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Nitriding

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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
...Abstract Abstract Nitriding is a surface hardening heat treatment that introduces nitrogen into the surface of steel while it is in the ferritic condition. Gas nitriding using ammonia as the nitrogen-carrying species is the most commonly employed process and is emphasized in this chapter...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900001
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter discusses the metallurgical considerations and process requirements of nitriding. It presents the pioneering work of Adolph Machlet and Adolph Fry. Following a presentation of Fry's work at the 1927 SME conference, American metallurgists began exploring nitriding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900023
EISBN: 978-1-62708-350-8
...Abstract Abstract Several process parameters must be considered in order to ensure nitriding success in terms of metallurgy and distortion: nitrogen source, heat, time, and steel composition. This chapter provides a detailed discussion on the following topics: the liberation of nitrogen...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900053
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter presents the salts used and the process advantages of salt bath nitriding. It discusses the types of salt bath nitriding processes, such as preheating, immersion into the molten salt bath, cooling in still air or a suitable quench medium, postwashing, and optional...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900071
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter begins with an overview of the history of ion nitriding. This is followed by sections that describe how the ion nitriding process works, glow discharge characteristics, process parameters requiring good control, and the applications of plasma processing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900089
EISBN: 978-1-62708-350-8
...Abstract Abstract Ion nitriding equipment falls under two categories: cold-wall continuous direct current (dc) technology and hot-wall pulsed dc technology. This chapter focuses on these two categories along with other important considerations for ion (plasma) nitriding equipment and processing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900111
EISBN: 978-1-62708-350-8
...Abstract Abstract A fluidized-bed furnace system can be used for the gas nitriding process. This chapter focuses on fluidized-bed nitriding. It discusses the methods of heating a fluidized bed. The heating system can be electrical or gas, and internal or external. The chapter describes...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900125
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter first lists the compositions of some typical nitridable steels. It then presents considerations for steel selection. The chapter also shows the influence of alloying elements on hardness after nitriding and the depth of nitriding. It provides a detailed discussion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900153
EISBN: 978-1-62708-350-8
...Abstract Abstract The nitriding process can be applied to various materials and part geometries. This chapter focuses on tool steels (hot-work tool steels, high-speed steel cutters, and gears), pure irons, low-alloy steels, and maraging steels. Various considerations such as the surface...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900163
EISBN: 978-1-62708-350-8
...Abstract Abstract Stop-off coatings prevent nitriding of selected areas on components. The success of a coating depends on such variables as density and thickness, adhesion to steel, and part surface finish. This chapter discusses the processes, advantages, and disadvantages of stop-off...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.9781627083508
EISBN: 978-1-62708-350-8
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320133
EISBN: 978-1-62708-347-8
...Abstract Abstract Nitriding is a case-hardening process used for alloy steel gears and is quite similar to case carburizing. Nitriding of gears can be done in either a gas or liquid medium containing nitrogen. This chapter discusses the processes involved in gas nitriding. It reviews...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320159
EISBN: 978-1-62708-347-8
...Abstract Abstract Several limitations in achieving optimal gear performance with conventional nitriding have led researchers to work on a variety of novel and improved nitriding processes. Of these, ion/plasma nitriding offers some promising results, which are reviewed in this chapter...
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
...Nitrides of important alloying elements for engineering alloys Table 4.1 Nitrides of important alloying elements for engineering alloys Element Nitrides Iron Fe 4 N Fe 2 N Chromium CrN Cr 2 N Molybdenum MoN Mo 2 N Tungsten WN W 2 N Aluminum AlN Titanium...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900013
EISBN: 978-1-62708-350-8
...Abstract Abstract The unique advantages of the nitriding process were recognized by the Germans in the early 1920s. It was used in applications that required: high torque, high wear resistance; abrasive wear resistance; corrosion resistance; and high surface compressive strength. This chapter...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900167
EISBN: 978-1-62708-350-8
...Abstract Abstract Examining and evaluating the nitrided case is generally accomplished by hardness testing and microscopic examination. This chapter discusses both characterization methods, as well as sample preparation. The discussion covers the process, advantages, and disadvantages...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
...Technological parameters and test results Table 3 Technological parameters and test results Steel grade Tempering temperature, °C Nitriding time, h Core hardness HV 0 .5 HV 0.5 hardness Fatigue limit (σ 1 ), MPa Residual stresses Max on cross section On surface At surface, MPa...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900031
EISBN: 978-1-62708-350-8
...Abstract Abstract Formation of the nitrided case begins through a series of nucleated growth areas on the steel surface. These nucleating growth areas will eventually become what is known as the compound layer or, more commonly, the white layer. This chapter discusses the influence of carbon...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900185
EISBN: 978-1-62708-350-8
...Abstract Abstract Problems often occur during nitriding, just as with any other heat-treatment process. They can take the form of process problems, steel problems, and machining problems. Troubleshooting is a process of elimination and plain detective work. One must be both observant...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900039
EISBN: 978-1-62708-350-8
...Abstract Abstract This chapter provides a discussion on nitriding furnace equipment and their control systems. The discussion covers the essential design criteria of the furnace, types of nitriding furnaces, insulation for the reduction of furnace heat losses, and factors influencing furnace...