Heat Treatment Optimization of Laser Powder Bed Fusion Formed WC/18Ni300 Maraging Steel Composites

Shang, Xiaobiao; Fan, Huili; Yao, Bibo; Li, Zhenhua; Liu, Meihong; Teng, Baoren

doi:10.1007/s11837-024-06609-z

JOM

2024

DOI: 10.1007/s11837-024-06609-z

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Heat Treatment Optimization of Laser Powder Bed Fusion Formed WC/18Ni300 Maraging Steel Composites

Xiaobiao Shang,

Huili Fan,

Bibo Yao

et al.

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2024

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Cited by 2 publications

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Effect of Solution Aging Heat Treatment on Tribological Properties of Selective Laser Melted WC/18Ni300 Composite

Teng,

Fan,

Yao

et al. 2024

steel research int.

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Different contents of WC particle‐reinforced 18Ni300 composites are prepared by selective laser melting method, and the tribological properties are comparatively studied before and after solution aging heat treatment. The results show that a part of WC particles are dissolved, and no obvious pore defects appear. With the increase of WC content, the microstructure gradually transforms from cellular and fine columnar α‐Fe martensite to γ‐Fe austenite. After solution aging heat treatment, the phase is transformed into acicular martensite. The grain size significantly decreases, and the Vickers hardness increases. The grain size decreases and the hardness increases with increasing WC contents. For the as‐built composite, the friction coefficient first decreases and then increases, and the wear rate first increases and then decreases with the increase of WC content. With WC content increasing, the wear rate first decreases and then increases. After heat treatment, the tribological properties are improved. The groove of the specimens before heat treatment is deep with large delaminated craters, and the wear mechanism is dominated by adhesive and abrasive wear. The grooves become shallower, and the adhesive trace becomes lighter after heat treatment. The wear mechanism is mainly adhesive wear and abrasive wear, accompanying with oxidative wear.

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Effect of Solution Aging Heat Treatment on Tribological Properties of Selective Laser Melted WC/18Ni300 Composite

Teng,

Fan,

Yao

et al. 2024

steel research int.

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The Effect of Solution Aging on the Microstructure and Mechanical Properties of a Laser Powder Bed Fusion-Formed WC-Reinforced 18Ni300 Composite

Teng,

Yao,

et al. 2024

Metals

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The addition of WC particles has the potential to improve the properties of 18Ni300 alloy, but the effect of heat treatment on the microstructure and mechanical properties of 18Ni300 matrix composites needs to be further investigated. In this work, WC-reinforced 18Ni300 composites were fabricated using laser powder bed fusion (LPBF). The composites were made into solutions at 846 °C for 51 min, followed by aging at 388 °C for 300 min. The microstructural evolution and compressive properties of the composites before and after heat treatment were systematically studied. The results indicate that the microstructures of the composites consist of heterogeneous cellular and fine columnar grains. As the WC content increases, the primary phase in the LPBF-formed samples gradually shifts from α-Fe martensite to γ-Fe austenite. After heat treatment, the primary phase transforms to α-Fe with only a small residual amount of γ-Fe. The microstructure becomes more uniform, featuring a significant reduction in grain size. Many precipitated phases can be found in the intergranular, accompanied by an increase in the thickness of diffusion layers. The WC content in the composite material is positively correlated with its hardness and compressive strength. As the WC reinforcement content increases from 5% to 20%, the yield strength and compressive strength of the LPBF-formed composites increase to 1042.5 MPa and 2900.7 MPa, respectively, while the compressive elongation decreases from 64% to 43%. After heat treatment, the yield strength of the composites significantly increases to 2356.8 MPa, with a slight increase in the compressive strength to 2939.7 MPa. However, the elongation decreases from 32.5% to 22%.

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Heat Treatment Optimization of Laser Powder Bed Fusion Formed WC/18Ni300 Maraging Steel Composites

Cited by 2 publications

References 39 publications

Effect of Solution Aging Heat Treatment on Tribological Properties of Selective Laser Melted WC/18Ni300 Composite

Effect of Solution Aging Heat Treatment on Tribological Properties of Selective Laser Melted WC/18Ni300 Composite

The Effect of Solution Aging on the Microstructure and Mechanical Properties of a Laser Powder Bed Fusion-Formed WC-Reinforced 18Ni300 Composite

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