1469
5.1 Post-process heat treatment Post-process heat treatment is widely used in WAAM to reduce residual stress , enhance material strength and as a method of hardness control .
 concept or principle: Post-process heat; concept or principle: Post-process heat; manufacturing process: WAAM; machanical property: residual stress; machanical property: material strength; material: as; machanical property: hardness
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: Post-process heat; concept or principle: Post-process heat; manufacturing process: WAAM; machanical property: residual stress; machanical property: material strength; material: as; machanical property: hardness