Applying nondestructive testing to quality control of additive manufactured parts

Алешин, Н. П.; Grigor’ev, M. V.; Shchipakov, N. A.; Прилуцкий, М. А.; Murashov, V. V.

doi:10.1134/s1061830916100028

Cited by 27 publications

(8 citation statements)

References 20 publications

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“…При разработке аддитивных технологий получения изделий из металлических сплавов и композиционных материалов более углублённое понимание формирования структуры и свойств достигается за счёт сочетания методов неразрушающего контроля и физикомеханических исследований [3].…”

Section: национальный исследовательский томский политехнический университет томскunclassified

Применение Методов Физико-Механических Исследований И Методов Неразрушающего Контроля При Разработке Аддитивных Технологий С Использованием Металлических Материалов

2021

Международная Конференция "Физическая Мезомеханика. Материалы С Многоуровневой Иерархически Организованной Структурой И Интелле

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Section: национальный исследовательский томский политехнический университет томскunclassified

Применение Методов Физико-Механических Исследований И Методов Неразрушающего Контроля При Разработке Аддитивных Технологий С Использованием Металлических Материалов

2021

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“…В то же время исследование порообразования при различных режимах работы 3D-принтера показывает, что возможно без дополнительной последующей обработки снизить пористость за счет подбора режимов [19]. В последнее время для исследования пористости в деталях, напечатанных с помощью АТ, применяют различные методы неразрушающего контроля [13,20]. Для неразрушающего контроля свойств напечатанных изделий из титановых сплавов нередко используют наноиндентирование.…”

Section: ведениеunclassified

Structural and mechanical properties of stainless steel formed under conditions of layer-by-layer fusion of a wire by an electron beam

Fedorov¹,

Рыгин²,

Клименов³

et al. 2021

Metal Working and Material Science

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Introduction. As of today, additive technologies are among the most promising methods to manufacture various parts. They allow producing parts of complex shapes and provide their quality structure. The quality of the structure formed depends on numerous parameters: equipment type, its operation mode, materials, shielding medium, etc. Large international companies producing 3D-printers provide technological guidelines for working on it. Such guidelines include the information on the manufacturers of raw materials (printing powders), products their equipment can work with and the operation modes that should be used with such powders. These parameters should be investigated to use it on the domestic equipment developed within the framework of research programs and import substitution programs. The researchers and developers of 3D-printing equipment frequently run into a problem of using currently available raw materials for obtaining parts possessing minimal porosity, uniform structure and mechanical properties similar to that of at least cast blanks. One of the widely used materials for 3D-printing is stainless steel. It has high corrosion resistance, which reduces the requirements to the medium in which 3D printing is carried out. Manufactured stainless steel products have a good combination of strength and plastic characteristics. The aim of the study is to obtain stainless steel specimens possessing minimal number of micro- and macro-defects and uniform structure by the method of wire arc additive manufacturing using an electron-beam setup developed at Tomsk Polytechnic University. The methods to study the AISI 308LSi stainless steel 3D-printed specimens are as follows: XRD analysis, tomography, chemical analysis, metallographic analysis, microhardness testing. Results and discussion. It is established that the AISI 308LSi stainless steel specimens manufactured using the electron-beam 3D-printing setup contain no macro-defects in the bulk of the specimens. There are small microdefects represented by residual gas pores with the dimensions of no more than 5.2 μm. The microstructure of the specimens is formed close to that of coarse-grained cast austenite steels and consists of columnar grains of the γ-Fe austenite matrix and high-temperature ferrite. The interfaces between the wire layers are not pronounced; however, there are small differences in phase composition. Based on the analysis of the results obtained, it is established that the use of electron-beam 3D-printing for the manufacture of parts from AISI 308LSi steel gives a structure similar to cast austenitic steels. Macro-defects do not appear, and the number of gas pores is small.

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“…Additive manufacturing (AM) technology arises at this environment [1][2]. SLM is a method of AM [3][4], and the mechanical properties of the parts produced can be comparable to the traditional casting parts [5].However, small defects will destroy the mechanical properties of the metal materials [6][7], resulting in the process being unable to continue and even the workpiece being scrapped [8][9][10].Therefore, it is particularly important to carry out quantitative and effective testing for AM products with nondestructive testing. At present, Nilsson [11] used ultrasonic eddy current and X-ray methods to detect the artificial defects of TC4 titanium alloy additive test blocks.…”

Section: Introductionmentioning

confidence: 99%

“…Antondu Plessis [12][13][14] applied X-ray microcomputed tomography in AM. Ziolkowski [15][16] used CT detections technology to detect the porosity, pore size and orientation of 316L stainless steel parts and Ti6Al4V sample made by laser selection melting. Noriyasu [17] used eddy current testing method to detect the defects of internal circular holes in additive manufacturing with stepped and sloping surfaces.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Imaging Detection of Additive Manufactured Parts Using Laser Ultrasonic Testing

et al. 2020

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Selective laser melting (SLM) is an important method of additive manufacturing, however it has some disadvantages such as poor surface qualities of the formed parts and the appearances of small surface defects. In this paper, 360L stainless steel with artificial defects in different lengths are processed by SLM processing. A full noncontact laser ultrasonic-based B-scan detection system is built to detect the surface defects. The interaction between the scattered surface wave and the surface defect is verified through 3-dimension (3D) finite element simulation. In order to improve the signal-to-noise ratio (SNR) of laser ultrasonic signal in AM 316L part, Variational Mode Decomposition (VMD) algorithm based particle swarm optimization (PSO) is applied to denoise signals. Meanwhile, wavelet transform (WT) algorithm is used to compare SNR with VMD algorithm. Then, the time and amplitude parameters of different positions are extracted to realize B-scan imaging, and the lengths of defects are further accurately quantified through the time-amplitude-position imaging images. Otherwise, we find that the size of laser spot affects the precise quantification of defects. The smaller the spot is, the more precise the quantitative effect is. The results show that this method can quantitatively detect surface defects of AM 316L parts.

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Applying nondestructive testing to quality control of additive manufactured parts

Cited by 27 publications

References 20 publications

Structural and mechanical properties of stainless steel formed under conditions of layer-by-layer fusion of a wire by an electron beam

Quantitative Imaging Detection of Additive Manufactured Parts Using Laser Ultrasonic Testing

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