Evaluation of the spinodal decomposition mechanism in 22Cr–5Ni duplex stainless steel using low-field magnetic analysis

This study proposes the application of low-field magnetic analysis (LFMA) as an alternative nondestructive evaluation method for the detection of microstructural changes of duplex stainless steel due to spinodal decomposition mechanism in a process known as “475°C embrittlement.” Structural, morphological, chemical, mechanical, and magnetic characterizations were performed. Two magnetic methods were used: magnetization versus field measurements at 300 K using a commercial magneto of meter and LFMA testing. The results showed a convergent behavior in agreement with the literature. Experimental results conclusively indicated that the new methodology is consistent and sensitive to the 475°C embrittlement process.