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Induction Heat Treatment of Gears and Gear-Like Components
Published in Stephen P. Radzevich, Advances in Gear Design and Manufacture, 2019
At temperatures of austenite phase, some of the graphite particles can go into solution by diffusing (fully or partially) into the matrix in proximity to nodules (for ductile cast irons) or flakes (for gray cast irons). This can locally deviate chemical composition, increase the carbon level in the austenite, shift continuous cooling transformation (CCT) curves, affect martensitic formation and Ms temperatures, as well as the amount of retained austenite (RA). This tendency is an important metallurgical factor representing one of the major differences between hardening cast irons versus steels and potentially resulting in a variable amount of carbon in as-quenched structure. Taking into consideration that the great majority of gears and gear-like components are made of steels or PM materials, there will not be a discussion on metallurgical subtleties of induction hardening of cast irons here. Interested readers should review publications [1,9] on this subject.
Prediction of continuous cooling transformation diagram for weld heat affected zone by machine learning
Published in Science and Technology of Advanced Materials: Methods, 2022
Satoshi Minamoto, Susumu Tsukamoto, Tadashi Kasuya, Makoto Watanabe, Masahiko Demura
To evaluate the performance of structural steels, understanding its microstructure after processing is crucial. The continuous cooling transformation (CCT) diagram of a steel plays an important role in providing information on the steel microstructure, as the information includes the start temperatures of phase transformation during cooling, as well as hardness. Since the actual CCT diagram varies significantly with material composition, the CCT diagram has to be constructed for each steel on the basis of experimental results. However, organizing the CCT information obtained for a specific steel is a highly experimental and time-consuming process, and it is difficult to immediately increase the amount of information.