DIRECTIONAL CRYSTALLIZATION OF 316L STAINLESS STEEL SPECIMENS BY DIRECT LASER CLADDING
https://doi.org/10.26896/1028-6861-2018-84-1-I-29-35
Abstract
Advantages of direct laser cladding of metal consisting in the possibility of directional crystallization of 316L stainless steel samples are shown. Direct laser cladding of metal offers exciting possibilities for production of single crystal structures by directional crystallization of the deposited metal. The growth direction of dendritic crystals is driven by the thermal center determined by the position of the laser spot. We present a technique of manufacturing stainless steel products by direct laser deposition using the developed algorithm which allowed us to connect the movement of the robotic cell and turntable with a sample, laser switching and feeding of the gas powder mixture. The possibility of x-ray tomographic quality control of the obtained products, determination of the parameters of the laser spot on the substrate surface using high-speed photography, estimation of the phase composition of the deposited metal using x-ray diffraction analysis is demonstrated. The structure of obtained metal samples is represented by dendritic crystals oriented in the direction of the thermal center. The sample structure in the sample cross section is represented in the form of a honeycomb formed by the first order axes of dendritic crystals. It is shown that 200-мm thickness of the deposited layer in the central part of the sample does not interfere with the development of the dendritic structure and promotes the possibility of obtaining single- crystal structures free of pores and cracks. The possibility of estimating the inclination angle of dendritic crystals in the metal relative to the symmetry axis of the sample using a metallographic software package for analysis of digital images of the microstructures is shown. It is demonstrated that the roughness of the obtained samples is determined by the size of the powder particles and can be eliminated by the mechanical treatment.
References
1. Kablov E. N. Additive technologies — the dominant of the national technological initiative / Intellekt Tekhnol. 2015. N 2(11). P. 52 – 55 [in Russian].
2. Grigor’ev S. N., Smurov I. Yu. Prospects for the development of innovative additive production in Russia and abroad / Innovatsii. 2013. N 10. P. 76 – 82 [in Russian].
3. Kablov E. N. Strategic directions of development of materials and technologies for their processing for the period up to 2030 / Aviats. Mater. Tekhnol. 2012. N 5. P.7–17[inRussian].
4. Grigor’yants A. G., Shiganov I. N., Misyurov A. I. Technological processes of laser processing. — Moscow: Izd. MGTU im. N. Й. Baumana, 2006. — 664 p. [in Russian].
5. Turichin G., Zemlyakov E., Pozdeeva E., Tuominen Ya. Technological possibilities of laser surfacing using high-power fiber lasers / Metalloved. Termich. Obrab. Met. 2012. N 3. P. 35 – 40 [in Russian].
6. Gorynin I. V., Oryshchenko A. S., Malyshevskii V. A., Farmakovskii B. V., Kuznetsov P.A.Additive technologies on the basis of composite nanomaterials / Metalloved. Termich. Obrab. Met. 2014. N 10(712). P.4–8[inRussian].
7. Sova A., Grigoriev S., Okunkova A., Smurov I. Cold spray deposition of 316L stainless steel coatings on aluminium surface with following laser post-treatment / Surface and Coatings Technology. 2013. Vol. 235. P. 283 – 289.
8. Gorunov A. I. Creation of coatings and bulk products from a nickel-based material by the method of additive laser treatment / Metally. 2016. N 1. P. 101 – 105 [in Russian].
9. Gorunov A. I., Gilmutdinov A. Kh. Study of the effect of heat treatment on the structure and properties of the specimens obtained by the method of direct metal deposition / The International Journal of Advanced Manufacturing Technology. 2016. Vol. 86. Issue 9. P. 2567 – 2574.
10. Luo K., Jing X., Sheng J., Sun G., Yan Z., Lu J. Characterization and analyses on micro-hardness, residual stress and microstructure in laser cladding coating of 316L stainless steel subjected to massive LSP treatment / Journal of Alloys and Compounds. 2016. Vol. 673(15). P. 158 – 169.
11. Gorunov A. I., Gilmutdinov A. Kh. Investigation of coatings of austenitic steels produced by supersonic laser deposition / Optics & Laser Technology. 2017. Vol. 88. P. 157 – 160.
12. Peng G., Bin Z., Chuanzhen H., Huabing G. Study on microstructure, mechanical properties and machinability of efficiently additive manufactured AISI 316L stainless steel by high-power direct laser deposition / Journal of Materials Processing Technology. 2017. Vol. 240. P.12–22.
13. Kuznetsov P. A., Zisman A. A., Petrov S. N., Goncharov I. S. Structure and mechanical properties of 316L austenitic steel obtained by selective laser fusion / Deform. Razrush. Mater. 2016. N 4. P.9–13[inRussian].
14. Di W., Changhui S., Yongqiang Y., Yuchao B. Investigation of crystal growthmechanism during selective laser melting and mechanical property characterization of 316L stainless steel parts / Materials and Design. 2016. Vol. 100. P. 291 – 299.
15. Mingming M., Zemin W., Dengzhi W., Xiaoyan Z. Control of shape and performance for direct laser fabrication of precision large-scale metal parts with 316L Stainless Steel / Optics & Laser Technology. 2013. Vol. 45. P. 209 – 216.
16. A. s. 2016660262 RU. Program for controlling the process of growing metal products by an additive method in a laser welding setup / Gorunov A. I.; owner KAI (KNITU — KAI). — N 2016617644; appl. 09.09.2016; publ. 20.10.2016 [in Russian].
17. Gryaznov M. Yu., Shotin S. V., Chuvil’deev V. N. The effect of mesostructural hardening of 316L steel with layer-by-layer laser fusion / Vestn. Nizhegorod. Univ. im. N. I. Lobachevskogo. 2012. N 5(1). P. 45 – 50 [in Russian].
18. Gorunov A. I. Study of the influence of heat treatment on the structure and properties of samples obtained by direct laser deposition / Tsvet. Met. 2016. N 5(881). P. 69 – 74 [in Russian].
19. Yang L., Yongqiang Y., Shuzhen M., Di W., Changhui S. Investigation into spatter behavior during selective laser melting of AISI 316L stainless steel powder / Materials and Design 2015. Vol. 87. P. 797 – 806.
20. Gorunov A. I. Investigation of the structure and mechanical properties of a coating made of corrosion-resistant steel formed by the method of gas-dynamic spraying with activation of the process by laser radiation / Deform. Razrush. Mater. 2016. N 9. P.2–7[inRussian].
21. RF State Standard GOST 2789–73. Surface roughness. Parameters and characteristics. — Moscow: Standartinform, 2006.—7p.[inRussian].
Review
For citations:
Gorunov A.I. DIRECTIONAL CRYSTALLIZATION OF 316L STAINLESS STEEL SPECIMENS BY DIRECT LASER CLADDING. Industrial laboratory. Diagnostics of materials. 2018;84(1(I)):29-35. (In Russ.) https://doi.org/10.26896/1028-6861-2018-84-1-I-29-35
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