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Book Chapter
Gas Nitriding and Gas Nitrocarburizing of Steels
Available to PurchaseSeries: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005806
EISBN: 978-1-62708-165-8
... Abstract This article summarizes the terminology for gas reactions, and discusses low-temperature nitriding and nitrocarburizing of stainless steels. It describes the various nitriding processes, namely, high- and low-pressure nitriding, oxynitriding, sulfonitriding, oxysulfonitriding, ferritic...
Abstract
This article summarizes the terminology for gas reactions, and discusses low-temperature nitriding and nitrocarburizing of stainless steels. It describes the various nitriding processes, namely, high- and low-pressure nitriding, oxynitriding, sulfonitriding, oxysulfonitriding, ferritic nitrocarburizing and austenitic nitrocarburizing. The article includes a discussion on the difficulties in specimen cleaning, importance of furnace purge, uses of pre and post oxidation, depassivation, or activation, and requirements for perfect nucleation in nitriding process. In nitriding, the successful atmosphere control depends on various potentials. The article summarizes the methods of measuring potentials in nitriding and nitrocarburizing, provides useful information on the furnaces used, and the safety precautions to be followed in the nitriding process. It also describes the sample preparation procedures and testing methods to ensure the quality of the sample.
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Comparison of case depth vs. process time for ion and gas nitriding of 4140...
Available to Purchase
in Plasma (Ion) Nitriding and Nitrocarburizing of Steels
> Steel Heat Treating Fundamentals and Processes
Published: 01 August 2013
Fig. 13 Comparison of case depth vs. process time for ion and gas nitriding of 4140 steel. Source: Ref 18
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Effect of single-stage and double-stage gas nitriding on formation of a com...
Available to PurchasePublished: 01 December 2004
Fig. 37 Effect of single-stage and double-stage gas nitriding on formation of a compound layer in AMS 6470 steel (with 0.15 to 0.35% Pb added). Oil quenched from 900 °C (1650 °F), tempered 2 h at 605 °C (1125 °F), surface activated in manganese phosphate. (a) Gas nitrided 30 h at 525 °C (975
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Reactor used to perform gas nitriding. 1, muffle furnace; 2, outer shell; 3...
Available to PurchasePublished: 01 October 2014
Fig. 39 Reactor used to perform gas nitriding. 1, muffle furnace; 2, outer shell; 3, heater; 4, internal container (retort); 5, gas inlet pipe; 6, exhaust pipe; 7, motor; 8, fan; 9, metal-made jig; 10, gas guide cylinder; 11, inverted funnel; 12, vacuum pump; 13, effluent gas combustion
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Published: 30 September 2014
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Surface roughness of M-50 steel sample before and after gas nitriding at 50...
Available to PurchasePublished: 31 December 2017
Fig. 10 Surface roughness of M-50 steel sample before and after gas nitriding at 500 °C (930 °F). Adapted from Ref 9
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Effect of gas nitriding on roughness of 4140 steel, depending on the initia...
Available to PurchasePublished: 31 December 2017
Fig. 11 Effect of gas nitriding on roughness of 4140 steel, depending on the initial roughness. The average compound layer thickness was 15 μm. Adapted from Ref 9
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Microstructure of quenched and tempered 4140 steel after (a) gas nitriding ...
Available to PurchasePublished: 01 December 1998
Fig. 14 Microstructure of quenched and tempered 4140 steel after (a) gas nitriding for 24 h at 525 °C (975 °F) with 20 to 30% dissociation and (b) gas nitriding for 5 h at 525 °C (975 °F) with 20 to 30% dissociation followed by a second stage of 20 h at 565 °C (1050 °F) with 75 to 80
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Hardness profiles of gas-nitrided (GN) and plasma-nitrided (PN) specimens o...
Available to PurchasePublished: 01 June 2016
Fig. 7 Hardness profiles of gas-nitrided (GN) and plasma-nitrided (PN) specimens of Ti-6Al-4V alloy. T N = 800 °C (1470 °F); t N = 24 h. Source: Ref 20 (translated into English). Used with permission from © Carl Hanser Verlag, München
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(a) Coarse nitride needles in gas-nitrided plain carbon steel. (b) Coarse n...
Available to PurchasePublished: 01 October 2014
Fig. 3 (a) Coarse nitride needles in gas-nitrided plain carbon steel. (b) Coarse nitride needles at high magnification. Transmission electron micrograph
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Influence of gas mixture on hardness profile for laser gas nitrided Ti-6Al-...
Available to PurchasePublished: 01 January 1994
Fig. 7 Influence of gas mixture on hardness profile for laser gas nitrided Ti-6Al-4V, 6.6 × 10 4 W/cm −2 , 1 m/min −1 , 75% track overlap. Source: Ref 15
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Influence of feed rate on hardness profile for laser gas nitrided Ti-6Al-4V...
Available to PurchasePublished: 01 January 1994
Fig. 6 Influence of feed rate on hardness profile for laser gas nitrided Ti-6Al-4V, 6.6 × 10 4 W/cm −2 , 40:60 N2:Ar, 75% track overlap. Source: Ref 15
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Gas nitrided AISI H13 tool steel. Four steps with a rigid grinding disk. Ni...
Available to PurchasePublished: 01 December 2004
Fig. 43 Gas nitrided AISI H13 tool steel. Four steps with a rigid grinding disk. Nital. (a) 200×. (b) 1000×
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Hardness profiles of gas-nitrided (GN) and variously cooled specimens of Ti...
Available to PurchasePublished: 01 June 2016
Fig. 13 Hardness profiles of gas-nitrided (GN) and variously cooled specimens of Ti-6Al-4V. Thickness, 5 mm (0.2 in.); T N = 900 °C (1650 °F); 100% NH 3 . Source: Ref 20 (translated into English). Used with permission from © Carl Hanser Verlag, München
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Gas-nitrided needle beds in large-diameter, fine-gage circular knitting mac...
Available to PurchasePublished: 01 October 2014
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Change of diameter of gas-nitrided hollow cylinders as a function of wall t...
Available to Purchase
in Residual Stresses and Distortion in Thermochemically Treated Steels
> Steel Heat Treating Technologies
Published: 30 September 2014
Fig. 35 Change of diameter of gas-nitrided hollow cylinders as a function of wall thickness. OD, outside diameter; ID, inside diameter. Source: Ref 47 , 49 , 50
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Gas-nitrided 4140 steel (27–31 HRC) drive-gear assembly in which gear teeth...
Available to PurchasePublished: 01 January 2002
Fig. 13 Gas-nitrided 4140 steel (27–31 HRC) drive-gear assembly in which gear teeth deformed because of faulty design and low core hardness. Details A and B show deformed areas on drive-gear teeth and mating internal splines. Dimensions given in inches
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Micrograph and hardness profile in M-50 bearing steel gas nitrided at 500 °...
Available to PurchasePublished: 31 December 2017
Fig. 5 Micrograph and hardness profile in M-50 bearing steel gas nitrided at 500 °C (930 °F) for 60 h with K N = 0.1 atm (−0.5)
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Gas-nitrided 4140 steel (27–31 HRC) drive-gear assembly in which gear teeth...
Available to PurchasePublished: 15 January 2021
Fig. 13 Gas-nitrided 4140 steel (27–31 HRC) drive-gear assembly in which gear teeth deformed because of faulty design and low core hardness. Details A and B show deformed areas on drive-gear teeth and mating internal splines. Dimensions given in inches
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Book Chapter
Tribology of Nitrided and Nitrocarburized Steels
Available to PurchaseSeries: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006355
EISBN: 978-1-62708-192-4
... characteristics of nitriding processes along with a general comparison of carburizing processes in a table. It describes the two most common nitriding methods: gas nitriding and ion (plasma) nitriding. The article discusses the wear behavior of nitrided layers and the wear resistance of selected steels. Rolling...
Abstract
The surface of irons and steels can be hardened by introducing nitrogen (nitriding), nitrogen and carbon (nitrocarburizing), or nitrogen and sulfur (sulfonitriding) into the surface. This article lists the principal reasons for nitriding and nitrocarburizing, and summarizes the typical characteristics of nitriding processes along with a general comparison of carburizing processes in a table. It describes the two most common nitriding methods: gas nitriding and ion (plasma) nitriding. The article discusses the wear behavior of nitrided layers and the wear resistance of selected steels. Rolling-contact fatigue (RCF) occurs in rolling contacts such as bearings, rolls, and gears. The article provides a discussion on rolling-contact fatigue of nitrided steels for aerospace bearing components.
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