This paper discusses a novel heat treatment method that utilizes differential thermocouple analysis to provide real-time feedback on phase transformations, enabling exceptional control over the heat treatment process. Real-world applications of this method are identified, demonstrating its seamless integration with differential heat treatment techniques. This approach allows for the creation of mechanical properties that are variable and tailored to specific end uses, such as achieving high strength in one area and high fatigue resistance in another. Additionally, this method can lead to a new form of thermo-mechanical heat treatment. In this process, differential heat treatment is first applied to create variable properties, followed by laser peening to generate dislocations that are subsequently trapped by further heat treatment. This results in extraordinary fatigue resistance in the core section while maintaining high strength on the outer surface. This technology introduces capabilities that are currently unavailable in industrial heat treating.

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