED 300M ultra-high strength steel is mainly composed of martensite and some blocky bainite .
 concept or principle: microstructure; manufacturing process: DED; machanical property: strength; material: steel; material: martensite; material: bainite
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: microstructure, DED, strength, steel, martensite, bainite 
Answer:
 concept or principle: microstructure; manufacturing process: DED; machanical property: strength; material: steel; material: martensite; material: bainite