ASM Houston Presents – A Multi-Method Analysis of Carburized Materials: Accurately Measuring the Carbon Gradient and Comparisons to Physical Characteristics

Thursday, December 10th, 3-4 PM CST

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Carburization is a common method of hardening steel surfaces that must be made wear-resistant for a wide range of mechanical processes.  One critical characteristic of the carburization process is the increase in carbon content that leads to the formation of martensite in the surface layer.  Combustion and spark-OES are two common methods for determination of carbon in steels but in carburized samples these techniques are likely to include carbon from other sources and analyze material throughout material with a gradient of decreasing carbon concentration from the surface layers.  Careful consideration of glow discharge spectroscopy as a method of precisely characterizing carbon concentration in surface layers as part of a production process should be evaluated in terms of how the resulting data align with other common analytical and metallurgical measurements.    When used together, glow discharge spectroscopy, optical microscopy, and microhardness testing are all useful, complementary techniques for characterizing the elemental composition, visually observable changes in material composition, and changes in surface hardness throughout the hardened case, respectively.  Close agreement between related measurements can be used to support the use of each of these techniques as part of a strong quality program for heat treatment facilities.

About the Speaker

Andrew P. Storey is currently LECO’s field sales specialist for digital metallurgical equipment and glow discharge spectroscopy. In this role, he works with LECO’s US and Canadian sales force to develop specialized solutions for customer needs for advanced metallurgical and elemental analyses. He completed his Ph.D. degree in analytical chemistry at Indiana University-Bloomington, where he focused on the application of several different glow discharge sources for novel analyses. Dr. Storey has authored or co-authored 9 peer-reviewed papers in the field, presented at more than 20 conferences, and has collaborated closely with leading glow discharge experts from around the world. His early career included work with organic mass spectrometry for clinical and environmental applications