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In this work , the additive manufacturing technique of laser powder bed fusion ( L-PBF ) was used to build up X30Mn21 austenitic advanced high strength steel ( AHSS ) samples .
 manufacturing process: additive manufacturing; manufacturing process: laser powder bed fusion; manufacturing process: L-PBF; process parameter: build; material: austenitic; machanical property: strength; material: steel; concept or principle: samples
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: additive manufacturing, laser powder bed fusion, L-PBF, build, austenitic, strength, steel, samples 
Answer:
 manufacturing process: additive manufacturing; manufacturing process: laser powder bed fusion; manufacturing process: L-PBF; process parameter: build; material: austenitic; machanical property: strength; material: steel; concept or principle: samples