Effects of pre-heating induced interfacial diffusion on microstructure and related mechanical properties of direct laser metal deposited Inconel 625 superalloy on a Cu-Cr-Zr substrate

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2024-11-14 DOI:10.1016/j.msea.2024.147551

Ruohan Zhao, Lulu Li, Zhenhua Nie, Zongqing Ma, Qianying Guo

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Abstract

Copper-based alloys possess outstanding thermal and electrical conductivity, making them popular in the electronic and aerospace industries. However, its low hardness makes it vulnerable to failure in harsh service environments, which require surface coating. By using the direct laser metal deposition method to coat harder alloys on the surface of Cu alloys, the challenge of this copper alloy's high laser reflectivity was noted. To solve this problem, both substrate preheating and high-power LMD methods were employed, which established an excellent metallurgical bonding between the coating and substrate with a 2 μm diffusion layer and enhanced the Cu-Cr-Zr substrate's hardness and wear resistance. Due to the presence of copper elements in the fusion zone, the constituent supercooling zone is increased, resulting in a finer columnar crystal structure in the fusion zone. Such elements exchange process during LMD produces will also improve the mechanical properties of the Cu-Cr-Zr substrate by solid solution strengthening.

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预热诱导的界面扩散对 Cu-Cr-Zr 基底上直接激光金属沉积 Inconel 625 超合金的微观结构和相关机械性能的影响

铜基合金具有出色的导热性和导电性，因此在电子和航空航天工业中很受欢迎。然而，由于硬度较低，在恶劣的使用环境中容易发生故障，因此需要进行表面涂层处理。通过使用直接激光金属沉积法在铜合金表面涂覆硬度更高的合金，人们注意到了这种铜合金的高激光反射率所带来的挑战。为了解决这个问题，我们采用了基底预热和高功率 LMD 两种方法，在涂层和基底之间形成了 2 μm 的扩散层，形成了良好的冶金结合，提高了 Cu-Cr-Zr 基底的硬度和耐磨性。由于熔合区中铜元素的存在，成分过冷区增大，从而使熔合区的柱状晶结构更加精细。LMD 生产过程中的这种元素交换过程还将通过固溶强化来改善 Cu-Cr-Zr 基材的机械性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.