<title>Features of structure formation by laser alloying of steels with carbon-boron-chromium composition</title>

Abstract

In work the features of formation of structure and properties of superficial layers are investigated during laser alloying of a surface of low-, middle- and high-carbon steels with the help of the powder composition, consisting from chromium and carbide of boron. The analysis of the obtained results shows that at laser alloying of a steel surface the firm laser layer with the rather homogeneous structure is formed. The structure of this layer consists of considerably oversaturated solid solutions and hardened phases as smallest particles both of carbides and borides of iron and chromium. It is shown, that even the heating to high temperatures down to 900 degrees C done not lead to integration of hardened phases, that speaks about high stability of structure at laser alloying. The high thermal stability of structure provides preservation of high hardness of the laser alloyed layer. The hardness of a surface remains at a level 6.5-7.0 GPa even after heating up to 900 degrees C.