Characteristics of Precipitates in an Al- and N-Added Steel and Mo- and Nb-Added Steels for High-Temperature Vacuum Carburizing

2021 ◽  
Author(s):  
Eun Jung Seo ◽  
◽  
John Speer ◽  
David Matlock ◽  
R.L. Cryderman ◽  
...  
Keyword(s):  
High Temperature ◽  
Vacuum Carburizing

Properties of Surface Layers Processed by a New, High-Temperature Vacuum Carburizing Technology with Prenitriding - PreNitLPC®

2012 ◽  
Vol 452-453 ◽  
pp. 401-406 ◽  
Author(s):  
Piotr Kula ◽  
Robert Pietrasik ◽  
Konrad Dybowski ◽  
Sylwester Paweta ◽  
Emilia Wolowiec
Keyword(s):  
High Temperature ◽  
Surface Layers ◽  
Vacuum Carburizing

Influence of surface nanocrystallization pretreatment on high-temperature vacuum carburizing behavior

2020 ◽  
Vol 278 ◽  
pp. 116519 ◽  
Author(s):  
Meiling Dong ◽  
Xiufang Cui ◽  
Bingwen Lu ◽  
Xiangru Feng ◽  
Shengqiang Song ◽  
...  
Keyword(s):  
High Temperature ◽  
Vacuum Carburizing ◽  
Surface Nanocrystallization

Vacuum Carburizing of AISI S7 Tool Steel

2006 ◽  
Vol 118 ◽  
pp. 91-96 ◽  
Author(s):  
Liu Ho Chiu ◽  
Yu Jen Chen ◽  
Chang Hui Wu ◽  
Heng Chang
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Low Temperature ◽  
Tool Steel ◽  
Retained Austenite ◽  
Surface Hardness ◽  
Vacuum Carburizing ◽  
Modest Increase ◽  
Gas Quenching ◽  
Quenching And Tempering

The 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 those of the specimens carburized at 950, due to the large amount of retained austenite in specimens carburized at 1000. Under high temperature tempering, specimens carburized at 1000 have higher surface hardness than specimens carburized at 950. As specimens are tempered in the range between 450 to 550, the surface hardness of carburized specimens show a modest increase due to the secondary hardening effects. According to the fracture toughness data, the toughness of carburized specimens peaked at tempering at 600.

Properties of steels after high-temperature vacuum carburizing

1980 ◽  
Vol 22 (6) ◽  
pp. 379-385
Author(s):  
M. A. Krishtal ◽  
S. N. Tsepov
Keyword(s):  
High Temperature ◽  
Vacuum Carburizing

Properties of Surface Layers Processed by a New, High-Temperature Vacuum Carburizing Technology with Prenitriding - PreNitLPC®

2012 ◽  
Vol 452-453 ◽  
pp. 401-406 ◽  
Author(s):  
Piotr Kula ◽  
Robert Pietrasik ◽  
Konrad Dybowski ◽  
Sylwester Paweta ◽  
Emilia Wołowiec
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
High Temperature ◽  
Grain Growth ◽  
Impact Resistance ◽  
Surface Layers ◽  
Vacuum Carburizing ◽  
Carburized Steel ◽  
Austenite Grain ◽  
Austenite Grain Growth

The variety of vacuum carburizing with prenitriding (PreNitLPC® technology) consists in metering ammonia in the stage of charge heating for carburizing to reduce grain growth in the surface layer of carburized steel. This paper presents the effect of nitrogen interaction on the reduction of austenite grain growth during vacuum carburizing and on the mechanical properties (fatigue strength, impact resistance) of the layer treated in this way in relation to conventional carburizing methods.

scholarly journals The Future of the Integral Quench Furnace

2019 ◽  
Author(s):  
Mark K. Hemsath ◽  
Daniel H. Herring ◽  
Tomasz Przygonski
Keyword(s):  
High Temperature ◽  
Stress Relief ◽  
Low Pressure ◽  
Temperature Uniformity ◽  
Environmental Compliance ◽  
Vacuum Carburizing ◽  
Competitive Price ◽  
Price Point ◽  
The Future ◽  
Temperature Hardening

Abstract Welcome to the 21st Century and the future of the integral quench furnace. The future means safer processing, simple, yet advanced automation, and environmental compliance, all with the proven performance of low pressure processed component parts. The future furnace combines the benefits of low-pressure vacuum carburizing (LPC) technology with atmosphere integral oil quenching. The future means less gas usage, tighter process control, better temperature uniformity, effortless hardening and increased productivity at a highly competitive price point. Added benefits are seamless annealing, normalizing, stress relief, and high temperature hardening processes.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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