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studied the deformation mechanism of 17-4 precipitated hardened stainless steel fabricated by direct metal laser sintering using micro pillar compression testing and transmission electron microscopy .
 concept or principle: deformation; machanical property: precipitated hardened; material: steel; concept or principle: fabricated; manufacturing process: direct metal laser sintering; process characterization: micro pillar compression testing; process characterization: transmission electron microscopy
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: deformation; machanical property: precipitated hardened; material: steel; concept or principle: fabricated; manufacturing process: direct metal laser sintering; process characterization: micro pillar compression testing; process characterization: transmission electron microscopy