4507
As a consequence of thermal accumulation and in-situ heat treating during the DED process , aB-deposited samples present a graded microstructure along the building direction along with a phase transition from hcp-α Ti to bbc-β Ti .
 As, in-situ heat, DED, samples, graded microstructure, building direction, phase, Ti, Ti
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 As, in-situ heat, DED, samples, graded microstructure, building direction, phase, Ti, Ti