4613
The post-treatments investigated were hot isostatic pressing ( HIP ) and combined HIP + heat treatment ( HIP + HT ) carried out as a single cycle inside the HIP vessel .
 hot isostatic pressing, HIP, HIP, heat treatment, HIP, as, HIP
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:
 hot isostatic pressing, HIP, HIP, heat treatment, HIP, as, HIP