The development and testing of a new method of qualitative analysis of the microstructure quality, for example of steel AISI 321 subjected to radial shear rolling
Abstract:The work is devoted to the problem of quantitative evaluation of the microstructure on the example of work with the TEM study of ultrafine-grained (UFG) austenitic steel for use in nuclear power. The material was obtained by radial-shear rolling and has different features of the structural structure of the cross section (from the periphery to the center), which makes it relevant to the correct assessment of the microstructure, taking into account all the features. This is difficult to do correctly, using only … Show more
“…Such a structure should provide an increase in operational properties, in particular, radiation resistance [ 12 , 13 , 14 , 15 ]. The resulting microstructure is in good agreement with the research data [ 6 , 7 , 18 , 19 , 20 , 23 , 24 ].…”
Section: Discussionsupporting
confidence: 88%
“…This mill was chosen for conducting experiments to study the effect of radial-shear rolling on the microstructure of zirconium, because the mill is characterized by a wide range and high rigidity of the cage and ease of operation. Previously, using a similar type of mill, an ultrafine structure with equiaxed grains of 300–700 nm was obtained on samples made of AISI-321 stainless austenitic steel, which is also widely used in nuclear power engineering [ 22 , 23 , 24 ].…”
An overview of the prospects for the development of nuclear technologies and the conclusion of the relevant requirements for advanced structural materials, their classification and features were performed. In order to obtain a bar with a modified radiation-resistant outer layer, an experiment of radial-shear rolling under the most stringent conditions was carried out. For the same conditions, a FEM-simulation of sequential rolling in eight passes with a total compression of 70.7% (from a diameter of 37 mm to 20 mm) was conducted. For adequate simulation results a new material database for Zr-1%Nb alloy using plastometry investigations was generated. An experimental obtaining of a gradient-modified structure with an ultrafine-grained (UFG) periphery and an elongated rolling texture in the center of the bar was performed.
“…Such a structure should provide an increase in operational properties, in particular, radiation resistance [ 12 , 13 , 14 , 15 ]. The resulting microstructure is in good agreement with the research data [ 6 , 7 , 18 , 19 , 20 , 23 , 24 ].…”
Section: Discussionsupporting
confidence: 88%
“…This mill was chosen for conducting experiments to study the effect of radial-shear rolling on the microstructure of zirconium, because the mill is characterized by a wide range and high rigidity of the cage and ease of operation. Previously, using a similar type of mill, an ultrafine structure with equiaxed grains of 300–700 nm was obtained on samples made of AISI-321 stainless austenitic steel, which is also widely used in nuclear power engineering [ 22 , 23 , 24 ].…”
An overview of the prospects for the development of nuclear technologies and the conclusion of the relevant requirements for advanced structural materials, their classification and features were performed. In order to obtain a bar with a modified radiation-resistant outer layer, an experiment of radial-shear rolling under the most stringent conditions was carried out. For the same conditions, a FEM-simulation of sequential rolling in eight passes with a total compression of 70.7% (from a diameter of 37 mm to 20 mm) was conducted. For adequate simulation results a new material database for Zr-1%Nb alloy using plastometry investigations was generated. An experimental obtaining of a gradient-modified structure with an ultrafine-grained (UFG) periphery and an elongated rolling texture in the center of the bar was performed.
“…The microstructure formation features of titanium and aluminum alloys rods after RSR were shown in [6,7]. Naizabekov et al [8] proposed a quality evaluation model of microstructure at RSP based on AISI 321 steel. The examples of successful application of RSR method for steels and titanium alloys are good known.…”
“…Galkin [19]. Recently, a significant change in the structure of conventional steels [20], stainless steels [21][22][23], aluminum-based alloys [24][25] and magnesium [26] has been successfully obtained by radial-shear rolling.…”
Section: Features Of Ultrafine-grained and Nanostructured Materials A...mentioning
An overview of the prospects for the development of nuclear technologies and the conclusion of the relevant requirements for advanced structural materials, their classification and features were described. In order to obtain a bar with a modified radiation-resistant outer layer, an experiment on radial-shear rolling of the Zr-1% Nb alloy in conditions favorable for the UFG structure formation was conducted. In the process of radial-shear rolling of round bars along the route 37 mm → 20 mm in diameters with a total deformation of ≈ 70 %, a microstructure of submicron size was obtained. The nature of the microstructure is equiaxed with mainly high-angle boundaries and large crystallographic misorientation of the grains that is the most promising from the point of view of radiation resistance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.