Microstructure and Properties of the Aluminum Alloyed with ZrO Powder Using Fiber Laser

The scope of the work covers the development of the relationship between the chemical composition of surface-modified aluminium and its mechanical properties. This article presents the impact of laser alloying with ZrO powder on the microstructure and mechanical properties of pure aluminium. In order to study the phenomena occurring during the laser alloying process, microstructural studies were carried out using optical microscopy. Additionally, the properties of the obtained alloy were tested - abrasion resistance and hardness measured at low load force. As a result of the alloying process, three distinct zones were identified: the remelting zone (RZ), the diffusion zone (DZ) and the heat affected zone (HAZ). The surface modification resulting from laser alloying increases the hardness and abrasion resistance of the material.

Getting wear-resistant coatings on aluminum alloys by laser alloying

A method to improve the properties of aluminum alloys by laser surface alloying is considered. The optimal selection of alloying elements is carried out. It is shown that this method of hardening increases the wear resistance and reduces the friction ratio of the hardened surface.

Influence of homogenizing annealing on reducing the content of δ-ferrite in high-strength high-chromium martensitic steel grade 07Kh15N5D4B obtained by selective laser alloying

The work studies effects of temperature – time parameters of homogenizing annealing and related structural changes on the content of δ-ferrite in high-chromium martensitic steel grade 07Kh15N5D4B, obtained by selective laser alloying. It is shown that homogenizing annealing at a temperature of 1150°C with a holding time for 8 hours reduces the content of δ-ferrite, eliminates the cellular structure, and also increases the strength properties of the above-mentioned steel.