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The heat treatment transforms the retained austenite , leading to an improvement of the yield stress to 600 MPa .
 manufacturing process: heat treatment; material: retained austenite; machanical property: yield stress; concept or principle: MPa
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:
 manufacturing process: heat treatment; material: retained austenite; machanical property: yield stress; concept or principle: MPa