I have a question: regarding the reduction in hardness through low-temperature annealing
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Isn’t hardness related to the internal structure? During low-temperature annealing, when the temperature is raised below the phase transition temperature, the steel has not yet been austenitized; therefore, no phase transformation should occur throughout the entire annealing process, right? So how can the hardness be reduced? Big brother, please explain the reason
This subject is too boring. The entire textbook on heat treatment is filled with professional, monotonous, and dull text.
Hardness is related to a material’s tensile strength; materials with higher tensile strength have greater hardness. However, the hardness of the same material can vary under different conditions, such as due to work hardening, quenching, welding stresses, etc., and it can be reduced through low-temperature tempering
The last edit to this post was made by wanlirn on 2020-3-12 at 10:00. The hardness resulting from low-temperature annealing (tempering) refers to the hardness that arises from secondary processing such as rolling, coiling, and welding seams; I call this \"processing hardness\". As for the hardness that results from the metallurgical processes in the material, such as the presence of martensite, I call this \"microstructural hardness\"