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The severe thermal gradients associated with selective laser melting ( SLM ) additive manufacturing ( AM ) generate large residual stresses ( RS ) that geometrically distort and otherwise alter the performance of printed parts .
 process parameter: thermal gradients; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: additive manufacturing; manufacturing process: AM; machanical property: residual stresses; concept or principle: performance
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: thermal gradients, selective laser melting, SLM, additive manufacturing, AM, residual stresses, performance 
Answer:
 process parameter: thermal gradients; manufacturing process: selective laser melting; manufacturing process: SLM; manufacturing process: additive manufacturing; manufacturing process: AM; machanical property: residual stresses; concept or principle: performance