Microstructural Evolution and Properties of 24CrNiMoY Alloy Steel Fabricated by Selective Laser Melting

IF 2.2 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Engineering and Performance Pub Date : 2019-08-19 DOI:10.1007/s11665-019-04280-z

Lianyun Xi, Suiyuan Chen, Mingwei Wei, Jing Liang, Changsheng Liu, Mei Wang

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引用次数: 15

Abstract

24CrNiMoY alloy steel samples were fabricated by selective laser melting (SLM), and a phase transformation model was established to study the alloy steel microstructural evolution. Meanwhile, microhardness and tensile properties of 24CrNiMoY alloy steel prepared by different laser energy densities (E_v) were investigated. Results indicate that the microstructural evolution of 24CrNiMoY alloy steel is consistent with the phase transformation model. The main microstructure changed from martensite to bainite with the increase in thermal cycle numbers. In addition, a suitable E_v plays an important role in refining the bainite structure and improving the alloy steel properties. When the E_v decreases from 210 to 140?J/mm³, the bainite lath width reduces from 1.7 to 0.6?μm. Simultaneously, the relative density, tensile strength and microhardness of the fabricated samples increase first and decrease later. 24CrNiMoY alloy steel sample prepared by 160?J/mm³ has fine mechanical properties: The tensile strength is 850?MPa and microhardness is 360 HV_0.2.

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选择性激光熔化制备24CrNiMoY合金钢的组织演变与性能

采用选择性激光熔化(SLM)法制备24CrNiMoY合金钢试样，建立相变模型，研究合金钢显微组织演变。同时，研究了不同激光能量密度(Ev)制备的24CrNiMoY合金钢的显微硬度和拉伸性能。结果表明，24CrNiMoY合金钢的显微组织演变符合相变模型。随着热循环次数的增加，合金的主要组织由马氏体转变为贝氏体。此外，适当的Ev对细化贝氏体组织和改善合金钢性能具有重要作用。当Ev从210降到140?J/mm3，贝氏体板条宽度由1.7 μm减小到0.6 μm。同时，制备样品的相对密度、抗拉强度和显微硬度均呈先升高后降低的趋势。24CrNiMoY合金钢试样制备160?J/mm3具有优良的力学性能:抗拉强度为850?显微硬度为360 HV0.2。

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来源期刊

Journal of Materials Engineering and Performance 工程技术-材料科学：综合

CiteScore

3.90

自引率

13.00%

发文量

1120

审稿时长

4.9 months

期刊介绍： ASM International''s Journal of Materials Engineering and Performance focuses on solving day-to-day engineering challenges, particularly those involving components for larger systems. The journal presents a clear understanding of relationships between materials selection, processing, applications and performance. The Journal of Materials Engineering covers all aspects of materials selection, design, processing, characterization and evaluation, including how to improve materials properties through processes and process control of casting, forming, heat treating, surface modification and coating, and fabrication. Testing and characterization (including mechanical and physical tests, NDE, metallography, failure analysis, corrosion resistance, chemical analysis, surface characterization, and microanalysis of surfaces, features and fractures), and industrial performance measurement are also covered