6100
To understand the fundamentals of microstructure formation in an electron beam melting ( EBM ) additive-manufacturing process , which is classified as a type of electron beam powder bed fusion ( EB-PBF ) in ISO562910/ASTM-F42 , single bead experiments were conducted by using an electron beam to scan an IN718 plate , using various combinations of power and scan speed , focusing on the relationship between ( i ) the beam irradiation level , ( ii ) the melt pool geometry , and ( iii ) the solidification microstructure .
 microstructure, electron beam melting, EBM, process, as, electron beam, bed fusion, bead, electron beam, IN718, power, scan speed, beam, melt pool, geometry, solidification microstructure
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:
 microstructure, electron beam melting, EBM, process, as, electron beam, bed fusion, bead, electron beam, IN718, power, scan speed, beam, melt pool, geometry, solidification microstructure