Preparation, composition, structure and properties of mechanically alloyed heat‑resistant steels

Despite a significant amount of work in the field of mechanically doped alloys and, above all, based on aluminum and copper, research aimed at creating mechanically doped alloys is extremely limited. In this regard, the following work aimed at to establishing the regularities of the formation of the phase composition, structure, and properties in the implementation of the technology for obtaining mechanically doped heat‑resistant steels, is important and relevant.The basis for the development of mechanically doped alloys were the results of long‑term research carried out at the Belarusian‑Russian University and aimed at studying mechanically and thermally activated structural phase transformations taking place at all the technological stages of obtaining mechanically doped metal alloys. In this article, in a generalized form the final research results are presented, revealing the patterns of these transformations, which are a reliable scientific basis for the creation of mechanically doped complex‑hardened heat‑resistant steels.

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Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Metals ◽

10.3390/met11101638 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1638

Author(s):

Nikolay Ababkov ◽

Alexandr Smirnov ◽

Vladimir Danilov ◽

Lev Zuev ◽

Natalya Popova ◽

...

Keyword(s):

Mechanical Properties ◽

Phase State ◽

Structural Phase ◽

Magnetic Characteristics ◽

Internal Stresses ◽

Power Equipment ◽

Deformation Localization ◽

Structural Phase State ◽

Heat Resistant ◽

Heat Resistant Steels

The paper presents the results of the analysis of the microstructure, mechanical properties, acoustic and magnetic characteristics of the metal of pipelines that are part of heat and power equipment, after long-term operation, made of structural and heat-resistant steels in the zones of localization of plastic deformation. Samples of 0.2 С steel and 0.12С-1Сr-1Mo-1V steel were studied in the initial state, as well as after operation for 219 and 360 thousand hours, respectively. As a result of the studies carried out for each sample, the phase composition was determined (qualitatively and quantitatively), and the following parameters of the fine structure were calculated: volume fractions of structural components of steel (pearlite and ferrite), scalar and excess ± dislocation density, curvature-torsion of the crystal lattice χ, amplitude of internal stresses (shear stress and long-range stresses). All quantitative parameters of the structure are determined both in each structural component of steel, and in general for each sample. The structure of the metal of all specimens after deformation before the formation of zones of stable localization of deformations consists of a ferrite-pearlite mixture, and for specimens after operation before fracture only of unfragmented and fragmented ferrite. Ferrite, which occupies the bulk of the material, is present both unfragmented and fragmented. For all samples, the ratios ≥ , χ = χpl, σL ≥ σd were calculated, which indicate whether there is a danger of the initiation of microcracks in metal samples. For specimens without operation and after operation without damage in zones of stable localization of deformations, these conditions are met, and for specimens after operation until destruction, they are not met. It was found that the structural-phase state in the zones of localization of deformations has a direct effect on the characteristics of non-destructive tests. Thus, for all investigated samples, the values of such parameters as the delay time of the surface acoustic wave, the attenuation coefficient, the amplitude of the received signal, and the intensity of magnetic noise in the zones of deformation localization were established.

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Long-term strength of heat-resistant steels under creep conditions

Metal Science and Heat Treatment ◽

10.1007/bf00779399 ◽

1980 ◽

Vol 22 (12) ◽

pp. 889-892

Author(s):

V. F. Zlepko ◽

M. M. Melamed ◽

T. A. Shvetsova

Keyword(s):

Term Strength ◽

Heat Resistant ◽

Heat Resistant Steels

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Long-Term Creep Life Prediction Based on Understanding of Creep Deformation Behavior of Ferritic Heat Resistant Steels

IUTAM Symposium on Creep in Structures - Solid Mechanics and its Applications ◽

10.1007/978-94-015-9628-2_26 ◽

2001 ◽

pp. 267-276 ◽

Cited By ~ 1

Author(s):

K. Yagi ◽

F. Abe ◽

K. Kimura ◽

H. Kushima

Keyword(s):

Creep Deformation ◽

Deformation Behavior ◽

Life Prediction ◽

Creep Life ◽

Heat Resistant ◽

Creep Life Prediction ◽

Term Creep ◽

Heat Resistant Steels

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Creep-Fatigue Behaviour of Heat Resistant Steels Under Service-Type Long-Term Conditions

Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials—3 ◽

10.1007/978-94-011-2860-5_39 ◽

1992 ◽

pp. 235-241 ◽

Cited By ~ 5

Author(s):

J. Granacher ◽

A. Scholz

Keyword(s):

Fatigue Behaviour ◽

Long Term Conditions ◽

Heat Resistant ◽

Service Type ◽

Creep Fatigue ◽

Heat Resistant Steels

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Specifics of processing of corrosion-resistant and heat-resistant steels

10.33920/pro-2-2011-09 ◽

2020 ◽

pp. 66-74

Author(s):

A. S. Kulikov ◽

A. A. Majorov

Keyword(s):

Resistant Steel ◽

Structure And Properties ◽

Secondary Phases ◽

Tool Selection ◽

Geometry Processing ◽

Corrosion Resistant ◽

Heat Resistant ◽

Heat Resistant Steels ◽

Plate Geometry ◽

Cutting Modes

The features of the structure and properties of corrosion-resistant and heat-resistant steels and alloys, the effect on the machinability of cutting and tool selection are shown. Issues related to the machining of corrosion-resistant steel are considered. The best workability of steels is achieved by heat treatment by annealing or tempering due to the separation of secondary phases from the solid solution. By changing and selecting cutting modes and cutting plate geometry, processing can be carried out at speeds up to 274 m / min, with a side allowance of up to 3 mm.

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