According to ASTM E975 [4] standards, the
amount of retained austenite in steels can be calculated using Eq. 1 from the peaks in the X-ray pattern.
Choosing the scanning angles and austenitic and martensitic peaks is very important in evaluating the
amount of retained austenite. For confirmation reasons, two standard samples with 3.97% and 14.7%
austenite were processed using different scanning rates.