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However , as the interpass temperature was increased from 100 °C to 400 °C , a decrease of α2 phase fraction was observed due to the lower cooling rate .
 as, interpass temperature, phase fraction, cooling rate
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, interpass temperature, phase fraction, cooling rate