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Results showed that the aB-built condition formed a layered structure with alternating layers of δ-ferrite and martensite , which resulted in anisotropic engineering and true-stress , true-strain mechanical performance .
 concept or principle: layered structure; material: martensite; machanical property: anisotropic; application: mechanical
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: layered structure; material: martensite; machanical property: anisotropic; application: mechanical