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Microstructure and mechanical properties of additively manufactured multi-material component with maraging steel on CrMn steel

机译：CRMN钢上的含有Maring Multim Mattersured Multim材料成分的组织和力学性能

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摘要

High manufacturing freedom of additive manufacturing (AM) technology, such as selective laser melting (SLM), innovates an effective way for the fabrication of multi-material components which is highly challenging or even impossible for the conventional manufacturing processes. The bonding performance between dissimilar materials in the AMed multi-material component needs further research prior to application. In this study, maraging steel (MSI) part was manufactured on top of the cast CrMn steel using SLM to obtain a multi-material component. The microstructure of CrMn steel substrate and MSI steel, as well as the interfacial morphology of the hybrid CrMn-MS1 component, was characterized to study the metallurgical property. The microhardness and tensile property tests were conducted to investigate the mechanical behaviour of the hybrid cast/SLM multi-material component. An interface with a width of about 130 um was formed between the two dissimilar materials. Marangoni convection caused complex phenomena at the interface, leading to the cross-regional distribution of alloy elements and a variation in the microstructure of the first several layers of SLMed MSI. Good metallurgical bonding of the dissimilar materials manufactured by SLM is achieved without pores, inclusions or cracks in the interfacial region. The microhardness value of the interface region is 309 ± 9 HV0.05 . This mitigates the difference in performance mismatch by smoothening the mechanical-property transition between CrMn steel (277 ±11 HV0.05) and SLMed MSI (360 ± 9 HV0.05). The hybrid CrMn-MSl steel presents a higher ultimate tensile strength of 986 ± 30 MPa than cast CrMn steel and higher elongation of 24.5 ± 1.0% than SLMed MSI. This study proves feasibility to manufacture a reliable multi-martial component with a cast substrate and SLMed part of potentially higher complexity.
机译：高制造自由度的添加剂制造（AM）技术，例如选择性激光熔化（SLM），创新了一种用于制造多材料部件的有效方法，这对于传统的制造工艺具有高度挑战或甚至不可能。在施用之前，AMED多材料组分中不同材料之间的粘合性能需要进一步的研究。在本研究中，使用SLM在铸造CRMN钢顶部制造钢（MSI）部分以获得多重材料组分。 CRMN钢基材和MSI钢的微观结构，以及杂交CRMN-MS1组分的界面形态，其特征在于研究冶金性能。进行显微硬度和拉伸性能测试以研究杂交铸造/ SLM多材料组分的力学行为。在两个不同的材料之间形成具有约130μm的宽度的界面。 Marangoni对流引起了界面的复杂现象，导致合金元素的交叉区域分布和第一几层SLMED MSI的微观结构的变化。通过SLM制造的不同材料的良好冶金结合在没有孔隙区域，界面区域中的孔，夹杂物或裂缝实现。界面区域的显微硬度值为309±9 HV0.05。这通过平滑CRMN钢（277±11 HV0.05）和SLMED MSI（360±9 HV0.05）之间的机械性能转换来减轻性能不匹配的差异。混合CRMN-MSL钢的最终拉伸强度高于铸造CRMN钢，比SLMES MSI更高的伸长率，较高的伸长率为24.5±1.0％。本研究证明可行性制造可靠的多武术组分，其具有浇铸基材和潜在更高的复杂性的SLMED部分。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140630.1-140630.10|共10页
  • 作者

    Yuchao Bai; Cuiling Zhao; Yu Zhang; Hao Wang;

  • 作者单位

    Department of Mechanical Engineering Faculty of Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore;

    Department of Mechanical Engineering Faculty of Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore;

    Department of Mechanical Engineering Faculty of Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore;

    Department of Mechanical Engineering Faculty of Engineering National University of Singapore 9 Engineering Drive 1 Singapore 117575 Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; Multi-material; Microstructure; Mechanical properties; Maraging steel; CrMn steel;

    机译：选择性激光熔化;多材料;微观结构;机械性能;钢铁;CRMN钢铁;

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