Study On Microstructure And Mechanical Properties Of T10Steel Quenched By Atomized Water With Nitrogen Gas

Manufactures of metals and alloys are widely used in everyday engineering and mechanical fields. Heat treatment is an important method to improve the material properties of metals and alloys, and is the key process of mechanical manufacturing, among which atomized water with Nitrogen gas quenching is a new heat treatment industry and attracted wide attention at home and abroad quench research, for its many advantages. In order to make a in-depth study the performance changes of metals and alloys after atomized water with Nitrogen gas quenching treatment, this article takes a theoretical and experimental study of this method, combined with different subjects, and take an example of T10steel which is widely used to compare the changes in stretch, fatigue and impact properties of T10steel after different atomized water with Nitrogen gas quenching.In this article, T10steel were divided into tension, fatigue and impact test pieces and then were subjected to atomized water with Nitrogen gas quenching and water quenching under different conditions. And then the quenched specimens and not quenched specimens were subjected to axial tension test, axial tension-tension fatigue test and charpy impact test, thus comparing the changes of T10steel in tensile, fatigue properties and impact properties after quenching under different processing conditions. After the study of theories and experiments, several conclusions are achieved as follows:After atomized water with Nitrogen gas quenching, the original pearlitic structure of the specimen turn into troostite, martensite and carbides under different cooling speed. The content of martensite increased when the amount of water increased, while the content of the troostite decreased when the amount of water increased. The treatment of atomized water with Nitrogen gas quenching can significantly increase the hardness of the specimen, the hardness of the specimen after quenching increases with the increase of water.The treatment of atomized water with Nitrogen gas quenching can improve the yield and tensile strength of T10steel significantly. Under the same nitrogen pressure, the plasticity of the specimen weakened when the amount of water increased. The fracture of tensile specimen of plastic fracture is a typical cup cone fracture.The treatment of atomized water withNitrogen gas quenching can improve the fatigue limit of T10steel significantly. Under the same nitrogen pressure, the S-lgN dispersion curve increased when the amount of water increased. The fatigue fracture includes three sections, that is the fatigue crack initiation, expansion area, and instant-off area, all of which are brittle fracture.After the treatment of atomized water with Nitrogen gas quenching the impact energy of the specimen increased. Under the same nitrogen pressure, the impact energy of the specimen first increased and then decreased when the amount of water increases. After quenching, the higher the hardness of the specimen, the lower the impact energy the specimen absorbed. The research about the microstructure and mechanical properties of T10which been treated through atomized water with Nitrogen gas quenching, show that the quenching can control the properties of specimens by adjust the amount of water. And the range is wide.