6745
The uniform surface morphology , removal of partially melted particles , absence of pores and cracks , decrease in Sa , and moderate improvement in corrosion resistance suggests that LPEB irradiation can be used as a post-treatment for SLM-MS samples .
 process characterization: surface morphology; concept or principle: melted; machanical property: pores; concept or principle: corrosion resistance; manufacturing process: irradiation; material: be; material: as; manufacturing process: post-treatment; 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: surface morphology, melted, pores, corrosion resistance, irradiation, be, as, post-treatment, samples 
Answer:
 process characterization: surface morphology; concept or principle: melted; machanical property: pores; concept or principle: corrosion resistance; manufacturing process: irradiation; material: be; material: as; manufacturing process: post-treatment; concept or principle: samples