Heat Treatment of Corrosion Resistant Steel for Water Propellers Fabricated by Direct Laser Deposition.

Ruslan Mendagaliev,Andrey Olisov,Vladimir Promakhov,Alexander Zhukov,Olga Klimova-Korsmik,Nikita Schulz,Viktor Klimenko

doi:10.3390/ma13122738

Abstract

The urgency of heat treatment of samples of maraging steel obtained by direct laser deposition from steel powder 06Cr15Ni4CuMo is considered. The structural features and properties of 06Cr15Ni4CuMo steel samples after direct laser deposition and heat treatment are studied. The work is devoted to research into the influence of thermal processing on the formation of structure and the mechanical properties of deposit samples. Features of formation of microstructural components by means of optical microscopy are investigated. Tests for tension and impact toughness are conducted. As a result, it was established that the material obtained by the direct laser deposition method in its initial state significantly exceeds the strength characteristics of heat treatment castings of similar chemical composition, but is inferior to it in terms of impact toughness and relative elongation. The increase in relative elongation and impact toughness up to the level of cast material in the deposit samples is achieved at the subsequent heat treatment, which leads to the formation of the structure of tempered martensite and reduction in its content at two-stage tempering in the structure of the metal. The strength of the material is also reduced to the level of cast metal.

Highlights

To increase the competitiveness of shipyards for the manufacture of parts of marine engineering, new high-tech technologies are used
In the direct laser deposition technology (DLD) process it is possible to obtain parts, including from shipbuilding steels used in the Arctic
Heat deposition impacts presence retained austenite and δ-ferrite in the structure of the samples fabricated by Residual austenite of retained austenite and δ-ferrite [28] in the structure of the samples fabricated by DLD

Summary

Introduction

To increase the competitiveness of shipyards for the manufacture of parts of marine engineering, new high-tech technologies are used. Additive manufacturing methods are increasingly being used, including direct laser deposition technology (DLD). In the DLD process it is possible to obtain parts, including from shipbuilding steels used in the Arctic. Iron and its modified alloys are the most important class of metallic materials used in shipbuilding. As a result of the research on estimation of material characteristics in 1980, this has been developed and mastered in the industry of martensitic–austenitic stainless steel (CA6NM—06Cr15Ni4CuMo) for manufacturing compressors [3], propeller blade [4,5,6,7], castings of blades, components of chemical and oil industry and other cast details of responsible purpose, and for the manufacture of large

Methods

Results

Discussion

Conclusion