6681
The impact toughness of the aB-deposited DED 300M ultra-high strength steel is 9 J/cm2 , while it is significantly increased to 25 J/cm2 after heat treatment .
 concept or principle: impact; manufacturing process: DED; machanical property: strength; material: steel; manufacturing process: heat treatment
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: impact, DED, strength, steel, heat treatment 
Answer:
 concept or principle: impact; manufacturing process: DED; machanical property: strength; material: steel; manufacturing process: heat treatment