Adaptation of a Differential Scanning Calorimeter for Simultaneous Electromagnetic Measurements.

Area of Science:

• Materials Science
• Metallurgy
• Physical Chemistry

Background:

• Differential Scanning Calorimetry (DSC) is used to study thermally induced microstructural changes in metals.
• However, complex transformations like recrystallization and tempering are difficult to characterize solely with DSC due to competing signals.
• Magnetic and electromagnetic (EM) responses are associated with these challenging microstructural changes.

Purpose of the Study:

• To develop a novel method for characterizing microstructural changes in metals by combining DSC with EM measurements.
• To improve the analysis of complex metallurgical phenomena that are not fully resolved by DSC alone.
• To create a more comprehensive understanding of thermal-induced transformations in metallic materials.

Main Methods:

• A differential scanning calorimeter (DSC) was modified to incorporate an electromagnetic (EM) sensor with transmitter and receiver coils.
• A custom data acquisition system with a graphical user interface was developed to control the EM sensor and select excitation frequencies (1-100 kHz).
• Simultaneous DSC-EM measurements were conducted on a nickel sample up to 600 °C.

Main Results:

• The integrated DSC-EM apparatus successfully detected the reversible ferromagnetic to paramagnetic transition in nickel via a clear EM response.
• The combined measurements provided complementary data, aiding in the deconvolution of complex signals.
• The system demonstrated potential for analyzing thermally induced microstructural changes.

Conclusions:

• The simultaneous DSC-EM technique offers a powerful new tool for metallurgical analysis.
• This method can enhance the study of microstructural changes in metals, including alloyed steels.
• The findings support advancements in materials science, steel production, and magnetic/conductive material development.