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.

Relationships between the Microstructure, Hardness and Fracture Toughness of Differently Sub-Zero Treated Tool Steel

2019 ◽  
Vol 395 ◽  
pp. 95-112 ◽  
Author(s):  
Peter Jurči ◽  
Ivo Dlouhý ◽  
Jakub Horník ◽  
Petra Priknerová ◽  
Zdeněk Mrštný
Keyword(s):  
Fracture Toughness ◽  
Low Temperature ◽  
Population Density ◽  
Tool Steel ◽  
Retained Austenite ◽  
Room Temperature ◽  
Secondary Hardening ◽  
Temperature Quenching ◽  
Treated Steel ◽  
Different Temperatures

A PM made Cr-V ledeburitic tool steel Vanadis 6 has been subjected to conventional austenitizing and quenching, which was followed by sub-zero treatment at different temperatures, and by tempering treatments. The microstructure, hardness and fracture toughness of sub-zero treated steel have been investigated with reference to the same material after conventional room temperature quenching. The main findings are that sub-zero treatments reduce the retained austenite amount, enhance the population density of small carbides, refine the martensite and change the precipitation of carbides during tempering. These alterations are reflected in elevated hardness after low-temperature tempering but slightly lowered hardness after tempering within the normal secondary hardening temperature range, except the specimens treated at-140 °C where the hardness improvement was maintained. The fracture toughness is rather negatively influence by the sub-zero treatments, except the treatment at-140 °C where no impact or rather improvement has been recorded; thus, the treatment at a temperature of-140 °C seems to be a promising way how to improve the hardness and the fracture toughness pf the Vanadis 6 steel simultaneously.

UDDEHOLM QRO 80 MICRODIZED

Alloy Digest ◽  
1987 ◽  
Vol 36 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Elevated Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Die Casting ◽  
Heat Treating ◽  
Temperature Performance ◽  
Improved Performance

Abstract UHB QRO 80 MICRODIZED is a chromium-molybdenum-vanadium tool steel with improved performance for tooling used at elevated temperature as in forging, extrusion and die casting. It is electro-slag refined. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-486. Producer or source: Uddeholm Aktiebolag.

MILNE CMV

Alloy Digest ◽  
1961 ◽  
Vol 10 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Tensile Properties ◽  
Tool Steel ◽  
Compression Strength ◽  
Heat Treating ◽  
Medium Carbon ◽  
Temperature Performance

Abstract Milne CMV is a 5% chromium, medium-carbon hot work tool steel, having high compression strength, wear resistance, and corrosion resistance. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-111. Producer or source: A. Milne & Company (Distributor).

UHB 711

Alloy Digest ◽  
1960 ◽  
Vol 9 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Tensile Properties ◽  
Tool Steel ◽  
Heat Treating ◽  
Heavy Duty ◽  
Temperature Performance

Abstract UHB-711 is a heavy duty special oil hardening tool steel having good shock and wear resisting qualities. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, and machining. Filing Code: TS-91. Producer or source: Uddeholm Company of America Inc..

NICLOY 5

Alloy Digest ◽  
1960 ◽  
Vol 9 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Ferritic Steel ◽  
Heat Treating ◽  
Low Carbon ◽  
Temperature Performance

Abstract NICLOY 5 is a low carbon, nickel ferritic steel reecommended for low temperature service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-96. Producer or source: Babcock & Wilcox Company.

CARPENTER No. 882

Alloy Digest ◽  
1978 ◽  
Vol 27 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Cold Work ◽  
Heat Treating ◽  
Temperature Performance ◽  
Hot Work Tool Steel ◽  
Red Hardness

Abstract CARPENTER No. 882 is a 5% chromium hot-work tool steel designed particularly for applications requiring extreme toughness combined with good red hardness. It also has found cold-work applications. It can be used at strength levels in excess of 260,000 psi (18,300 kg/cm2). This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-339. Producer or source: Carpenter.

CARPENTER MICRO-MELT A11-LVC

Alloy Digest ◽  
2000 ◽  
Vol 49 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Tool Steel ◽  
Heat Treating ◽  
Temperature Performance

Abstract Micro-Melt A11-LVC is a high-vanadium tool steel produced by the Carpenter Micro-Melt powder process. It provides higher toughness than Carpenter Micro-Melt A11 (Alloy Digest TS-571, January 2000) with lower wear resistance. It is used where slightly less wear resistance than that of Micro-Melt A11 is acceptable. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and wear resistance as well as heat treating and machining. Filing Code: TS-573. Producer or source: Carpenter.

scholarly journals THE INFLUENCE OF THE SOAKING TEMPERATURE OF NITRIDED WCL TOOL STEEL (EN-X37CrMoV5-1) ON THE MICROHARDNESS AND TRIBOLOGICAL WEAR OF THE SURFACE LAYER

Tribologia ◽  
2016 ◽  
Vol 268 (4) ◽  
pp. 69-78
Author(s):  
Michał DWORAK ◽  
Adrian BARYLSKI ◽  
Krzysztof ANIOŁEK ◽  
Elizaveta STEPANOVA
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Low Temperature ◽  
Tool Steel ◽  
Nitrided Layer ◽  
Industrial Furnace ◽  
Tribological Tests ◽  
Nitrided Steel ◽  
Hot Work Tool Steel ◽  
Soaking Temperature

The present paper refers to the evaluation of the influence of soaking temperature of nitrided hot work tool steel, X37CrMoV5-1 (WCL), intended for dies for extruding aluminium profiles, on the structure, microhardness, and tribological wear of the nitrided layer. The research involved nitrided steel specimens (X37CrMoV5-1) soaked for 8 hours in an industrial furnace at temperatures of 450°C, 480°C, 520°C, 560°C, and 600°C. For comparison purposes, a REFERENCES material was used, which was not soaked after nitriding. Initially, as the soaking temperature raised, the microhardness of the nitrided layer increased by ca. 10%; however, a further increase in the soaking temperature to more than 450°C caused a decrease in the microhardness of the nitrided layer. The results of tribological tests showed that soaking nitrided steel at a low temperature (450°C) and high temperature (600°C) caused a decrease in tribological wear. Out of the tested materials, the highest microhardness of the upper layer was observed in the samples soaked at 450°C, while the highest resistance to tribological wear was obtained for the samples soaked at 600°C. The conducted tests indicate the possibility of extending the lifetime of dies made from the investigated nitrided steel.

Microstructural Characterization of Ledeburitic Tool Steel after Sub-Zero Treatment and Tempering

2020 ◽  
Vol 403 ◽  
pp. 103-109
Author(s):  
Jana Ptačinová ◽  
Juraj Ďurica ◽  
Matej Pašák ◽  
Martin Kusy ◽  
Peter Jurči
Keyword(s):  
Population Density ◽  
Tool Steel ◽  
Retained Austenite ◽  
Microstructural Characterization ◽  
Vacuum Furnace ◽  
Nitrogen Gas ◽  
Tempering Temperature ◽  
Heat Treated ◽  
Gas Quenching

Microstructural characterization of ledeburitic tool steel Vanadis 6 after sub-zero treatment and tempering has been examined. The samples were heat treated using following schedules: heating to the austenitizing temperature (TA = 1050 °C) in a vacuum furnace, hold at the final temperature for 30 min. and nitrogen gas quenching (5 bar). The sub-zero treatments consisted of immediate (after quenching) immersion of the material into the liquid helium (-269 °C), hold at the soaking temperature and removal the samples to be heated to a room temperature. Double tempering has been performed at the temperatures from the range 170 – 530 °C, whereas each tempering cycle was realized with a hold of 2 h. Typical heat treated microstructure of ledeburitic steels consists, besides of the martensitic matrix with certain amount of retained austenite, of several types of carbides – eutectic, secondary and small globular carbides. In sub-zero treated steel the amount of retained austenite is significantly reduced. The population density of small globular carbides increase as a result of sub-zero treating. Tempering of the material resulted in decrease in population density of small globular carbides with increasing the tempering temperature. The hardness of sub-zero treated material is higher than that of conventionally quenched one. Also, this tendency is preserved when the steel is low-temperature tempered. On the other hand, the hardness of conventionally quenched steel becomes higher than that of SZT one when tempered at the temperature of secondary hardening.

scholarly journals Optimization of Quenching and Tempering Parameters for the Precipitation of M7C3 and MC Secondary Carbides and the Removal of the Austenite Retained in Vanadis 10 Tool Steel

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 627 ◽  
Author(s):  
Alejandro Gonzalez-Pociño ◽  
Florentino Alvarez-Antolin ◽  
Juan Asensio-Lozano
Keyword(s):  
Heat Treatment ◽  
Tool Steel ◽  
Retained Austenite ◽  
Process Variables ◽  
Tempering Temperature ◽  
X Ray ◽  
Secondary Carbides ◽  
Service Behavior ◽  
Hardness Values ◽  
Quenching And Tempering

Vanadis 10 steel is a powder metallurgy processed tool steel. The aim of the present study is to analyze the microstructural variation in this steel that takes place when the process variables related to the heat treatments of quenching and tempering are modified. Specifically, the destabilization of austenite, the precipitation of secondary carbides and the amount of retained austenite were analyzed. The research methodology employed was a Design of Experiments (DoE). The percentage and types of precipitated crystalline phases were determined by XRD, while the microstructure was revealed by means of SEM-energy-dispersive X-ray spectroscopy (EDX). The destabilization of austenite was favored by tempering at 600 °C for at least 4 h. These same conditions stimulated the removal of the retained austenite and the precipitation of M7C3 secondary carbides. For the precipitation of MC secondary carbides, it was necessary to maintain the steel at a temperature of 1100 °C for at least 8 h. The highest hardness values were obtained when the tempering temperature was lower (500 °C). Tempering in air or oil did not have a significant influence on the hardness of the steel after double or triple tempering at 500 or 600 °C. These results allow the manufacturers of industrial tools and components that use this type of steel in the annealed state as a material to define the most suitable quenching and tempering heat treatment to optimize the in-service behavior of these steels.

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