An exceptionally strong, ductile and impurity-tolerant austenitic stainless steel prepared by laser additive manufacturing

Chen, Yong; Zhu, Hongmei; Wang, Zhongchang; Wang, Meng; Sha, Gang; Lin, He; Ma, Jingyuan; Zhang, Zhenyuan; Song, Yong Won; Zheng, Pengfei; Zhou, Lihua; Li, Sheng; Líu, Hao; Shen, Longzhang; Qiu, Changjun

doi:10.1016/j.actamat.2023.118868

Cited by 12 publications

(2 citation statements)

References 60 publications

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“…Therefore, prepared coatings are modified via LMM technology to improve their chemical and mechanical properties. The LMM treatment allows the pre-positioned coating to remelt and bond with the substrate, significantly improving its film-base bonding and densification [18][19][20][21]. Numerous studies have indicated that laser power, scanning speed, and offset are the main process parameters affecting the quality of cladding coatings [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Laser Micromelting Process Parameters on the Preparation of Micron-Sized FeCrAl Coatings on Zr Alloy Surfaces

Song,

Wei,

Liu

et al. 2023

Materials

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Laser micromelting (LMM) technology allows for the remelting of pre-positioned coatings on the surface of a specimen to form a metallurgical bond with the substrate material, significantly improving the coating’s film–base bond. However, the high energy input from the laser modification process can cause severe element diffusion, rendering the coating susceptible to deformation and cracking. This can be mitigated by controlling the laser power, scanning speed, and offset of the LMM process. The temperature and stress fields of the samples in the LMM process were analyzed via finite element simulation. The effects of the LMM process parameters on the coating morphology were analyzed in conjunction with experiments. The results indicated that the laser power significantly affected the morphology of the coating after remelting, and a higher scanning speed was more likely to cause the coating to accumulate stress. Additionally, a smaller offset inhibited crack generation. At a laser power of 30 W, a scanning speed of 1200 mm/min, and a scanning spacing of 0.035 mm, the surface of the coating had no obvious defects and was relatively flat, and the adhesion and corrosion resistance were significantly improved. This study provides valuable guidance for improving the preparation of micron-sized protective coatings on Zr alloy surfaces.

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Section: Introductionmentioning

confidence: 99%

Effects of the Laser Micromelting Process Parameters on the Preparation of Micron-Sized FeCrAl Coatings on Zr Alloy Surfaces

Song,

Wei,

Liu

et al. 2023

Materials

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“…When the dislocation plugging reaches a certain level, the stress concentration causes the dislocations to break through the grain boundaries. Plastic deformation or cracking can occur because of the massive accumulation of dislocations [15][16][17][18]. Molecular dynamics relies on Newtonian mechanics to simulate the motion of molecular systems, combining theoretical methods and computer technology to obtain the evolution of the microstructure during the formation of material.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology

Song,

Wei,

Shuai

et al. 2023

Materials

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Micron-sized coatings prepared using physical vapor deposition (PVD) technology can peel off in extreme environments because of their low adhesion. Laser micro-melting (LMM) technology can improve the properties of the fabricated integrated material due to its metallurgical combinations. However, the microstructural changes induced by the high-energy laser beam during the LMM process have not been investigated. In this study, we used the PVD–LMM technique to prepare NiCr coatings with a controlled thickness. The microstructural changes in the NiCr alloy coatings during melting and cooling crystallization were analyzed using molecular dynamics simulations. The simulation results demonstrated that the transition range of the atoms in the LMM process fluctuated synchronously with the temperature, and the hexagonal close-packed (HCP) structure increased. After the cooling crystallization, the perfect dislocations of the face-centered cubic (FCC) structure decreased significantly. The dislocation lines were mainly 1/6 <112> imperfect dislocations, and the dislocation density increased by 107.7%. The dislocations in the twinning region were affected by the twin boundaries and slip surfaces. They were plugged in their vicinity, resulting in a considerably higher dislocation density than in the other regions, and the material hardness increased significantly. This new technique may be important for the technological improvement of protective coatings on Zr alloy surfaces.

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Additively Manufactured Stainless Steel Wind Tunnel Model Support Featuring Honeycomb Structures for Vibration Attenuation

Fu,

Peng,

Zhang

et al. 2024

Adv Eng Mater

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Wind tunnel model support (WTMS) is an indispensable component of wind tunnel testing. However, the presence of vibrations within the model‐support system can compromise the accuracy of data and give rise to significant safety hazards. In this study, an approach for vibration attenuation by incorporating honeycomb structures into the design of the WTMS is proposed. To this end, stainless steel WTMSs with integrated honeycomb structures are fabricated by selective laser melting (SLM). Results showed that stainless steels prepared under optimized SLM processing parameters exhibit high crystallinity and consist of single‐phase Fe–Cr–Ni alloy. The stainless steels exhibited robust mechanical properties, including a tensile strength of ≈1 GPa, an elongation of ≈8%, and a compressive strength of ≈1.4 GPa. These exceptional mechanical properties can be attributed to the formation of a cellular structure and tangled dislocations. The first‐order and the third‐order resonant response of WTMS honeycomb structures can be effectively reduced. The vibration reduction mechanism can be attributed to the occurrence of local resonance when the natural frequency of the internal periodic unit of the WTMS closely matched the vibration frequency of the model. The utilization of honeycomb structures holds significant potential for achieving vibration attenuation in WTMS.

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An exceptionally strong, ductile and impurity-tolerant austenitic stainless steel prepared by laser additive manufacturing

Cited by 12 publications

References 60 publications

Effects of the Laser Micromelting Process Parameters on the Preparation of Micron-Sized FeCrAl Coatings on Zr Alloy Surfaces

Effects of the Laser Micromelting Process Parameters on the Preparation of Micron-Sized FeCrAl Coatings on Zr Alloy Surfaces

Investigation of the Dislocation Density of NiCr Coatings Prepared Using PVD–LMM Technology

Additively Manufactured Stainless Steel Wind Tunnel Model Support Featuring Honeycomb Structures for Vibration Attenuation

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