How to understand the martensitic phase transformation problem
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There is a sentence in a reference book that states: the hydrogen-induced martensitic transformation and the cold working-induced martensitic transformation are essentially the same. The question is: What is the martensitic transformation, and what effects does it have on materials?
When steel is cooled rapidly from the austenite state, the diffusion-free phase transformation that occurs at lower temperatures is called the martensitic transformation; this process strengthens and hardens the steel. Hydrogen-induced martensitic transformation can lead to the formation of cold cracks
The martensitic phase transformation is a microscopic change that occurs within a certain temperature range. During this transformation, temperature is the primary factor that triggers it, and once the transformation takes place, the properties of the material also change!
After austenitization, steel is rapidly cooled to prevent its diffusive decomposition; the transformation that occurs at lower temperatures is known as the martensite transformation. Martensite is relatively hard. It’s hard to explain in just a few sentences; see Xu Zuyao’s “Martensitic Phase Transformation and Martensite” for more details.