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Abstract
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.
Highlights
Accepted: 30 November 2021With the development of modern production technologies, it has become possible to obtain products using additive technologies [1]
Additive processes are increasingly being used in the shipbuilding industry, for example, to manufacture products made of cold-resistant steel [3]
We investigate the microstructure of an alloy directly after direct laser deposition (DLD) and subsequent heat treatment (HT)
Summary
With the development of modern production technologies, it has become possible to obtain products using additive technologies [1]. Additive manufacturing technologies are still at the implementation stage. The most common manufacturing methods still use traditional technologies and combined methods [2]. Additive processes are increasingly being used in the shipbuilding industry, for example, to manufacture products made of cold-resistant steel [3]. Additive manufacturing (AM) has gradually been introduced in the shipbuilding industry for the production of small- to medium-sized spare parts [4] and it has been used for layer-by-layer construction of larger structural components such as hollow propeller blades [5], propeller brackets, and foremasts. Some shipbuilding departments are converting steps in the production process to AM technology in order to reduce production costs and increase component productivity
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