Investigation of Degree of Internal Defects Closure in Ingots at Forging Sergey Kargin 1,4(&) , Viktor Artiukh 2,4 , Vladlen Mazur 3,4 , Dmitriy Silka 3,4 , and Natalia Meller 4,5 1 Pryazovskyi State Technical University, Mariupol 87500, Ukraine vbudar1973@gmail.com 2 Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 St. Petersburg, Russia 3 LLC «Saint-Petersburg Electrotechnical Company», 196603 St. Petersburg, Russia 4 Moscow State University of Civil Engineering, Yaroslavskoye shosse 26, 129337 Moscow, Russia 5 Tyumen Industrial University, Volodarskogo Street 38, 625000 Tyumen, Russia Abstract. Study results of mechanism of internal (axial) defect closure in ingot at forging are shown depending on: form of head (peen), form of ingot, ingot feed and degree of reduction. Intensity of closing of axial defect was chosen as a numerical characteristic of the investigation objective during the factor experi- ment. Dependence is obtained that describes connection between the degree of axial defect closure inside ingot and the main technological parameters of forging. It is shown that the biggest influence on the degree of axial defects closure in ingots at forging has the tool shape and the degree of reduction. Keywords: Ingot Á Internal (axial) defect Á Reduction Á Dependence Á Forging Á Variation interval Á Ef ficiency 1 Introduction At forging, it is required to ensure high quality of metal, eliminate various defects and provide raise of metal mechanical properties as well as to produce forgings with necessary shape and dimensions. Elimination of internal defects is the main task for getting high quality forgings. Process of defects elimination happens in two stages: closure of defect prior to the moment when its two opposite walls are closed down and then welding of the closed down walls of the defect. The studies [1–6] show that internal defects closure in metal at plastic deformation depends on different factors, mainly on: shape of ingot, degree of deformation, value of relative feed and shape of tool. However, mechanism of defects closure at forging operations has not been fully investigated. For prediction of defects closure, it is necessary to possess data regarding © Springer Nature Switzerland AG 2020 V. Murgul and M. Pasetti (Eds.): EMMFT 2018, AISC 982, pp. 818–824, 2020. https://doi.org/10.1007/978-3-030-19756-8_78 vera.murgul@mail.ru