Authors:

Junyeong Ahn

Date Created:

Not specified

Course Title:

Professor:

Not specified

About Paper:

Quenching is a heat treatment process which enhances hardness and toughness of metal, typically ferrous steel, to a desired level. Due to the low sustainability of the current petroleum-based quenchants, past studies proposed natural oils, such as soy oil or sunflower oil, as candidates for new quench oil replacements. This study aims to characterize the candidates for new quench oil replacements and interrelate the properties to derive general quenching behaviors and to assess the practicality. To determine the quenching mechanism, ASTM D6200 standard is applied to produce cooling curves and cooling rates of each oil. For characterization, degradation point/boiling point, flashpoint, specific heat, viscosity, and chemical composition are measured using thermogravimetric analysis (TGA), flashpoint tester, differential scanning calorimeter (DSC), rheometer, and Fourier-transform infrared spectroscopy (FTIR), respectively. Measured data are collected to establish the database. To determine the practicality of the natural oils, immersion corrosion testing of steel workpiece after quenching in oils of varying degrees of oxidation and fatty acid content have been performed to study the effect of chemical state of oils on corrosion resistance after heat treatment. Future studies will be conducted on refining the ongoing development of machine learning system, which will be an automated tool for navigating the database and produce expected quenching results using the characteristics of the desired quenchant candidate as input and using the identified relationship between the characteristics and quenching behavior as logical process. Keywords: Heat Treatment; Austempering; Natural Oil; Oil Characterization; Sustainability

Source:

Purdue University / 2024

Topics:

No topics listed

Co-authors:

Junyeong Ahn