The article presents the results of impact strength tests at -40 ºC for Cr-Mo-V-Cu-Ni type cast steels. The research was based on statistical methods of experimental design. The obtained results were subjected to statistical analysis, which was used to determine the equations of the research object’s function, its dependence on independent variables, and to determine the range of chemical composition variability of cast steel with the highest impact strength at sub-zero temperatures.There are known cases of brittle fracture of machines and structures at sub-zero temperatures.
The phenomenon of cold brittleness became a subject of research at the end of the 19th century. Rails, railway bridges, as well as ships, tanks, and gas pipelines were cracking. Moreover, disasters occurred most frequently at high latitudes, during winter, at low temperatures [1].
Materials that are required to be resistant at sub-zero temperatures are most often subjected to tests of properties in static tensile tests, impact strength, and fatigue strength.
A special place among these tests is occupied by the popular and widely used impact strength test. Impact strength is an effective measure of a material’s susceptibility to brittle fracture and the ductile-to-brittle transition temperature. (…)
The article contains 9098 characters.
Source: Logistyka Magazine
The influence of chemical composition on the impact strength of cast steel – PDF file for download