Effects of Laser Melting Deposition Process Parameters on Ultrasonic Testing Accuracy of TA15 Titanium Alloy

Changjin, 孙长进 Sun; Jibin, 赵吉宾 Zhao; Yuhui, 赵宇辉 Zhao; Zhenfeng, 何振丰 He; Zhiguo, 王志国 Wang; Yuan, 高元 Gao

doi:10.3788/aos201939.1014002

Cited by 2 publications

(1 citation statement)

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“…Cerniglia et al demonstrated the efficiency of a laser ultrasonic system-based UT in characterizing near surface micro-defects in Inconel samples [6]. Sun et al studied the influence of processing parameter on the UT of AM TA15 alloy specimens with different internal micro-flaw sizes [7]. Although considerable work has been carried out to investigate the UT of internal flaws in AM metallic components, further efforts are still needed due to problems of conventional UT, such as poor signal to noise ratio (SNR), low accuracy, shallow detection depth and even inability.…”

Section: Introductionmentioning

confidence: 99%

Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Wang

et al. 2020

Mater. Res. Express

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While titanium components manufactured by additive manufacturing have been widely used in direct molding of complex components, their performance is strongly affected by existing internal flaws generated in the unique manufacturing process. Thus, how to efficiently and accurately characterize geometrical characteristics of internal flaws is critical for enhancing applications of additive manufactured titanium components. In the present work, an effective non-destructive method by using phased array ultrasonic testing is proposed to characterize sub-millimeter artificial deep bottom holes in additive manufactured TC18 titanium block. Specifically, a phased array ultrasonic testing platform integrated with total focusing method-based post-processing algorithm is established. Flat bottom holes with a diameter of 0.8 mm and a depth of 5.0 mm in 55 mm-sized cube titanium block are detected using both linear and annular array transducers. Experimental results show that preexisting holes can be characterized by both linear and annular transducers, in despite of accompanied high acoustic attenuation. Furthermore, the annular phased array ultrasonic testing has higher detection accuracy and resolution than the linear phased array one, for its stronger capability of sound field focusing. More importantly, the annular phased array ultrasonic testing shows similar high testing accuracy in different relative orientations between forming orientation of the titanium component and sound wave propagation direction. These findings provide an effective strategy for the non-destructive ultrasonic testing of titanium components by additive manufacturing.

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Section: Introductionmentioning

confidence: 99%

Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Wang

et al. 2020

Mater. Res. Express

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Effect of Gradient Layer Number on Microstructure and Property of Laser Deposition TA15/Ti₂AlNb Transition Zone

Ying-tong

Yang

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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3 numerical models of laser deposited TA15/Ti2AlNb gradient composite structure were established to simulate the temperature variation of gradient composite structures with different gradient layers in different regions. Then TA15/Ti2AlNb gradient composite structures with different gradient layers were prepared by laser deposition technology. The microstructure, room-temperature tensile properties and microhardness of the deposited samples were observed by optical microscope, tensile testing machine, scanning electron microscope and microhardness tester. The results showed that as the number of gradient layers increased, the temperature in the deposition process of the transition zone increased, while the microstructure difference in the transition zone decreased gradually. As the number of transition layers increased, the tensile strength decreased, but the elongation after fracture increased. All the fracture locations were in the transition zone, and with the increasing of gradient layers, the fracture location gradually shifted to the Ti2AlNb side. The microhardness of the transition zone increased with the increasing of gradient layers. This study will provide reference for the optimization design of TA15/Ti2AlNb gradient composite structure.

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Effects of Laser Melting Deposition Process Parameters on Ultrasonic Testing Accuracy of TA15 Titanium Alloy

Cited by 2 publications

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Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Effect of Gradient Layer Number on Microstructure and Property of Laser Deposition TA15/Ti₂AlNb Transition Zone

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Effects of Laser Melting Deposition Process Parameters on Ultrasonic Testing Accuracy of TA15 Titanium Alloy

Cited by 2 publications

References 0 publications

Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Phased array ultrasonic testing of micro-flaws in additive manufactured titanium block

Effect of Gradient Layer Number on Microstructure and Property of Laser Deposition TA15/Ti2AlNb Transition Zone

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Effect of Gradient Layer Number on Microstructure and Property of Laser Deposition TA15/Ti₂AlNb Transition Zone