Microstructure and Mechanical Properties of Cr3C2/CoCrMo Alloys Prepared by Selective Laser Melting

被引：1
作者：
Si Songhua [1 ,2 ]
Lei Jin [1 ,2 ]
Xu Zhenlin [2 ]
Zheng Mengqin [2 ]
Xia Pengfei [2 ]
机构：
[1] Anhui Univ Technol, Key Lab Green Fabricat & Surface Technol Adv Met, Maanshan 243002, Peoples R China
[2] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2023年 / 52卷 / 12期
关键词：
selective laser melting; CoCrMo alloys; Cr3C2; microstructure; mechanical properties; TRANSFORMATION; FRICTION; BEHAVIOR;
D O I：
10.12442/j.issn.1002-185X.20220914
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High-density CoCrMo and Cr3C2/CoCrMo alloys were prepared by selective laser melting (SLM). The effect of Cr3C2 particles on the microstructure, strength and wear resistance of the CoCrMo alloy were investigated. Results show that the phases of the alloy are gamma-Co and epsilon-Co, and the M23C6 phase is generated due to the addition of Cr3C2. The microstructures of both CoCrMo and Cr3C2/CoCrMo alloys consist of epitaxial columnar crystals and homogeneous cellular crystals, and the addition of Cr3C2 reduces the number of columnar crystals. The mechanical characteristics of the alloy specimens were tested. The hardness (HV) Cr3C2/CoCrMo specimens is (5037 +/- 176) MPa and ultimate tensile strength is 1520 MPa, which is 27% and 28% higher than that of CoCrMo specimens, respectively. Under the same load, the wear amount of Cr3C2/CoCrMo alloy is significantly less than that of CoCrMo alloy, and the wear resistance is improved by 30%. In the SLM process, the added Cr3C2 particles melt rapidly, and Cr generates a solid solution strengthening in the matrix; Cr3C2 transforms at the grain boundaries to generate M23C6-type carbides with precipitation strengthening, thus improving the strength and wear resistance of the alloy.
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收藏
页码：4212 / 4219
页数：8
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