Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

Kim, Hoyeol; Liu, Zhichao; Cong, Weilong; Zhang, Hongchao

doi:10.3390/ma10111283

Cited by 28 publications

(14 citation statements)

References 75 publications

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“…Stress concentration will distribute around these small QR pixels, i.e. voids, and they can easily lead to the 3D printed component fracture under high static/dynamic loading or fatigue failure due to cyclical stress after long working period [20][21][22]. It is notable that the density requirement of the 3D printed metal component used in the aerospace industry is close to 100%.…”

Section: Reviewermentioning

confidence: 99%

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Wei

Sun

Huang

et al. 2018

Additive Manufacturing

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Section: Reviewermentioning

confidence: 99%

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Wei

Sun

Huang

et al. 2018

Additive Manufacturing

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“…On the one hand, when steel is used for mold and die (especially high carbon steel), it is difficult to deposit many layers on conventional manufacturing substrate without defects, as it is an alloy with high levels of hardness. Simultaneously, the LMD process offers the capability of depositing diverse material, such as interlayer materials [9] and functionally gradient materials [10,11]. This characteristic can be utilized to build dense deposition layers on existing substrate without cracks.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate

et al. 2020

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The combination of additive manufacturing and conventional metal forming processes provides the possibility for improvements of forming efficiency and flexibility. Substrate preheating is an implementable technique to improve the interface adhesion properties of the hybrid forming method. The present experiment investigates the adhesion of additive manufactured 316 L steel on P20 and 1045 steel substrates under two substrate temperatures, and the geometrical characterization, interfacial microstructure and mechanical property of the hybrid specimens were compared. As a result, it was found that the ratio of deposition height to the width was reduced and the width was increased under substrate preheating. Tensile results show that the ultimate strength of 1045 and 316 L hybrid specimens was obviously increased, while the properties of hybrid specimens P20 and 316 L were similar, under different substrate temperature conditions. For the hybrid specimens with the metallurgically bonding characteristic, the tensile properties can reach the level of 316 L depositioned specimens fabricated by laser metal deposition (LMD). Furthermore, substrate preheating had little effect on the microstructure of the laser metal deposition zone, and significant influence on the microstructure of the heat affected zone, which was reflected in the difference of the hardness distribution.

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“…Many test results showed that satisfactory mechanical properties, such as yield strength (YS), ultimate strength (UTS), and hardness can be obtained by laser additive manufacturing for various types of steels [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Many valuable results have been obtained in Cr-Ni-Mo steel via laser additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

et al. 2018

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Laser forming repair (LFR) technology has considerable potential in high strength steel structure repair. 34CrNiMo6 steel has been widely used in high-value components, and it is imperative to repair these damaged components. In this study, two different thicknesses of repaired layers are deposited on the 34CrNiMo6 wrought substrate with five layers and 20 layers via LFR technology. The microstructure, phases, microhardness, and tribological properties are analyzed using optical microscopy, scanning electron microscopy, X-ray diffraction, Vickers hardness testing, and dry sliding wear testing. These results show that the 34CrNiMo6 repaired layers were successfully deposited on the substrate. The microstructure of the laser-repaired layers in the five-layer sample included bainite and retained austenite. For the 20-layer sample, the microstructure in the top of the repaired layers was still bainite and retained austenite, whereas that in the bottom of the repaired layers was transformed into ferrite and cementite. The average coefficients of friction of repaired layers is not significantly different from the substrate. The wear rate of the five LFR layers, 20-layer LFR, and substrate samples were 12.89 × 10−6, 15 × 10−6, and 23.87 × 10−6 mm3/N·m, respectively. The laser forming repaired samples had better wear resistance compared to the substrate. The wear mechanism of laser forming repaired samples is abrasive wear; whereas that of the substrate is abrasive wear and fatigue wear.

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Tensile Fracture Behavior and Failure Mechanism of Additively-Manufactured AISI 4140 Low Alloy Steel by Laser Engineered Net Shaping

Cited by 28 publications

References 75 publications

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Embedding anti-counterfeiting features in metallic components via multiple material additive manufacturing

Comparison of Substrate Preheating on Mechanical and Microstructural Properties of Hybrid Specimens Fabricated by Laser Metal Deposition 316 L with Different Wrought Steel Substrate

Microstructure and Tribological Properties of Laser Forming Repaired 34CrNiMo6 Steel

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