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ammonia

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Published: 01 January 2015
Fig. 21.41 Ammonia concentration in ammonia-hydrogen mixtures and temperature ranges for the formation of various Fe-N phases. Source: Ref 21.72 More
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Published: 31 December 2020
Fig. 8 Increase in end-quench hardenability by adding ammonia to the carburizing atmosphere. These curves were obtained under the following processing conditions: 3 hour treatment time at 840 °C (1550 °F), water quench; furnace atmospheres: 90% endothermic carrier gas, 10% natural gas under More
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Published: 01 November 2007
Fig. 4.26 Nitriding depth of Type 304SS in ammonia (100% in the inlet gas and 60% in the exhaust) at 525 °C (980 °F) as a function of exposure time. Source: Ref 4 More
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Published: 01 August 1999
Fig. 12.27 (Part 1) Case carburizing: gas carburizing in an ammonia-containing atmosphere. 0.15% C (0.17C-0.05Si-0.64Mn, wt%). (a) and (b) Gas carburized at 880 °C for 3.25 h; 5% ammonia added during last hour, sealed quench in oil. Direct from carburizing furnace; tempered at 150 °C More
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Published: 01 August 1999
Fig. 12.27 (Part 2) Case carburizing: gas carburizing in an ammonia-containing atmosphere. 0.15% C (0.17C-0.05Si-0.64Mn, wt%). (a) and (b) Gas carburized at 880 °C for 3.25 h; 5% ammonia added during last hour, sealed quench in oil. Direct from carburizing furnace; tempered at 150 °C More
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Published: 01 June 2007
Fig. 5.52 Auger composition-depth profile of 316L sintered in dissociated ammonia and slowly furnace cooled. Note chromium and nitrogen enrichment on surface. Source: Ref 28 . Reprinted with permission from MPIF, Metal Powder Industries Federation, Princeton, NJ More
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Published: 01 June 2007
Fig. 7.10 Fatigue curves for two dissociated-ammonia-sintered ferritic stainless steels; parenthetical. Sintered densities of 403N2 and 434N2 were 7.04 and 7.07 g/cm 3 , respectively. Sintered densities of 430N29 and 434N29 were 7.27 and 7.24 g/cm 3 , respectively. Sintering temperature More
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Published: 01 December 2003
Fig. 3 Schematic of a simple ammonia gas nitriding furnace More
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Published: 01 December 2003
Fig. 1 Simple schematic arrangement of an ammonia gas nitriding system. A, bulk storage tank; B, gas nitriding furnace; C, gas dissociation test station; D, exhaust to atmosphere. Source: Pye Metallurgical Consulting Inc. More
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Published: 01 December 2003
Fig. 3 Illustration of the ammonia molecule 2NH 3 and its decomposition More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900039
EISBN: 978-1-62708-350-8
... heat losses, and factors influencing furnace configuration and design. It also covers the processes involved in the construction and maintenance of retorts, methods for sealing a retort to prevent ammonia leaks, and safety precautions to be taken while using ammonia. Further, the chapter provides...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900023
EISBN: 978-1-62708-350-8
... Fig. 1 Simple schematic arrangement of an ammonia gas nitriding system. A, bulk storage tank; B, gas nitriding furnace; C, gas dissociation test station; D, exhaust to atmosphere. Source: Pye Metallurgical Consulting Inc. Fig. 2 Schematic of interstitial diffusion during...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090043
EISBN: 978-1-62708-266-2
... Abstract This chapter addresses the issue of stress-corrosion cracking (SCC) in carbon and low-alloy steels. It discusses crack initiation, propagation, and fracture in aqueous chloride, hydrogen sulfide, sulfuric acid, hydroxide, ammonia, nitrate, ethanol, methanol, and hydrogen gas...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080067
EISBN: 978-1-62708-304-1
.... It provides images and data describing the nitridation process and its effects on metals and alloys in high-temperature air as well as NH3-H2O, NH3 and H2-N2-NH3, and N2 environments. It also includes test data showing that nitridation is more severe in a nitrogen atmosphere than an ammonia environment...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250227
EISBN: 978-1-62708-345-4
... processing, excessive ammonia, or excessive temperature. Heavy continuous iron nitride network at tooth tip may be cause for rejection. Core : The core structure should be essentially tempered martensite. Ferrite patches and transformation products (bainite and pearlite) should not exceed 1.586 mm ( 1...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090221
EISBN: 978-1-62708-266-2
... to the practice of storing the cartridge cases in horse barns, where they came in contact with ammonia vapors. A further contributing factor was the cold forming operation used to make the cases, which introduced high residual tensile stresses. Sperry ( Ref 7.1 ) provides further discussion of these early SCC...
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Published: 01 December 2003
Fig. 2 Schematic of interstitial diffusion during the nitriding process. The work is heated to the nitriding temperature with ammonia flowing into the retort. The ammonia gas dissociates to nitrogen and hydrogen at the part surface. The nitrogen diffuses into the work in atomic form More
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Published: 01 June 2007
Fig. 7.5 Effect of temperature on the equilibrium nitrogen content of 304L in dissociated ammonia (D.A.) and nitrogen (bottom); and ultimate tensile strength (UTS) and elongation of 304L sintered in pure hydrogen at 1204 °C (2200 °F) and then nitrided in dissociated ammonia long enough More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900031
EISBN: 978-1-62708-350-8
.... 4 A sharp corner profile, illustrating the effects of nitrogen enrichment (nitride networking) at the corner Fig. 5 The metallographic appearance of AISI 1015 (UNS G10150) steel after a 2 h vacuum nitrocarburizing treatment in an ammonia/methane mixture with 1% oxygen addition...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900111
EISBN: 978-1-62708-350-8
... of the two processes should be the same ( Tables 1 , 2 ). Measurement of the gas process dissociation is not the same as for gas nitriding. The gas dissociation measurement of ammonia in the conventional gas nitriding system is based on the solubility of ammonia in water. Water will absorb 70 times its...