TiB_(2)/18Ni300复合材料选区激光熔化成形形貌与组织性能研究  

Study on the Morphology and Microstructure Properties of TiB_(2)/18Ni300 Composite Materials by Selective Laser Melting Forming

作　　者：陈智强 梅丽芳 严东兵 殷伟 梁雨 Chen Zhiqiang;Mei Lifang;Yan Dongbing;Yin Wei;Liang Yu(College of Mechanical and Automotive Engineering,Xiamen University of Technology,Xiamen 361024,Fujian,China;Fujian Key Laboratory of Advanced Design and Manufacture for Bus&Coach,Xiamen 361024,Fujian,China;Xiamen Key Laboratory of Intelligent Manufacturing Equipment,Xiamen 361024,Fujian,China)

机构地区：[1]厦门理工学院机械与汽车工程学院,福建厦门361024 [2]福建省客车先进设计与制造重点实验室,福建厦门361024 [3]厦门市智能制造高端装备研究重点实验室,福建厦门361024

出　　处：《应用激光》2025年第2期40-49,共10页Applied Laser

基　　金：福建省科技计划引导性项目(2022H0055);福建省科技计划对外合作项目(2020I0026)。

摘　　要：采用选区激光熔化技术制备TiB_(2)/18Ni300复合材料,研究不同质量百分比的TiB_(2)增核剂对复合材料成形试样的表面形貌、微观结构、元素与物相分布以及力学性能的影响。结果表明:随着TiB_(2)质量百分比的增加,试样顶面粗糙度和孔隙增大且球化加重;凝固组织由胞状晶逐渐转变为柱状晶,各试样Ti元素分布均匀,主要晶化相均为α-Fe马氏体,但α(110)衍射峰的强度逐渐增加;试样的维氏硬度和拉伸强度均呈现先增大后减小的变化规律,延展性则逐渐减小。当TiB_(2)粉末质量分数为0.5%时,成形试样硬度和拉伸强度均达到最大值,分别为409 HV和1485.8 MPa,相较于单一18Ni300成形试样分别提高了15.78%和53.1%。断裂方式由单一18Ni300成形试样的塑性断裂,转变为塑性-脆性复合断裂。TiB_(2)/18Ni300 composites with different mass fractions of TiB_(2) were prepared by selective laser melting technique,and the effects of different mass fractions of TiB_(2) on the surface morphology,microstructure,EDS spectra,XRD phase structure and mechanical properties of the specimens prepared were investigated.The results showed that with the increase of the TiB_(2) mass fraction,top surface of the specimens roughened,the spheroidization effect was enhanced,and the surface porosity enlarged.Meanwhile,the cellular crystal-type solidified structure gradually changed to columnar crystals,in which Ti elements were uniformly distributed.The main crystalline phases of the specimens were α-Fe martensite,with a gradually increasingly intensified diffraction peak.Moreover,the Vickers hardness and tensile strength of the specimens showed a change trend of increasing at first and then decreasing,and the ductility gradually decreased.The specimen containing 0.5%TiB_(2) had the greatest hardness and tensile strength,which were 409 HV and 1485.8 MPa,15.78% and 53.1% higher than those of the 18Ni300 specimen without TiB_(2) powder addition,respectively.Different from the plastic fracture of the 18Ni300 specimen,the fracture mode of the TiB_(2)/18Ni300 specimen was plastic and brittle fractures.

关 键 词：选区激光熔化 TiB_(2)/18Ni300复合材料 表面形貌 微观结构 力学性能 

分 类 号：TN249[电子电信—物理电子学]