High-speed laser directed energy deposition of Ni60 on 38CrMoAl steel: Crack inhibition and microstructure performance modulation via inductive preheating

材料科学 微观结构 脉冲激光沉积 调制(音乐) 激光器 沉积(地质) 复合材料 冶金 光电子学 薄膜 纳米技术 光学 声学 物理 古生物学 生物 沉积物
作者
Pengfei Liu,Yang Cao,Dongsheng Wu,Dabin Zhang,Ninshu Ma,Zhuotao Hu,Haijun He
出处
期刊:Journal of materials research and technology [Elsevier BV]
卷期号:33: 7503-7517 被引量:8
标识
DOI:10.1016/j.jmrt.2024.11.070
摘要

To inhibit cracking and improve performance, Ni60 alloy layers were deposited on the 38CrMoAl steel substrate using an inductive preheating-assisted high-speed laser-directed energy deposition technique (IP-HS-LDED). The effects of the preheating temperature on the crack, element distribution, microstructure, and performance of the deposited layers were systematically investigated via experiment, finite element simulation, and theoretical analysis. The results revealed that substrate preheating reduced the residual stresses and amount of brittle and hard Cr 7 C 3 particles in the deposited layers, thereby eliminating cracks. The deposited layers were primarily composed of γ-Ni, Ni 3 B, Cr 7 C 3 , CrB, and ferrite. Compared with the deposited layer preheated to 500 °C, the size and content of Cr 7 C 3 -type carbides in the deposited layer preheated to 400 °C increased, thus the load transfer and dislocation strengthening effects were enhanced, and the hardness of the deposited layers increased by 72.6 HV. Because preheating to 400 °C produced aggregated and coarse Cr 7 C 3 carbides, the significant mechanical property difference between the carbides and the substrate caused a large stress concentration between them during friction wear, easily leading to crack formation and the further development of spalling and weakening of friction performance. Abrasive wear was the main wear mechanism of the deposited layers.
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