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Martensite content increased gradually from the 5th layer to the 25th layers , indicating that metastable martensite partly decomposed into stable ferrite due to the carbon atoms diffusion .
 material: Martensite; process parameter: layer; machanical property: metastable; material: martensite; material: ferrite; material: carbon atoms
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:
 material: Martensite; process parameter: layer; machanical property: metastable; material: martensite; material: ferrite; material: carbon atoms