CHARACTERISTIC TRANSITION TEMPERATURE OF BRITTLENESS OF LOW CARBON STEEL

摘要

On the basis of analysis of low carbon steel fracture macro-features and micro-processes atlow temperature,the definition was given of the characteristic transition temperature ofbrittleness,Tpm,and its physical meaning was expounded.Discussion was carried out of phys-ical characteristic of variation at Tpm in respect of the fracture toughness and property ofcrack arrest.In addition,research was made on the application of Tpm,which can give infor-mation about the transition of the fracture toughness,the property of crack arrest and criticalcrack size,to estimation the brittleness of low carbon steel at low temperatures.