Grain Growth Inhibition
Grain growth inhibition prevents the undesirable coarsening of the structure by blocking grain boundary movement. This increases mechanical toughness properties.
Physico-chemical mechanism of action
Grain growth inhibition refers to preventing the further expansion of grain boundaries in the metal by introducing finely distributed foreign phase particles or dissolved atoms. These obstacles slow down the growth process and prevent undesirable coarsening of the structure.
Metallurgical relevance & risks in welding
Without grain growth inhibition, the structure of a metal can become strongly coarsened during cooling. This leads to a loss of mechanical toughness and increases susceptibility to cracks and fractures. Uncontrolled grain growth can lead to a dangerous condition, especially at high temperatures and long cooling times.
Workshop practice & action instructions
To ensure grain growth inhibition, it is important to carefully control welding parameters such as temperature and time. For certain steels or metals, adding special additives or using shielding gases can help slow down grain boundary growth. It is also important to precisely regulate the cooling time and temperature curve to ensure a controlled coarsening of the structure.