1923
Since melt pool boundaries may differ in corrosion resistance compared to the center of the meltpool , more melt pool boundaries imply different corrosion resistance of LPBF material .
 concept or principle: melt pool boundaries; concept or principle: corrosion resistance; process characterization: meltpool; concept or principle: melt pool boundaries; concept or principle: corrosion resistance; material: LPBF material
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: melt pool boundaries; concept or principle: corrosion resistance; process characterization: meltpool; concept or principle: melt pool boundaries; concept or principle: corrosion resistance; material: LPBF material