4123
Annealing , solution heat treatment ( SHT ) and T6 heat treatment ( T6 HT ) were applied under different processing conditions .
 Annealing, solution heat treatment, heat treatment
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:
 Annealing, solution heat treatment, heat treatment