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The results show that due to the influences of thermal accumulation , the layer ’ s surface oxidation , microstructural evolution , grain size , and crystalline phase vary along the building direction of the aB-fabricated wall , which creates variations in mechanical properties and fracture features .
 layer, s, oxidation, microstructural evolution, grain size, phase, building direction, variations, mechanical properties, fracture
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:
 layer, s, oxidation, microstructural evolution, grain size, phase, building direction, variations, mechanical properties, fracture