激光选区熔化成形LaB6增强316L不锈钢的组织及力学性能
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作者:
作者单位:

1.南京航空航天大学机电学院,南京210016;2.南京航空航天大学能源与动力学院,南京210016;3.南京先进激光技术研究院,南京210046

通讯作者:

赵剑峰,男,教授,博士生导师,E-mail:zhaojf@nuaa.edu.cn。

中图分类号:

TN142

基金项目:

国家重点研发计划(2018YFB1105400,2018YFB1105801)资助项目;国家自然科学基金(51475238,U1537105)资助项目;江苏省重点研发计划(BE2019002)资助项目;南京航空航天大学研究生教育教学改革研究项目“3D打印+仿生机器人”研究生协同培养探索”(2018YJXGG11)资助项目。


Microstructure and Mechanical Properties of 316L Stainless Steel Reinforced by Lanthanum Hexaborate Through Selective Laser Melting
Author:
Affiliation:

1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China;2.College of Energy and Power, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China;3.Nanjing Institute of Advanced Laser Technology, Nanjing 210046, China

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    摘要:

    为进一步提高激光选区熔化成形316L不锈钢制件的力学性能,在316L不锈钢粉末中添加LaB6稀土材料,分析其对成形样件显微组织、显微硬度、拉伸性能和耐磨性能的影响。结果表明:微量添加LaB6的316L不锈钢材料其激光选区熔化(Selective laser melting, SLM)成形工艺窗口发生了偏移,在获取同等致密度制件的条件下可进一步降低激光功率密度;添加的LaB6稀土材料改变了316L材料熔池的熔凝行为,致平均结晶晶粒细化,显微硬度、拉伸强度、屈服强度和耐磨性能得到提高。

    Abstract:

    In order to further improve the mechanical properties of 316L stainless steel parts formed by laser selective melting, 316L stainless steel powder was added with LaB6 rare earth material, and its influence on the microstructure, microhardness, tensile properties and wear resistance of the formed samples was analyzed. The results show that: The selective laser melting (SLM) forming process window of 316L stainless steel with a small amount of LaB6 added is offset, and the laser power density could be further reduced when the same dense parts are obtained; the added LaB6 rare earth material changes the melting behavior of 316L material molten pool, refines the average crystal grains, and improves the microhardness, tensile strength, yield strength and wear resistance.

    表 2 SLM成形316L不锈钢的致密度Table 2 Densification of 316L stainless steel formed by SLM
    表 5 SLM成形件显微硬度Table 5 Microhardness of SLM forming parts
    表 4 SLM成形工艺参数Table 4 SLM forming process parameters
    表 3 SLM成形LaB6/316L样件的致密度Table 3 Densification of LaB6/316L samples formed by SLM
    图1 试验材料形貌Fig.1 Morphology of test material
    图2 SLM成形样件的XRD图谱Fig.2 XRD pattern of SLM forming sample
    图3 SLM成形样件的组织图Fig.3 Organization chart of SLM forming sample
    图4 SLM成形样件拉伸组图Fig.4 Drawing group of SLM forming sample
    图5 拉伸样件断口SEM图Fig.5 SEM of tensile sample fracture
    图6 SLM成形样件的摩擦曲线图Fig.6 Friction curves of SLM forming sample
    图7 SLM成形样件的磨损表面形貌Fig.7 Wear surface morphology of SLM formed samples
    表 1 316L不锈钢粉末的化学成分Table 1 Chemical composition of 316L stainless steel powder
    表 6 拉伸样件的极限抗拉强度和延伸率值Table 6 Ultimate tensile strength and elongation value of tensile sample
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引用本文

蒋佳斌,谢德巧,周凯,肖猛,田宗军,沈理达,赵剑峰.激光选区熔化成形LaB6增强316L不锈钢的组织及力学性能[J].南京航空航天大学学报,2021,53(1):85-92

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  • 收稿日期:2020-03-16
  • 最后修改日期:2020-04-16
  • 在线发布日期: 2021-02-05
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