Effect of sintering temperature on microstructure and properties of Co-Cr alloys fabricated by vat photopolymerization 3D printing technology

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-01-08 DOI:10.1016/j.jallcom.2025.178564

Huifang Yin, Wanqing Zheng, Shiyu Wang, Wei Li, Jiqing Zhao, Fengshi Yin, Li Zhou

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引用次数: 0

Abstract

In this study, dense and evenly microstructured Co-Cr alloy blocks were prepared for the first time by degreasing and sintering after vat photopolymerization three-dimensional (3D) printing, and the effect of sintering temperature on the alloy microstructure was investigated. The results showed that the Co-Cr alloy sintered at 1180 °C had a low density with many pores in its microstructure. Increasing the sintering temperature from 1200 °C to 1240 °C improved the density and uniformity of the microstructure, and the grain size in the Co-Cr alloy increased with an increasing sintering temperature. Furthermore, the carbon content of the Co-Cr alloy increased after sintering because of the breakage of C-C and C-H bonds in the binder, which also changed the types of phases formed in the Co-Cr alloy. After sintering at 1180 °C, the phases in the Co-Cr alloy were mainly γ(Co-fcc), ε (Co-hcp), σ, μ, and M₂₃C₆ carbides. With an increase in the temperature and carbon content, the phases in the Co-Cr alloy transformed to γ (Co-fcc), M₂₃C₆, M₇C₃, and M₆C. Additionally, the hardness of the Co-Cr alloy after sintering at 1180 °C was 493.5 ± 19.6 HV, which is lower than that of the samples sintered at 1200 °C (549.1 ± 14.8 HV), 1220 °C (542 ± 13.5 HV), and 1240 °C (547 ± 14.3 HV), whereas it changed slightly from 1200 to 1240 °C. The results reveal that the microstructure and properties of Co-Cr alloy blocks prepared by vat photopolymerization 3D printing technology are strongly related to degreasing and sintering processes.

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烧结温度对还原光聚合3D打印Co-Cr合金组织和性能的影响

本研究采用还原光聚合三维（3D）打印技术，通过脱脂和烧结制备了致密均匀的Co-Cr合金块体，并研究了烧结温度对合金微观组织的影响。结果表明：在1180℃下烧结的Co-Cr合金微观组织密度低，气孔较多；当烧结温度从1200℃提高到1240℃时，Co-Cr合金的组织密度和均匀性得到改善，随着烧结温度的升高，Co-Cr合金的晶粒尺寸增大。此外，烧结后Co-Cr合金的碳含量增加，因为粘结剂中的C-C键和C-H键断裂，这也改变了Co-Cr合金中形成的相类型。在1180℃烧结后，Co-Cr合金的相主要为γ(Co-fcc)、ε (Co-hcp)、σ、μ和M23C6碳化物。随着温度和碳含量的升高，Co-Cr合金中的相转变为γ (Co-fcc)、M23C6、M7C3和M6C。1180℃烧结后Co-Cr合金的硬度为493.5±19.6 HV，低于1200℃（549.1±14.8 HV）、1220℃（542±13.5 HV）和1240℃（547±14.3 HV）烧结后的硬度，而1200 ~ 1240℃烧结后的硬度变化不大。结果表明，还原光聚合3D打印技术制备的Co-Cr合金块体的组织和性能与脱脂和烧结工艺密切相关。

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

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.