Structure and mechanical properties of shipbuilding steel produced by direct laser deposition and hot rolling

Abstract

The structure and properties of specimens obtained by direct laser deposition from 09CrNi2MoCu steel have been investigated. The results of anisotropy of properties and structural heterogeneity induced by high rate of obtaining cold-resistant steel specimens are presented. It is shown that the content of residual austenite and cementite in the steel structure, after direct laser deposition at the boundaries of fusion rolls is significantly higher, which contributes to anisotropy. Rolling of the deposit specimens was carried out in order to reduce the anisotropy of properties and to increase the strength and plastic properties. In the work two rolling technologies are considered: hardening from furnace heating and from rolling heating, as well as the next high tempering.