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In the cold metal transfer additive manufacturing process of Ti-6Al-4V thin wall structure , ultrasonic peening treatment ( UPT ) in three directions is proposed to refine the large columnar prior-β grains and secondary α grains , and to improve anisotropy in tensile properties .
 manufacturing process: cold metal transfer additive manufacturing; material: Ti-6Al-4V; concept or principle: structure; manufacturing process: ultrasonic peening; concept or principle: grains; concept or principle: grains; machanical property: anisotropy; machanical property: tensile properties
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:
 manufacturing process: cold metal transfer additive manufacturing; material: Ti-6Al-4V; concept or principle: structure; manufacturing process: ultrasonic peening; concept or principle: grains; concept or principle: grains; machanical property: anisotropy; machanical property: tensile properties