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However , the fabrication of crack-free high-performance Ni-based superalloys such as Hastelloy X ( HX ) using LPBF technology remains a challenge because of these materials ’ susceptibility to hot cracking .
 fabrication, superalloys, as, LPBF, materials, susceptibility, hot cracking
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:
 fabrication, superalloys, as, LPBF, materials, susceptibility, hot cracking