Corrosion crack resistance of structural materials: The state and prospects for the development of investigations

1985 ◽  
Vol 20 (5) ◽  
pp. 410-419
Author(s):  
L. V. Ratych
Keyword(s):  
Crack Resistance ◽  
Structural Materials ◽  
The State ◽  
Corrosion Crack Resistance

Thermodynamics of Solid-Phase Exchange Reactions Limiting the Subsolidus Structure of the System MgO-Al2O3-FeO-TiO2

2021 ◽  
Vol 1038 ◽  
pp. 177-184
Author(s):  
Oksana Borisenko ◽  
Sergey Logvinkov ◽  
Galina Shabanova ◽  
Oksana Myrgorod
Keyword(s):  
Materials Science ◽  
Solid Phase ◽  
Structural Materials ◽  
The State ◽  
Cement Clinker ◽  
Multicomponent Systems ◽  
Exchange Reactions ◽  
Chemical Corrosion ◽  
Physicochemical Basis ◽  
Rotary Kilns

The basis of modern materials science is multicomponent systems, on their basis it is possible to create various combinations of phases in structural materials with a set of specified properties. The investigated system MgO-Al2O3-FeO-TiO2 is promising for the production of periclase-spinel refractories used as lining of rotary kilns during cement clinker firing, which are highly resistant to chemical corrosion when exposed to a gas environment and cement clinker components; thermomechanical stresses. However, in the reference literature and scientific articles, no information was found on the structure of the four-component diagram of the state of the MgO-Al2O3-FeO-TiO2 system, partial elements of its structure are given only in the composition of multicomponent systems [1-3]. Thus, research to the study of the subsolidus structure of the MgO-Al2O3-FeO-TiO2 system, which is the physicochemical basis for the development of compositions of periclase-spinel refractories, is urgent.

Two features in rating the corrosion crack resistance of constructional alloys

1982 ◽  
Vol 18 (1) ◽  
pp. 30-40 ◽  
Author(s):  
O. N. Romaniv ◽  
G. N. Nikiforchin ◽  
A. Z. Student ◽  
A. T. Tsirul'nik
Keyword(s):  
Crack Resistance ◽  
Corrosion Crack Resistance

scholarly journals EVALUATION OF CHARACTERISTICS OF RESISTANCE OF PROPAGATION OF CORROSION- FATIGUE CRACKS OF LONG-TERM OPERATED DRILL PIPES

2021 ◽  
pp. 111-122
Author(s):  
О. Yu. Vytyaz ◽  
R. S. Hrabovskyi
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance ◽  
Corrosion Fatigue ◽  
Fatigue Cracks ◽  
Drill String ◽  
Drilling Mud ◽  
Corrosion Fatigue Crack ◽  
Corrosion Crack Resistance ◽  
Fatigue Crack Development

The aim of the proposed article is to determine the patterns of the corrosion-fatigue cracks in long-term operational metal elements of drill strings (steel 45, 36G2S, 40HN) when drilling wells in corrosive environments (drilling fluid "Biocar", potassium polymer mud and on the air). Based on the obtained results of experimental studies, diagrams of cyclic corrosion crack resistance for the studied systems "metal - medium" were drawn. The cyclic crack resistance characteristics of long-used metals of drill string elements are determined - the values of constants (C and n) in power dependence of Paris, as well as the values of threshold and critical stress intensity factory. The influence of drilling mud of the corrosion crack resistance of the investigated metals of drill string elements was estimated quantitatively. In particular, in the environment of drilling mud "Biocar" the process of corrosion-fatigue crack development in the studied metals of the elements of drill strings is not significantly, in the range of 1-5%, differs from the development of fatigue crack on the air. Whereas in the potassium polymer drilling mud media, the rate of corrosion-fatigue cracks development in the investigated metals of the drill strings elements significantly, in the range of 15-35%, differs from the development of fatigue cracks on the air. It is established that under the influence of working loads the process of the corrosion-fatigue crack development in long-operated elements of drilling string is accelerated by more than 10% in the media of the potassium polymeric drilling mud than in the environment of drilling mud "Biocar".

scholarly journals Assessment of the Current State of Internal Force and the Optimization of Cable Force for an Existing Long-span Pre-Stressed Concrete (PC) Cable-stayed Bridge

2017 ◽  
Vol 11 (1) ◽  
pp. 572-585 ◽  
Author(s):  
Xijun Ye ◽  
Zhuo Sun ◽  
Guoqing Huang
Keyword(s):  
Crack Resistance ◽  
Internal Force ◽  
The State ◽  
Geometric Shape ◽  
Natural Material ◽  
Cable Stayed Bridge ◽  
Cable Force ◽  
Resistance Value

Introduction: Due to the influence of load, fatigue, corrosion, natural material aging and other long-term adverse factors, the state of the internal force of a cable-stayed bridge will be changed. These long-term effects can result in the bridge not meeting specified functional requirements, and potentially resulting in structural failure. This investigation focuses on the parameter identification of a girder for a pre-stressed concrete (PC) cable-stayed bridge. Without considering the influence of cable relaxation and temperature on the girder’s geometric shape, an improved method based on the “cable force-girder’s displacement” relationship is proposed. Method: In this method, measurement variations of displacement and cable force are simultaneously obtained, enabling the use of an optimization method to identify parameters which need to be resolved. To verify the proposed method, a single pylon PC cable stayed bridge (2×160m) is selected as a case study. For the state of internal force, results from the case study bridge indicate that the crack resistance value of the girder no longer satisfies the demand of Generalized codes for design of highway bridges and culverts(JTG D60-2004,in Chinese). In order to adjust the internal force, cable force optimization was undertaken, whereby bending energy was taken as the objective function. Result: Using these results the geometric shape of the girder was restored to its initial state. The results also show that neither the crack resistance value nor the compression resistance value of the girder exceeded specified limits, and that the stress of the girder was effectively controlled.

High-temperature and cyclic corrosion crack resistance of alloys of the Ti-Si-Al-Zr system

2006 ◽  
Vol 42 (3) ◽  
pp. 330-343
Author(s):  
O. P. Ostash ◽  
A. D. Ivasyshyn ◽  
B. D. Vasyliv ◽  
I. Yu. Okun’
Keyword(s):  
High Temperature ◽  
Crack Resistance ◽  
Corrosion Crack Resistance ◽  
Cyclic Corrosion
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