| 激光增材制造镍基复合材料界面连接机制与断裂行为 |
| |
| 引用本文： | 高永康,陈洪胜,聂慧慧,薛柏林,刘润爱,郑留伟,王文先,陈晓春. 激光增材制造镍基复合材料界面连接机制与断裂行为[J]. 复合材料学报, 2023, 40(3): 1797-1806. DOI: 10.13801/j.cnki.fhclxb.20220419.006 |
| |
| 作者姓名： | 高永康 陈洪胜 聂慧慧 薛柏林 刘润爱 郑留伟 王文先 陈晓春 |
| |
| 作者单位： | 太原理工大学 机械与运载工程学院,太原 030024;太原理工大学 机械与运载工程学院,太原 030024;智能水下装备山西省重点实验室,太原 030024;太原理工大学 分析测试中心,太原 030024;智能水下装备山西省重点实验室,太原 030024;太原理工大学 材料科学与工程学院,太原 030024 |
| |
| 基金项目： | 国家自然科学基金(51805358);山西省晋中市重点研发计划(Y201023);山西省自然科学基金(201901D111057);大学生创新创业训练计划项目(202010112011;202110112026) |
| |
| 摘 要： | 基于颗粒增强镍基复合材料优异的结构/功能特性,在航空航天、核电军工和电子电工等领域有着广泛的应用前景。本文选用机械球磨混粉+激光选区熔化方法 (SLM)制备了碳化钨(WC)颗粒增强IN718复合材料(WC/IN718),对复合材料内部异质界面连接机制、强化机制和断裂行为进行了分析。研究结果表明：随着WC颗粒含量的增加(0wt%～20wt%),试件成形良好,WC颗粒均匀分布在基体内部,异质界面处无缺陷产生,界面处产生了贫碳的W2C层和碳化物层,基体合金主要呈柱状晶生长。由于熔池内部能量密度分布不同,低温位置WC颗粒的断裂方式为先形成界面反应层后由热应力引起断裂,高温位置WC颗粒优先发生断裂,断裂成小尺寸颗粒,后与熔化的基体合金形成界面反应层,弥散分布在基体内部。随着WC颗粒含量的增加,复合材料的强度呈现升高的趋势,而断裂韧性降低,抗拉强度最高可达1 280 MPa,强化机制主要为载荷传递强化,断裂机制为WC颗粒的脆性断裂和基体合金的韧性断裂。
|
| 关 键 词： | WC/IN718复合材料 异质界面连接 断裂机制 强化机制 颗粒增强镍基复合材料 |
| 收稿时间： | 2022-03-04 |
Interface connection mechanism and fracture behavior of nickel-based composites fabricated by selective laser melting |
| |
| Affiliation: | 1.College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China2.Shanxi Key Laboratory of Intelligent Underwater Equipment, Taiyuan 030024, China3.Analysis and Test Center, Taiyuan University of Technology, Taiyuan 030024, China4.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
| |
| Abstract: | Based on the excellent structural/functional properties of particle-reinforced nickel-based composites, they have a wide application prospects in aerospace, nuclear power, military industry and electronics. The internal heterogeneous interface connection mechanism, reinforcement mechanism and fracture behavior of the tungsten carbide (WC) particle-reinforced IN718 composites (WC/IN718) prepared by using the mechanical ball grinding powder+selective laser melting (SLM) was analyzed. The results show that with the increase of WC particles content (0wt%-20wt%), the specimen is well-formed, WC particles are evenly distributed inside the matrix and no defects at the heterogeneous interface, carbon-poor W2C layer and carbide layer are produced at the interface, and the matrix alloy mainly grows at the form of columnar crystals. Due to the different energy density distribution within the melting pool, the fracture mode of WC particles at the low temperature position is that firstly the interface reaction layer form at the periphery of WC particle and then WC are fractured by thermal stress. However, WC particles at the high temperature position preferentially break into small particles in size, and then the interface reaction layer is formed with the molten matrix alloy, which is distributed within the matrix. As the content of WC particles increases, the strength of composites tends to increase, while the fracture toughness is reduced, and the tensile strength can be up to 1280 MPa. The reinforcement mechanism is mainly the load transfer effect, the fracture mechanism is the brittle fracture of WC particles and the toughness fracture of matrix alloy. |
| |
| Keywords: | |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《复合材料学报》浏览原始摘要信息 |
|
点击此处可从《复合材料学报》下载全文 |
|
