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In this paper , maraging steel powder was deposited on top of an H13 tool steel using laser powder bed fusion ( LPBF ) technique .
 maraging steel, H13 tool steel, laser powder bed fusion, LPBF
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:
 maraging steel, H13 tool steel, laser powder bed fusion, LPBF