Features of phase and structural transformations of structural steels under non-traditional modes of heat treatment

2020 ◽  
pp. 63-65
Author(s):  
D.M. Berdiev ◽  
M.A. Umarova ◽  
R.K. Toshmatov
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Extreme Temperature ◽  
High Hardness ◽  
Structural Transformations ◽  
Structural Steels ◽  
Low Alloy Steel ◽  
Standard Temperature ◽  
Density Of Dislocations ◽  
Α Phase

It is determined, that during heat treatment of structural steels with heating to an extreme temperature during quenching or normalization, the increase in the density of dislocations in the crystal structure of the α-phase is comparable to the density when heated to a standard temperature (Ac3 + 30÷50 °C), and its change depends on the amount of carbon and chemical alloying elements in steel. Keywords heat treatment, high hardness, dislocation density, extreme temperature, low alloy steel. [email protected].

scholarly journals Improving the wear resistance of steel products by using non-standard heat treatment modes. Foundryproductionandmetallurgy

2021 ◽  
pp. 100-104
Author(s):  
D. M. Berdiev ◽  
A. A. Yusupov
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Heating Temperature ◽  
Low Alloy Steels ◽  
Standard Heat Treatment ◽  
Standard Temperature ◽  
Density Of Dislocations ◽  
Α Phase ◽  
Alloy Steels

The use of non-standard modes of heat treatment increases the density of dislocations in the crystal structure of the α-phase and increases the wear resistance of carbon, low-alloy steels under various friction conditions, which is comparable to the results when heated to a standard temperature (Ac3 + 30–50 °C). The preliminary extreme heating temperature is determined. After requenching at standard temperature and low tempering, the wear resistance of steels under various types of friction increases by up to 40 % compared to standard quenching.

Study of Heat Treatment Technology on Medium-Carbon-Low-Alloy-Steel Large Hammer Formation of Gradient Performance

2014 ◽  
Vol 881-883 ◽  
pp. 1288-1292
Author(s):  
Mei Ci Pan ◽  
Xiao Lie Liu ◽  
Rong Zou ◽  
Jie Huang ◽  
Jia Cai Han
Keyword(s):  
Heat Treatment ◽  
Alloy Steel ◽  
Lath Martensite ◽  
High Hardness ◽  
Experimental Alloy ◽  
Low Alloy Steel ◽  
Austenitizing Temperature ◽  
Treatment Technology ◽  
Head Formation ◽  
Hammer Head

In view of the requirements of the heat treatment on low alloy steel large hammer head formation of gradient performance, mainly study the effect of austenitizing temperature on the alloy mechanical properties and organizational . The results show that: austenitizing temperatures have little effection on the experimental alloys hardness but have great effection on toughness. At the austenitizing temperature 820°C, the experimental alloy obtained the high hardness and low toughness by quenching, and obtained high toughness and low hardness by normalizing; The quenched microstructure of the experimental alloy is mainly lath martensite; the microstructure after normalizing is pearlite + a small amount of ferrite.

Non-standard modes of heat treatment and their influence on the wear resistance of steel products

2021 ◽  
pp. 61-63
Author(s):  
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Dislocation Density ◽  
Carbon Steels ◽  
Low Alloy Steels ◽  
Standard Heat Treatment ◽  
Density Of Dislocations ◽  
Alloy Steels ◽  
Alloy Carbon

The wear resistance of low-alloy carbon steels after non-standard heat treatment, which increases the density of dislocations in the crystal structure of the a-phase, under different friction conditions is investigated. Keywords: wear resistance, heat treatment, hardness, carbon and low-alloy steels, dislocation density. [email protected]

scholarly journals Evaluation of Heat Treatment Parameters on Microstructure and Hardness Properties of High-Speed Selective Laser Melted Ti6Al4V

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 255
Author(s):  
Paul Lekoadi ◽  
Monnamme Tlotleng ◽  
Kofi Annan ◽  
Nthabiseng Maledi ◽  
Bathusile Masina
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Selective Laser Melting ◽  
Residence Time ◽  
High Speed ◽  
High Hardness ◽  
Laser Melting ◽  
Cooling Method ◽  
Α Phase ◽  
Melting Technique

This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using high speed selective laser melting technique. Heat treatment was performed on the produced samples before they were characterized for microstructure and hardness. The microstructure of the as-built sample contained large columnar β-grains that were filled with martensite α’ phase and had a high hardness of 383 ± 13 HV. At 1000 °C and residence time of maximum 4 h, better heat treatment parameters were seen for the selective laser melting (SLM) produced Ti6Al4V sample since an improved lamellar α + β microstructure was obtained at this condition. This microstructure is known to have improved tensile properties.

ALMANITE W

Alloy Digest ◽  
1974 ◽  
Vol 23 (3) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Impact Strength ◽  
Surface Treatment ◽  
High Hardness ◽  
Heat Treating ◽  
Austenitic Matrix ◽  
Matrix Type ◽  
Martensitic Matrix ◽  
Cast Condition

Abstract ALMANITE W comprises a series of three types of austenitic-martensitic white irons characterized by high hardness and relatively good impact strength. Type W1 has a pearlitic matrix. Type W2 has a martensitic matrix, Type W4 is highly alloyed to provide an austenitic matrix in the as-cast condition which may be further modified to give a martensitic matrix by heat treatment or by refrigeration. This datasheet provides information on composition, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on casting, heat treating, machining, and surface treatment. Filing Code: CI-42. Producer or source: Meehanite Metal Corporation.

CPM REX 25

Alloy Digest ◽  
1980 ◽  
Vol 29 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
High Hardness ◽  
Heat Treating ◽  
High Speeds ◽  
Aisi Type ◽  
Tool Performance ◽  
End Mills ◽  
Machining Operations

Abstract CPM REX 25 is a super high-speed steel made without cobalt. It is comparable to AISI Type T15 cobalt-containing high-speed steel in response to heat treatment, properties, and tool performance. CPM REX 25 is recommended for machining operations requiring heavy cuts, high speeds and feeds, and difficult-to-machine materials of high hardness and abrasion resistance. Typical applications are boring tools, drills, gear cutters, punches, form tools, end mills and broaches. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming, heat treating, machining, and surface treatment. Filing Code: TS-365. Producer or source: Crucible Materials Corporation.

REPUBLIC 65

Alloy Digest ◽  
1960 ◽  
Vol 9 (5) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Tensile Properties ◽  
Yield Point ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
Low Alloy Steel ◽  
Rolled Condition ◽  
Hardening Heat Treatment ◽  
Minimum Yield

Abstract REPUBLIC-65 is a precipitation hardenable low alloy steel which will meet 65000 psi minimum yield point in the as-rolled condition followed by a precipitation hardening heat treatment. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-98. Producer or source: Republic Steel Corporation.

scholarly journals Enabling propagation of anisotropic polaritons along forbidden directions via a topological transition

2021 ◽  
Vol 7 (14) ◽  
pp. eabf2690
Author(s):  
J. Duan ◽  
G. Álvarez-Pérez ◽  
K. V. Voronin ◽  
I. Prieto ◽  
J. Taboada-Gutiérrez ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Silicon Carbide ◽  
Molybdenum Trioxide ◽  
Real Space ◽  
Negative Permittivity ◽  
Topological Transition ◽  
Α Phase ◽  
Direct Light ◽  
Gap Opening ◽  
Phonon Polaritons

Polaritons with directional in-plane propagation and ultralow losses in van der Waals (vdW) crystals promise unprecedented manipulation of light at the nanoscale. However, these polaritons present a crucial limitation: their directional propagation is intrinsically determined by the crystal structure of the host material, imposing forbidden directions of propagation. Here, we demonstrate that directional polaritons (in-plane hyperbolic phonon polaritons) in a vdW crystal (α-phase molybdenum trioxide) can be directed along forbidden directions by inducing an optical topological transition, which emerges when the slab is placed on a substrate with a given negative permittivity (4H–silicon carbide). By visualizing the transition in real space, we observe exotic polaritonic states between mutually orthogonal hyperbolic regimes, which unveil the topological origin of the transition: a gap opening in the dispersion. This work provides insights into optical topological transitions in vdW crystals, which introduce a route to direct light at the nanoscale.

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