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nitrided layers

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... Abstract This chapter discusses the various factors influencing the evaluation of fatigue fracture of nitrided layers. It begins by describing the problems of enhancing the fatigue resistance of machine components. The significance and detailed assessment of the effect of a structural flaw...
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Published: 01 November 2007
Fig. 4.25 Intergranular cracking in the nitrided layer of an alloy steel (0.12C-5.6Cr-0.42Mo) after exposure to the synthesis gas inside the converter at 325 atm and 450 to 500 °C (840 to 930 °F) for 4380 h. Source: Ref 43 More
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Published: 01 November 2007
Fig. 14.16 Cracks developed in the nitrided layer formed in Type 304 due to external stresses and accelerated nitridation attack in front of the crack. Source: Ref 11 More
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Published: 01 December 2003
Fig. 2 Micrographs of white nitride layers developed on vacuum-melted AMS 6470 steel. (a) White layer 0.033 mm (0.0013 in.) thick formed after single-stage nitriding at 525 °C (975 °F) for 60 h with 28% dissociation. Buildup of white layer at corner was 0.084 mm (0.0033 in.). (b) White layer More
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Published: 01 August 2005
Fig. 2.22 SEM images of (a) intergranular fracture in ion-nitrided layer of ductile iron (ASTM 80-55-06), (b) transgranular fracture by cleavage in ductile iron (ASTM 80-55-06), and (c) ductile fracture with equiaxed dimples from microvoid coalescence around graphite nodules in a ductile iron More
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Published: 01 September 2008
Fig. 42 (a) Microstructure of working regions of valve forging die in Fig. 41 (region A). Note the intense cracking and thick nitrided layer (double the expected). Also note the surface white layer, which corresponds to brittle untempered martensite, obtained by rehardening of the tool More
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Published: 01 September 2008
(in a) the problems of a coarse white layer and nitrides on grain boundaries. (c) and (d) Extracted from a die-casting die failure analysis, also for surface and core respectively. Note the strong precipitation on grain boundaries in (c), whereas core regions are quite well heat treated (to approximately 44 HRC More
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Published: 01 December 2003
Fig. 13 Same material and heat treating conditions as described in Fig. 12 , except nitrided 36 h. The depth of the nitride layer has increased, and platelets of iron nitride can be seen in the case. 2% nital. 400× More
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Published: 01 November 2007
Fig. 4.29 Optical micrographs showing typical nitride morphology of a surface nitride layer that formed on the alloy surface when exposed to NH 3 (100% NH 3 in the inlet gas and 30% NH 3 in the exhaust) for 168 h at 650 °C (1200 °F) for (a) Type 446, (b) Type 304, (c) alloy 600, (d) alloy More
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Published: 01 October 2011
Fig. 41 Effective indentation modulus, which depends on the indentation depth, of a 1.06 μm thick silicon nitride layer ( E = 137 GPa), optical glass BK7 ( E = 82 GPa), and silicon ( E = 164 GPa). The measurements were carried out by means of a Berkovich indenter that was accommodated More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.htgpge.t67320159
EISBN: 978-1-62708-347-8
...Results after ion nitriding of common gear materials Table 7.1 Results after ion nitriding of common gear materials Steel group Core hardness, HRC Nitriding temperature, °C (°F) Surface hardness, 15N scale Total case depth, mm (in.) Thickness of white layer, mm × 10 –4 (in. × 10 –4...
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Published: 01 January 2015
Fig. 21.42 White layer and diffusion zone in nitrided steel. Steel is Nitralloy 135 Modified containing 0.4% C, 1.6% Cr, 0.35% Mo, and 1.13% Al. Base microstructure is tempered martensite of hardness 30 HRC. Etched in 1.5% nital. Original magnification at 500x. Courtesy of D. Stratford More
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Published: 01 September 2008
Fig. 37 Tool steel surface after nitriding. (a) White and diffusion layers (b) Coarse nitrides precipitated on grain boundaries. See text for discussion. Courtesy of Villares Metals More
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Published: 01 December 2003
Fig. 2 Typical nitrided case structure showing the white layer (top), the diffusion zone, and the core below the diffusion zone. Source: Ref 1 More
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Published: 01 September 2005
Fig. 2 Typical nitrided case structure showing the white layer (top), the diffusion zone, and the core below the diffusion zone More
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Published: 01 November 2013
Fig. 26 Effect of one- and two-stage nitriding on white layer. (a) Single stage, gas nitrided for 24 h at 525 °C (975 °F). (b) Double stage, gas nitrided for 5 h at 525 °C (975 °F) followed by second stage at 565 °C (1050 °F) for 24 h. Original magnification: 400×. Source: Ref 13 More
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Published: 01 June 2008
Fig. 21.9 Effect of one- and two-stage nitriding on white layer. (a) Single stage, gas nitrided for 24 h at 525 °C (975 °F). (b) Double stage, gas nitrided for 5 h at 525 °C (975 °F) followed by second stage at 565 °C (1050 °F) for 24 h. Original magnification: 400×. Source: Ref 1 More
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
... in. 2–5 1.524 0.060 0.381 0.015 6–10 1.270 0.050 0.254 0.010 12–20 0.762 0.030 0.127 0.005 Double-stage gas nitriding cycles Table 5 Double-stage gas nitriding cycles Steel Cycle Effective case depth at 50 HRC Maximum white layer thickness Minimum hardness...
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
... containing both aluminum and titanium are strengthened by γ′ phase, Ni 3 (Al,Ti). For these alloys, nitridation by forming internal nitrides of aluminum and titanium can deplete the surface layer with aluminum and titanium, thus weakening the alloy. Under a high-velocity combustion gas stream with severe...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240395
EISBN: 978-1-62708-251-8
..., hard cases < 25 μm (1 mil); no white layer; most are proprietary processes Ion 345–565 650–1050 75–760 3–30 50–70 Alloy steels, nitriding steels, stainless steels Faster than gas nitriding; no white layer; high equipment costs; close case control Nitriding is conducted...