Ductile-Brittle Transition Temperature

Ductile-brittle transition temperature is the temperature at which metallic materials undergo transition from a ductile state to a brittle state. It is represented by T_k, also known as plastic-brittle transition temperature, or brittle transition temperature. It is used to characterize the embrittlement tendency of metal materials. The magnitude of the tendency is generally determined by the impact test, but there are many test indexes which have not been finalized (see Strengthening of Metal). Impact test is a test to determine the ability of metal materials to resist impact loads, also known as impact ductility test, and is one of the basic methods for testing material mechanical performance. In the impact test, the energy consumed by breaking the sample is called impact energy (A_k), and its unit is Joule (J). A_k is divided by the cross-sectional area F of the notch of the sample to obtain the material impact value A_k/F=a_k, whose unit is J/cm². a_kcan be used to evaluate the...