Microstructure evolution and high temperature resistance of Ti6Al4V/Inconel625 gradient coating fabricated by laser melting deposition

被引：40
作者：
Sun, Zhonggang [1 ]
Ji, Xiao [1 ]
Zhang, Wenshu [1 ]
Chang, Lili [2 ]
Xie, Guoliang [3 ]
Chang, Hui [1 ]
Zhou, Lian [1 ]
机构：
[1] Nanjing Tech Univ, Coll Mat Sci & Technol, Tech Inst Adv Mat, Nanjing 210009, Peoples R China
[2] Nanjing Zhongke Raycham Laser Technol Co Ltd, Nanjing 210009, Jiangsu, Peoples R China
[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
MATERIALS & DESIGN | 2020年 / 191卷
基金：
中国国家自然科学基金;
关键词：
Laser melting deposition; Gradient coating; High temperature resistant; Titanium alloy; Nickel-based alloy; FUNCTIONALLY GRADED MATERIAL; 304L STAINLESS-STEEL; MECHANICAL-PROPERTIES; PHASE; TI-5AL-5MO-5V-1CR-1FE; TI-6AL-4V; PROPERTY;
D O I：
10.1016/j.matdes.2020.108644
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High temperature resistant coating is becoming a key technique to improve the heat resistance of aerospace heat-resistant components. In this paper, Ti6Al4V/Inconel625 gradient coating was fabricated by laser melting deposition. The results show that the microstructure changes with composition gradient, from lamellar structure consisting of lamellar a and beta phases to equiaxed structure. With the increase of the proportion for nickel-based alloy, alloying elements and concentration of solute increase in molten pool. Furthermore, the nucleation rate increases due to the increase of alloying elements, which leads to the microstructure refinement. The phase composition of gradient coating changes in the sequence of alpha + beta -> alpha + beta + Ti2Ni -> Ti2Ni + beta -> Ti2Ni + CrNi2 + gamma-Ni. The hardness of gradient coating increases as the relative percentage of Inconel625 correspondingly. When the relative percentage of nickel-based alloy reaches 100%, the hardness reaches a peak of 855 HV1. The hardness is attributed to the contribution from the formation of Ti2Ni precipitates, CrNi2 compounds as well as the solid solution hardening. For the high temperature properties, there is a diffusion zone at the interface between Ti6Al4V base layer and transition layer. The transverse microcracks are produced between layers at 800 degrees C. (C) 2020 The Authors. Published by Elsevier Ltd.
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页数：13
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