1525
Another essential part of WAAM processing for most materials is post-process treatment , which is used to reduce residual stresses and distortion , refine microstructures , improve microhardness and enhance material strength .
 manufacturing process: WAAM; concept or principle: materials; concept or principle: post-process; machanical property: residual stresses; concept or principle: distortion; material: microstructures; concept or principle: microhardness; machanical property: material strength
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:
 manufacturing process: WAAM; concept or principle: materials; concept or principle: post-process; machanical property: residual stresses; concept or principle: distortion; material: microstructures; concept or principle: microhardness; machanical property: material strength