scholarly journals Structure and Mechanical Properties of Shipbuilding Steel Obtained by Direct Laser Deposition and Cold Rolling

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7393
Author(s):  
Ruslan Mendagaliyev ◽  
Oleg Zotov ◽  
Rudolf Korsmik ◽  
Grigoriy Zadykyan ◽  
Nadezhda Lebedeva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Laser Deposition ◽  
Cold Plastic Deformation ◽  
Initial State ◽  
Austenitic Phase ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Static Tensile ◽  
Rolling Deformation

The study of the formation of microstructural features of low-alloy bainite-martensitic steel 09CrNi2MoCu are of particular interest in additive technologies. In this paper, we present a study of cold-rolled samples after direct laser deposition (DLD). We investigated deposited samples after cold plastic deformation with different degrees of deformation compression (50, 60 and 70%) of samples from steel 09CrNi2MoCu. The microstructure and mechanical properties of samples in the initial state and after heat treatment (HT) were analyzed and compared with the samples obtained after cold rolling. The effect on static tensile strength and impact toughness at −40 °C in the initial state and after cold rolling was investigated. The mechanical properties and characteristics of fracture in different directions were determined. Optimal modes and the degree of cold rolling deformation compression required to obtain balanced mechanical properties of samples obtained by additive method were determined. The influence of structural components and martensitic-austenitic phase on the microhardness and mechanical properties of the obtained samples was determined.

scholarly journals Effect of thermal cycles on the microstructure and mechanical properties of cold-resistant steel 09CrNi2MoCu during laser deposition

2021 ◽  
Vol 2077 (1) ◽  
pp. 012012
Author(s):  
R Mendagaliyev ◽  
O G Klimova-Korsmik ◽  
S Y Ivanov ◽  
K D Babkin ◽  
A M Vildanov
Keyword(s):  
Mechanical Properties ◽  
Three Dimensional ◽  
Calculated Data ◽  
Laser Deposition ◽  
Thermal Cycles ◽  
Initial State ◽  
Microstructure And Mechanical Properties ◽  
Heat Treated ◽  
Direct Laser ◽  
Static Tensile

Abstract The formation of microstructure features of cold-resistant bainite-martensite steel 09CrNi2MoCu has been investigated. Thermal cycles during direct laser deposition were studied. The thermal cycles at different points of the deposited samples were investigated. The thermal cycles and CCT diagrams on microstructure formation and mechanical properties have been analyzed. The numerical calculation of the three-dimensional thermal conductivity problem by the finite element method is carried out. The received data of experimentally measured thermal cycles and the calculated data have shown good coincidence of temperature values. On the basis of the obtained data the calculated dependence of inter-layer temperature at depositing the sample with and without a pause is given. The microstructure and mechanical properties of the samples in the initial state and after heat treatment have been studied and compared with traditional hot rolling. The microstructure features at different pauses between passes in different parts of the obtained samples were revealed. The effect on static tensile and impact toughness at -40°C in the bred and heat-treated state was investigated.

Direct laser deposition of Cu alloy on forming tool surfaces—Process window and mechanical properties

CIRP Annals ◽  
2010 ◽  
Vol 59 (1) ◽  
pp. 211-214 ◽  
Author(s):  
M. Schmidt ◽  
R. Kolleck ◽  
A. Grimm ◽  
R. Veit ◽  
K. Bartkowiak
Keyword(s):  
Mechanical Properties ◽  
Laser Deposition ◽  
Process Window ◽  
Direct Laser Deposition ◽  
Cu Alloy ◽  
Direct Laser

scholarly journals Influence of the Feed Powder Composition in Mechanical Properties of AlN-Nano-Reinforced Aluminium Composites Coatings Deposited by Reactive Direct Laser Deposition

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 926
Author(s):  
Ainhoa Riquelme ◽  
Pilar Rodrigo ◽  
María Dolores Escalera-Rodriguez ◽  
Pablo García-Fogeda ◽  
Joaquín Rams
Keyword(s):  
Mechanical Properties ◽  
Crystalline Structure ◽  
Composite Coatings ◽  
Laser Deposition ◽  
Aluminium Matrix ◽  
Pure Aluminium ◽  
Direct Laser Deposition ◽  
Powder Composition ◽  
Direct Laser ◽  
Nitridation Reaction

Aluminium matrix composite coatings reinforced with AlN nanopaticles have been manufactured by direct laser deposition on an AA6082 alloy substrate. The reinforcement of the composite has been generated by the direct nitridation reaction of the feed powder with the carrier gas (N2) heated by an HPDL beam during the fabrication of the coating. The coating obtained consists of nano-sized AlN particles in an aluminium matrix, and the crystalline structure of the obtained AlN depends on the characteristics of the powder used. In this work, the influence of the feed powder composition is studied by comparison among pure aluminium, Al12-Si alloy, and AA6061 alloy, on the formation of AlN and its crystalline structure. A correlation was established between the temperature distribution reached by the particles, their composition, and the nitridation reaction mechanisms. The effect of the reinforcement was evaluated by comparing the microstructure and mechanical properties (microhardness, nanoindentation) of the composite costing with non-reinforced Al coatings and uncoated AA6082. Al/AlN composite coatings with improved properties were achieved, reaching hardness values that were 65% higher than coatings without reinforcement.

Effect of Heat Treatment on Structure and Properties of Martensite Stainless Steel for Ice-Class Ships Obtained by Direct Laser Deposition Method

2021 ◽  
Vol 1016 ◽  
pp. 725-731
Author(s):  
Olga Gennadyevna Klimova-Korsmik ◽  
R.V. Mendagaliyev ◽  
I.A. Tsibulskiy ◽  
O.G. Zotov ◽  
R.S. Korsmik ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Steel Powder ◽  
Metal Structure ◽  
Laser Deposition ◽  
The Arctic ◽  
Initial State ◽  
Cast Material ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Arctic Conditions

At present, to increase competitiveness of shipyards for manufacturing of shipbuilding parts new high technologies are used. Additive production methods, including direct laser deposition (DLD) technology, which meets all the requirements of competitiveness, are increasingly being applied. Heavy-duty large-size parts such as propellers, blades, hubs and other critical parts used in shipbuilding have become possible to produce with DLD. In the process of DLD it is possible to produce parts, including shipbuilding steels used in the Arctic conditions, with the required mechanical characteristics not inferior to similar brands of materials obtained by casting or plastic deformation methods. The work is devoted to research of thermal process influence on structure and mechanical properties formation of deposited samples from steel powder 06Cr15Ni4CuMo. Features of formation of microstructure components by means of optical microscopy, X-ray structure analysis (XRD) are investigated, and also CCT diagram is constructed. Tensile and impact toughness tests have been conducted. As a result, it was found that the material obtained by the DLD method in its initial state significantly exceeds the strength characteristics of heat-treated castings of similar chemical composition, but is inferior to it in terms of plasticity and viscosity. The increase of viscosity and plasticity up to the level of cast material in the grown samples is achieved during the subsequent heat treatment, which leads to the formation of the structure of tempered martensite and reduction of its content in the two-stage tempering in the metal structure. The strength of the material is also reduced to cast metal after heat treatment.

scholarly journals High-Strain Deformation and Spallation Strength of 09CrNi2MoCu Steel Obtained by Direct Laser Deposition

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1305
Author(s):  
Olga Klimova-Korsmik ◽  
Gleb Turichin ◽  
Ruslan Mendagaliyev ◽  
Sergey Razorenov ◽  
Gennady Garkushin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Elastic Limit ◽  
Spall Strength ◽  
High Strength ◽  
Strength Properties ◽  
Laser Deposition ◽  
Initial State ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Hot Rolled

In this work, the critical fracture stresses during spalling of high-strength steel 09CrNi2MoCu samples obtained by direct laser deposition (DLD) were measured under shock compression of up to ~5.5 GPa. The microstructure and mechanical properties of DLD steel samples in the initial state and after heat treatment were studied and compared to traditional hot rolled one. The microstructural features of steel before and after heat treatment were revealed. The heat treatment modes of the deposit specimens on their strength properties under both static and dynamic loads have been investigated. The spall strength of the deposited specimens is somewhat lower than the strength of steel specimens after hot rolling regardless of their heat treatment. The minimum elastic limit of elasticity is exhibited by the deposit specimens. After heat treatment of the deposit samples, the elastic limit increases and approximately doubles. Subsequent heat treatment in the form of hardening and tempering allows obtaining strength properties under Hugoniot loads in traditional hot-rolled products.

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

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2738 ◽  
Author(s):  
Ruslan Mendagaliev ◽  
Olga Klimova-Korsmik ◽  
Vladimir Promakhov ◽  
Nikita Schulz ◽  
Alexander Zhukov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Impact Toughness ◽  
Relative Elongation ◽  
Steel Powder ◽  
Structural Features ◽  
Laser Deposition ◽  
Initial State ◽  
Cast Material ◽  
Direct Laser Deposition ◽  
Direct Laser

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.

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