Magnetic Properties and Hardness of Maraging Steel 08Х15Н5Д2Т and Nondestructive Testing of Retained Austenite in Parts

摘要

Dependences of the coercive force, saturation magnetization, residual induction, relaxation magnetization and magnetic susceptibility, maximum magnetic permeability and associated magnetic field, electrical resistivity, and hardness of maraging steel 008Х15Н5Д2Т on the conditions of preliminary heat treatments, hardening, and subsequent aging have been studied. The content of retained austenite in specially prepared specimens was determined. These specimens were subsequently used to calibrate a differential magnetic instrument. Such an instrument is also used to determine the content of retained austenite in aircraft bolts.