Non-destructive Characterization of Pearlite Spheroidisation by Magnetic Barkhausen Noise Method

摘要

The aim of this study is to investigate the effects of spheroidising heat treatment on steels by Magnetic Barkhausen Noise (MBN) method. Various series of specimens consisting of either lamellar pearlite or partially/completely spheroidised carbides were produced from SAE 1060 steel by appropriate heat treatments. Samples were characterized by metallographic examinations and MBN measurements. The results showed that the evolution of microstructure as a result of spheroidisation, from coarse lamellar carbides to uniformly dispersed spherical carbides in ferrite matrix, is reflected as higher Barkhausen activity due to less effective pinning of domain walls.