Diagnostics, Resource and Mechanics of materials and structures最新文献_第9页

Studying the chemical and phase compositions of a chromium-nickel-manganese steel after operation at elevated temperatures in corrosive environments 研究了铬镍锰钢在腐蚀环境中高温作用后的化学成分和相组成

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-06-01 DOI: 10.17804/2410-9908.2021.3.017-030

N. B. Pugacheva, B. Guzanov

{"title":"Studying the chemical and phase compositions of a chromium-nickel-manganese steel after operation at elevated temperatures in corrosive environments","authors":"N. B. Pugacheva, B. Guzanov","doi":"10.17804/2410-9908.2021.3.017-030","DOIUrl":"https://doi.org/10.17804/2410-9908.2021.3.017-030","url":null,"abstract":"In recent years, chromium-nickel-manganese corrosion-resistant steels have been widely used in construction for the manufacture of stair railings and fences, elevators, and heat exchangers used for heat recovery in office premises and in production, including in metallurgical workshops. The purpose of this study is to determine the changes in the chemical and phase compositions of the 12Cr15Mn9NiCu corrosion-resistant steel (Russian analogue of the AISI 201 steel) after commercial operation in structural components of the heat exchanger of a metallurgical workshop. It was found that, during operation, all the studied fragments of the 12Cr15Mn2NiCu steel heat exchanger underwent intense oxidation with the formation of chromium and manganese oxides both on the surface and along the boundaries of the austenite grain. Diffusive penetration of sulfur into the steel with the formation of MnS particles, as well as carbonization of the surface layers, was recorded. As a result, the content of chromium and manganese in the steel significantly decreased, the amount of carbon increased, and the structure changed from austenitic to martensitic with a hardness of 532 HV 5 (48 HRC). Several investigated fragments retained austenite with oxidized grain boundaries. The austenite grain size ranged from 0.031 mm to 0.088 mm, with hardness ranging from 156 to 212 HV 5. It is shown that the use of the 12Cr15Mn9NiCu corrosion-resistant chromium-nickel-manganese steel intended for the manufacture of heat exchangers for metallurgical production is extremely inappropriate.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73940185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Information and analytical tools for assessing the structural survivability and safety of technological equipment 用于评估技术设备结构生存能力和安全性的信息和分析工具

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-06-01 DOI: 10.17804/2410-9908.2021.4.050-061

E. M. Reizmunt, S. Doronin, E. Moskvichev

{"title":"Information and analytical tools for assessing the structural survivability and safety of technological equipment","authors":"E. M. Reizmunt, S. Doronin, E. Moskvichev","doi":"10.17804/2410-9908.2021.4.050-061","DOIUrl":"https://doi.org/10.17804/2410-9908.2021.4.050-061","url":null,"abstract":"The tasks of information and computational support for the analysis of the survivability and safety of power shells of technical objects are formulated, aimed at studying their properties taking into account damages and abnormal effects. To solve them, algorithms and computational tools have been developed, aimed at analyzing damage and assessing the risk of re-occurrence of accidents at technical objects, modeling the structural and mechanical heterogeneity of welded joints and calculating their crack resistance, parametric modeling of welded joints with defects, analyzing the sensitivity of structures to defects, damages, and off-design effects, and evaluating their survivability and safety. Information support has been developed, which contains a systematic list of factors reducing survivability and safety, the results of experimental studies of the crack resistance of welded joints and the survivability of shells with a developing macrocrack, as well as the accumulated results of solving model and applied problems on analyzing the properties of damaged shell structures, as reference data.","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84271707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neutron studies of the V-4Ti-4Cr alloy V-4Ti-4Cr合金的中子研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-06-01 DOI: 10.17804/2410-9908.2021.3.031-044

S. Bogdanov, I. F. Berger, V. Bobrovskii, V. Voronin, V. D. Parkhomenko, V. Chernov

引用次数: 0

Analytical study of the Ekman angle for the Benard–Marangoni convective flow of viscous incompressible fluid 粘性不可压缩流体Benard-Marangoni对流的Ekman角分析研究

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-06-01 DOI: 10.17804/2410-9908.2021.4.34-49

A. Gorshkov, E. Prosviryakov

引用次数: 0

Gravitational principle of minimum pressure for incompressible flows 不可压缩流体最小压力的重力原理

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-04-01 DOI: 10.17804/2410-9908.2021.2.022-029

E. Prosviryakov

引用次数: 0

Erosion resistance of a combined multilayer coating protecting critical parts of modern gas turbine engines 现代燃气涡轮发动机关键部件复合多层涂层的抗侵蚀性能

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-04-01 DOI: 10.17804/2410-9908.2021.2.006-021

B. Guzanov, N. B. Pugacheva, T. Bykova

引用次数: 0

An extremum problem for a linear integro-differential system describing creeping flows of a viscoelastic fluid 描述粘弹性流体蠕变流动的线性积分-微分系统的极值问题

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-04-01 DOI: 10.17804/2410-9908.2021.2.052-063

M. A. Artemov, E. Baranovskii

引用次数: 0

Exact solutions of the Navier–Stokes equations for describing an isobaric one-directional vertical vortex flow of a fluid 描述流体等压单向垂直涡旋流动的Navier-Stokes方程的精确解

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-04-01 DOI: 10.17804/2410-9908.2021.2.030-051

N. Burmasheva, E. Prosviryakov

{"title":"Exact solutions of the Navier–Stokes equations for describing an isobaric one-directional vertical vortex flow of a fluid","authors":"N. Burmasheva, E. Prosviryakov","doi":"10.17804/2410-9908.2021.2.030-051","DOIUrl":"https://doi.org/10.17804/2410-9908.2021.2.030-051","url":null,"abstract":"The article proposes a family of exact solutions to the Navier–Stokes equations for describing isobaric inhomogeneous unidirectional fluid motions. Due to the incompressibility equation, the velocity of the inhomogeneous Couette flow depends on two coordinates and time. The expression for the velocity field has a wide functional arbitrariness. This exact solution is obtained by the method of separation of variables, and both algebraic operations (additivity and multiplicativity) are used to substantiate the importance of modifying the classical Couette flow. The article contains extensive bibliographic information that makes it possible to trace a change in the exact Couette solution for various areas of the hydrodynamics of a Newtonian incompressible fluid. The fluid flow is described by a polynomial depending on one variable (horizontal coordinate). The coefficients of the polynomial functionally depend on the second (vertical) coordinate and time; they are determined by a chain of the simplest homogeneous and inhomogeneous partial differential parabolic-type equations. The chain of equations is obtained by the method of undetermined coefficients after substituting the exact solution into the Navier–Stokes equation. An algorithm for integrating a system of ordinary differential equations for studying the steady motion of a viscous fluid is presented. In this case, all the functions defining velocity are polynomials. It is shown that the topology of the vorticity vector and shear stresses has a complex structure even without convective mixing (creeping flow).","PeriodicalId":11165,"journal":{"name":"Diagnostics, Resource and Mechanics of materials and structures","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79313363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Selection of complex equivalent stress for two different variants of the plane stress state 选取两种不同平面应力状态的复合等效应力

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-04-01 DOI: 10.17804/2410-9908.2020.2.064-072

V. Nazarov

引用次数: 0

On one problem of determining the optimal residual stress field 关于确定最优残余应力场的一个问题

Diagnostics, Resource and Mechanics of materials and structures Pub Date : 2021-02-01 DOI: 10.17804/2410-9908.2021.1.055-063

V. V. Struzhanov

引用次数: 0