Effects of inter-layer remelting frequency on the microstructure evolution and mechanical properties of equimolar CoCrFeNiMn high entropy alloys during in-situ powder-bed arc additive manufacturing (PBAAM) process

2022 ◽  
Author(s):  
Jun Wang ◽  
Yao Lu ◽  
Fanghui Jia ◽  
Wenzhen Xia ◽  
Fei Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Microstructure Evolution ◽  
High Entropy Alloys ◽  
Powder Bed ◽  
High Entropy

scholarly journals Additive Manufacturing of High-Entropy Alloys: A Review

Entropy ◽  
2018 ◽  
Vol 20 (12) ◽  
pp. 937 ◽  
Author(s):  
Shuying Chen ◽  
Yang Tong ◽  
Peter Liaw
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
High Efficiency ◽  
Mechanical Performance ◽  
Heating Temperature ◽  
Intermetallic Phase ◽  
Solid Solution Phase ◽  
High Entropy Alloys ◽  
Scanning Method ◽  
High Entropy

Owing to the reduced defects, low cost, and high efficiency, the additive manufacturing (AM) technique has attracted increasingly attention and has been applied in high-entropy alloys (HEAs) in recent years. It was found that AM-processed HEAs possess an optimized microstructure and improved mechanical properties. However, no report has been proposed to review the application of the AM method in preparing bulk HEAs. Hence, it is necessary to introduce AM-processed HEAs in terms of applications, microstructures, mechanical properties, and challenges to provide readers with fundamental understanding. Specifically, we reviewed (1) the application of AM methods in the fabrication of HEAs and (2) the post-heat treatment effect on the microstructural evolution and mechanical properties. Compared with the casting counterparts, AM-HEAs were found to have a superior yield strength and ductility as a consequence of the fine microstructure formed during the rapid solidification in the fabrication process. The post-treatment, such as high isostatic pressing (HIP), can further enhance their properties by removing the existing fabrication defects and residual stress in the AM-HEAs. Furthermore, the mechanical properties can be tuned by either reducing the pre-heating temperature to hinder the phase partitioning or modifying the composition of the HEA to stabilize the solid-solution phase or ductile intermetallic phase in AM materials. Moreover, the processing parameters, fabrication orientation, and scanning method can be optimized to further improve the mechanical performance of the as-built-HEAs.

Effect of Mo and Ni elements on microstructure evolution and mechanical properties of the CoFeNixVMoy high entropy alloys

2015 ◽  
Vol 649 ◽  
pp. 585-590 ◽  
Author(s):  
L. Jiang ◽  
Z.Q. Cao ◽  
J.C. Jie ◽  
J.J. Zhang ◽  
Y.P. Lu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
High Entropy Alloys ◽  
High Entropy

Additive manufacturing of high-entropy alloys by thermophysical calculations and in situ alloying

2021 ◽  
Author(s):  
Mehmet Cagirici ◽  
Pan Wang ◽  
Fern Lan Ng ◽  
Mui Ling Sharon Nai ◽  
Jun Ding ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Fabricating Homogeneous FeCoCrNi High-Entropy Alloys via SLM In Situ Alloying

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 942
Author(s):  
Yaqing Hou ◽  
Hang Su ◽  
Hao Zhang ◽  
Xuandong Wang ◽  
Changchang Wang
Keyword(s):  
Mechanical Properties ◽  
Selective Laser Melting ◽  
Traditional Method ◽  
Raw Material ◽  
Elemental Powder ◽  
High Entropy Alloys ◽  
Laser Melting ◽  
High Entropy ◽  
Powder Blend

Selective laser melting (SLM) in situ alloying is an effective way to design and fabricate novel materials in which the elemental powder is adopted as the raw material and micro-areas of elemental powder blend are alloyed synchronously in the forming process of selective laser melting (SLM). The pre-alloying process of preparation of raw material powder can be left out, and a batch of bulk samples can be prepared via the technology combined with quantitative powder mixing and feeding. The technique can be applied to high-throughput sample preparation to efficiently obtain a microstructure and performance data for material design. In the present work, bulk equiatomic FeCoCrNi high-entropy alloys with different processing parameters were fabricated via laser in situ alloying. Finite element simulation and CALPHAD calculation were used to determine the appropriate SLM and post-heating parameters. SEM (scanning electron microscope), EDS (energy dispersive spectroscopy), XRD (X-ray diffraction), and mechanical testing were used to characterize the composition, microstructure, and mechanical properties of as-printed and post-heat-treated samples. The experimental results show that the composition deviation of laser in situ alloying samples could be controlled within 20 wt %. The crystal structure of as-printed samples is a single-phase face-centered cubic (FCC), which is the same as those prepared by the traditional method. The mechanical properties of the samples prepared by laser in situ alloying with elemental powder blend are comparable to those prepared by pre-alloying powder and much higher than those prepared by the traditional method (arc melting). As-printed samples can get a homogeneous microstructure under the optimal laser in situ alloying process combined with post-heat treatment at 1200 °C for 20 h.

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