Microstructural evolution and high temperature resistance of functionally graded material Ti-6Al-4V/Inconel 718 coated by directed Chock for energy deposition-laser
Microstructural evolution and high temperature resistance of functionally graded material Ti-6Al-4V/Inconel 718 coated by directed Chock for energy deposition-laser
复制标题
定向能沉积激光涂层功能梯度材料Ti-6Al-4V/Inconel 718的微观结构演变及耐高温性能
DOI：
10.1016/j.jallcom.2020.156255
复制
发表时间：
2020-12-25
影响因子：
6.2
通讯作者：
Chang, Hui
中科院分区：
文献类型：
--
作者：
Ji, Shuwei;Sun, Zhonggang;Chang, Hui
采用定向能量沉积-激光（DED-L）技术对Ti-6Al-4V/Inconel 718功能梯度材料进行增材制造。研究了显微组织演变、相特征、显微硬度变化和高温性能。随着Inconel 718比例的逐渐增加，合金元素（Ni、Cr、Fe等）添加的第二相（Ti 2Ni、TiNi等）。沉淀。显微组织由柱状晶向等轴晶转变。随着Inconel 718含量的增加，合金发生了一系列的相变，其顺序为：α + β-> α + β + Ti 2Ni-> 13+TiNi -> γ +Laves。在800 ℃暴露后，显微组织发生转变，并且在Ti-6Al-4V和过渡层之间形成Ti-Ni扩散区。涂层的显微硬度随着Inconel 718含量的增加而增加。当Inconel 718沉积结束时，涂层的显微硬度达到最高值为1030 HV 1，这归因于Ti 2Ni，TiNi等的形成和析出。显微硬度，显微组织和相变结果也与计算结果获得的相图基本一致。研究结果为用DED-L研究功能梯度材料涂层提供了一种实验分析与计算相图相结合的新方法。(C)2020爱思唯尔B. V.保留所有权利。
This work focuses on the additive manufacturing of Ti-6Al-4V/Inconel 718 functionally graded material coated by directed energy deposition-laser (DED-L). The microstructural evolution, phase characteristics, microhardness change, and high-temperature resistance were investigated. With Inconel 718 proportion increase gradually, more alloying elements (Ni, Cr, Fe etc.) were added and the secondary phase (Ti2Ni, TiNi, etc.) precipitated. The microstructure was found to transform from columnar grain to equiaxial grain. A series of phase transformation with the increase of Inconel 718 occurred in the following sequence: alpha+beta ->alpha+beta+Ti2Ni -> 13+TiNi ->gamma+Laves which were evidenced by experimental analysis and computational results. The microstructure is transformed and a Ti-Ni diffusion zone formed between the Ti-6Al-4V and transition layers after 800 degrees C exposure. The microhardness of the functionally graded material coating increases with the percentage of Inconel 718 increase. When the 100% of Inconel 718 deposited at the end, the microhardness of the layer reaches the highest value as 1030 HV1, which is attributed to the formation and precipitation of Ti2Ni, TiNi etc. The microhardness, microstructure, and phase transformation results are also generally consistent with the phase diagrams obtained from computational results. The results provide an innovative method which combines experimental analysis with computational phase diagram to research functionally graded material coating by DED-L. (C) 2020 Elsevier B.V. All rights reserved.