Non-destructive Prediction Method and Experimental Investigation of Metallographic Occupation Ratio in Duplex Steel Based on J-A Model

doi:10.3901/JME.2025.14.142

Abstract

Abstract: Duplex steels are steels composed of martensite or austenite with a ferrite matrix, and the mechanical properties of the material are varied for steels with different metallographic occupancies. Optical metallographic observation is the most widely used method for metallographic identification of steel materials, and before observation, steps such as grinding and erosion are required to be carried out on the measured object, which results in the destruction of the structural integrity of the material surface. To realize the non-destructive assessment of the metallographic percentage of duplex steel materials, the hysteresis detection results of five kinds of duplex steels are experimentally tested, a hysteresis model based on the J-A equation is established, and the hysteresis results with the highest martensite and ferrite contents are selected as the known terms. The hysteresis results of the other three materials are predicted by using the diphasic response dose function based on the experimental measurements of the steel grades with high martensite and ferrite contents. The diphasic response dose function is applied for materials with close content of both phases, and the predicted results are compared with the experimental results. The analysis results show that the prediction method of metallographic organization occupancy based on the J-A model can be used to characterize the change rule of coercivity, which is positively correlated with martensite occupancy. Furthermore, the reason why the remanent magnetism and saturation magnetic induction strength are inconsistent with the experimental results is analyzed.

Key words: Jiles-Atherton model, duplex steel, metallographic percentage, non-destructive testing

CLC Number:

TH878

WU Bin, ZHOU Xinhua, WANG Yujue, LIU Xiucheng, LI Peng. Non-destructive Prediction Method and Experimental Investigation of Metallographic Occupation Ratio in Duplex Steel Based on J-A Model[J]. Journal of Mechanical Engineering, 2025, 61(14): 142-149.

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