Abstract
Based on electromagnetic theory, metallurgical characteristics can be detected by eddy current nondestructive testing technology. In this study, the relationship between the surface microstructure and the eddy current output of martensitic stainless steel AISI 410 was studied using this technology at different quenching temperatures. The mechanical properties include material hardness, microstructure types and microstructural changes after thermal treatment was evaluated. Using Vickers hardness as the surface hardness index of AISI 410 steel, the relationship between eddy current output signal, in terms of impedance and inductance, and sample surface hardness was studied and the effects of different quenching temperatures on the steel’s surface hardness was examined. In addition, the change of microstructure types of AISI 410 steel after thermal treatment was detected by the eddy current nondestructive testing method, and the results were verified by metallographic microscopy.
Highlights
Martensitic stainless steel (MSS), with its good combination of high strength and ductility, has become a new type of stamping steel, which is widely used in the automotive and general industries and the national defense industry [1,2]
The steel sample microstructure was analyzed regarding the effects on the hardness and eddy current output at different quenching temperatures using eddy current nondestructive
The above experiment showed that the detection results from the eddy current sensor were consistent with the microstructural analysis, which verified the predictive reliability of this eddy current testing method
Summary
Martensitic stainless steel (MSS), with its good combination of high strength and ductility, has become a new type of stamping steel, which is widely used in the automotive and general industries and the national defense industry [1,2]. The structure of MSS stainless is composed of martensite, ferrite, and a small amount of carbide It is the martensite in the steel that improves the steel’s wear resistance and surface strength. An eddy current nondestructive testing method measures changes in the impedance signal of a testing coil to characterize the changes in a material’s metallographic composition, such that it reflects the changes in material hardness. Zergoug et al [6] have studied the relationship between mechanical and impedance change by ECT, indicating that this method can detect and quantitatively analyze the mechanical properties of metal materials, such as aluminum and steel without damage. The same batch of AISI 410 MSS specimens was found to exhibit different martensitic content after different quenching treatments and differences in surface metallographic structure in different samples led to different output responses from the eddy current sensor as well as different surface harnesses.
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