1946
The crack propagation rate and fatigue life of aB-built and heat-treated samples correlated with column boundaries and orientation of the layers , i.e .
 concept or principle: crack propagation rate; machanical property: fatigue life; manufacturing process: heat-treated; concept or principle: correlated; engineering feature: column boundaries; concept or principle: orientation
Please list all entity words in the text that fit the category.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} 
Answer:
 concept or principle: crack propagation rate; machanical property: fatigue life; manufacturing process: heat-treated; concept or principle: correlated; engineering feature: column boundaries; concept or principle: orientation