Results 201 to 210 of about 359 (232)
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Computation of carbon concentration curves in vacuum carburizing of steels
Metal Science and Heat Treatment, 2013The boundary conditions of the diffusion problem in parametric form are determined on the basis of an experimental study of formation of carbon-saturated layers in vacuum carburizing. The boundary conditions are applied in a model of a process with cyclic modes of carburizing. Adequacy of the developed model is confirmed.
M Yu Semenov, A E Smirnov, Semenov M Yu
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Catalytic Treatment of Vacuum Carburizing Off Gas
Chemical Engineering & Technology, 2006The aim of this investigation was to find a suitable procedure for the treatment of higher polycyclic aromatic hydrocarbons, produced during vacuum carburizing of steel. In a lab scale apparatus the carburizing gas acetylene was pyrolyzed and the generated gases converted in a downstream catalytic bed reactor.
Trujillo, C. A. +3 more
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Vacuum Carburizing of AISI S7 Tool Steel
Solid State Phenomena, 2006The effects of vacuum carburizing under an acetylene atmosphere at 950 and 1000, followed by gas quenching and tempering at various temperatures on the properties of AISI S7 shock-resistant tool steel were studied. As carburized specimens undergo low temperature tempering, the surface hardness of the quenched specimens carburized at 1000 is lower than ...
Liu Ho Chiu +3 more
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Metal Science and Heat Treatment, 2020
The properties of steel parts after carburizing in low-pressure acetylene are studied. The thickness of the carburized layer, its hardness, the microstructure, and the hardness of the core are determined after carburizing at 900 – 960°C with simultaneous shortening of the process from 104 to 44 min. The data obtained for the diffusion of carbon make it
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The properties of steel parts after carburizing in low-pressure acetylene are studied. The thickness of the carburized layer, its hardness, the microstructure, and the hardness of the core are determined after carburizing at 900 – 960°C with simultaneous shortening of the process from 104 to 44 min. The data obtained for the diffusion of carbon make it
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Low Pressure Carburizing in a Vacuum Furnace
Heat Treating Conference, 2015Abstract Historically, this carburizing has been performed in an endothermic gas consisting of CO2, CH4, CO, etc, but carburizing in low pressure with the proper gas mixture changes the landscape. Using C2 H2, the process is no longer endothermic as C2H2 is a catalytically decomposable hydrocarbon and dissociates in the presence of an ...
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GAS AND VACUUM CARBURIZING AND HEAT TREATMENT OF CARBURIZING GRADE STEEL PARTS
2021<div class="section abstract"> <div class="htmlview paragraph">This specification, in conjunction with the general requirements for steel heat treatment covered in AMS 2759, establishes the requirements and procedures for three classes of gas and vacuum carburizing and related heat treatment of parts fabricated from carburizing grade ...
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Advantages and commercial application problems of vacuum carburization
Polymer Science, Series D, 2017Different gas carburization methods intended for processing quality assurance are compared by analyzing the indices of the applied processing atmosphere, i.e., the carbon potential level and the possibility of its regulation, as well as the weight transfer ratio.
R. S. Fakhurtdinov +2 more
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Materials Chemistry and Physics, 2003
Abstract In this article, three commercial steels, JIS SCM 415, JIS SNCM 220 and AISI 1008 were carburized in a two-chamber vacuum furnace at temperature ranging between 900 and 1050 °C in an acetylene atmosphere. Steel SCM 415 consists of mainly 0.12% C, 1.0% Cr and 0.17% Mo, steel SNCM 220 consists of 0.18% C, 0.55% Mo, 0.42% Cr and 0.17% Mo, while
Lee-Der Liu, Fan-Shiong Chen
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Abstract In this article, three commercial steels, JIS SCM 415, JIS SNCM 220 and AISI 1008 were carburized in a two-chamber vacuum furnace at temperature ranging between 900 and 1050 °C in an acetylene atmosphere. Steel SCM 415 consists of mainly 0.12% C, 1.0% Cr and 0.17% Mo, steel SNCM 220 consists of 0.18% C, 0.55% Mo, 0.42% Cr and 0.17% Mo, while
Lee-Der Liu, Fan-Shiong Chen
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Influence of carburizing pressure on the blind hole carbide during the vacuum carburizing process
Mechatronics and Manufacturing Technologies, 2017Feng Zhao, Xiao-Li Hu
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Mechanical properties of steels after vacuum and gas carburizing
Metal Science and Heat Treatment, 19901. After heating to 1100°C and subsequent phase recrystallization to cycles making it possible to obtain an approximately 2 mm case depth in vacuum carburizing the mechanical properties (σt, σy, Ψ, δ) of the investigated steel and also the impact strengtha1 do not drop with the exception ofa1, of 20Kh steel, which decreases by 6.7% after heating at ...
A. G. Goncharov, R. P. Uvarova
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