Selective laser melting of 2507 duplex stainless steel: Effect of energy density on microstructure and corrosion resistance

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-12 DOI:10.1016/j.jmrt.2024.09.078
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Abstract

Duplex stainless steel (DSS) is widely used in the marine, petroleum, chemical, automotive, and other fields owing to its excellent mechanical properties and corrosion resistance. However, the research on duplex stainless steel prepared by additive manufacturing is still limited. In this paper, high-density 2507 DSS was successfully prepared by selective laser melting (SLM) additive manufacturing. The effects of energy density on the formability, phase composition, microstructure and corrosion properties of SLM 2507 DSS were investigated. The results showed that with the decrease of the energy density, the density of the specimen increases first and then decreases, and the density achieves 99.18% with the energy density of 190.5 J/mm3. The types of phases are not affected by the energy density, i.e., all 2507 DSS samples prepared by SLM showed a ferrite phase. The YOZ (parallel to the building direction) plane of the SLM 2507 DSS samples showed predominantly columnar grains attributed to the high temperature gradient and epitaxial growth characteristics. With the increase of energy density, the average grain size decreases slightly from 16.97 μm to 15.78 μm, the KAM value decreases slightly from 1.15 to 1.05, and the low angle grain boundaries (LAGBs) increase significantly from 68.4% to 74.8%. The SLM 2507 DSS sample exhibited excellent corrosion resistance. The self-corrosion potential of the sample is 136 mV and the self-corrosion current density is 2.066 × 10−8 A/cm2 at the maximum density. This investigation provides a new approach for the preparation of super duplex stainless steel, which can provide a theoretical basis and guidance for industrialized application.

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2507 双相不锈钢的选择性激光熔化:能量密度对微观结构和耐腐蚀性的影响
双相不锈钢(DSS)因其优异的机械性能和耐腐蚀性能,被广泛应用于船舶、石油、化工、汽车等领域。然而,通过快速成型技术制备双相不锈钢的研究还很有限。本文采用选择性激光熔化(SLM)增材制造技术成功制备了高密度 2507 DSS。研究了能量密度对 SLM 2507 DSS 的成型性、相组成、微观结构和腐蚀性能的影响。结果表明,随着能量密度的降低,试样的密度先增大后减小,当能量密度为 190.5 J/mm3 时,密度达到 99.18%。相的类型不受能量密度的影响,即所有用 SLM 制备的 2507 DSS 样品都显示出铁素体相。SLM 2507 DSS 样品的 YOZ(平行于构建方向)平面主要呈现柱状晶粒,这归因于高温梯度和外延生长特性。随着能量密度的增加,平均晶粒尺寸从 16.97 μm 微降至 15.78 μm,KAM 值从 1.15 微降至 1.05,低角度晶界 (LAGB) 从 68.4% 显著增加至 74.8%。SLM 2507 DSS 样品表现出优异的耐腐蚀性。样品的自腐蚀电位为 136 mV,最大密度下的自腐蚀电流密度为 2.066 × 10-8 A/cm2。这项研究为超级双相不锈钢的制备提供了一种新方法,可为工业化应用提供理论依据和指导。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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