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carburization

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080097
EISBN: 978-1-62708-304-1
... Abstract This chapter discusses the conditions under which carburization and metal dusting occur. It describes the chemical reactions and thermodynamic relationships that drive carburization and metal dusting attack and the factors that determine the amount of damage that metals and alloys...
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Published: 01 June 2008
Fig. 21.6 Comparison of carburization methods. 8620 steel carburized at 980 °C (1800 °F) for 30 min. Source: Ref 1 More
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Published: 01 December 2015
Fig. 14 Example of high-temperature carburization attack pitting in type 310 reactor wall after ~4000 h exposure to coal-gasification product gas. The pits were formed during operation under conditions of high-carbon activity in the gas. (a) Overall view of pitting. (b) Section through a pit More
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Published: 01 December 2015
Fig. 15 Effect of silicon on the carburization resistance of cast Fe-20Ni-Cr alloys tested at 1090 °C (2000 °F) for 24 h in wet ethane Source: Ref 4 More
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Published: 01 December 2001
Fig. 3 Comparison of the carburization resistance of Ni 3 Al-base alloys with that of alloy 800. (a) Oxidizing carburizing environment. (b) Reducing carburizing environment More
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Published: 01 November 2007
Fig. 5.14 Carburization resistance of HK (25Cr-20Ni) and several HP alloys (Cr/Ni) as a function of temperature in pack carburization tests. Source: Ref 32 More
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Published: 01 November 2007
Fig. 5.19 Carburization rate constants of several Fe-Ni-Cr alloys at 825 °C (1520 °F) in the test environment with a carbon activity of 0.8 and an oxygen potential such that SiO 2 is stable (but not Cr 2 O 3 ), as shown in Fig. 5.18 . Source: Ref 35 More
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Published: 01 November 2007
Fig. 5.20 Carburization rate constants as a function of silicon content in the alloy for several Fe-Ni-Cr alloys tested at 825 °C (1520 °F) in the test environment with a carbon activity of 0.8 and an oxygen potential such that SiO 2 is stable (but not Cr 2 O 3 ), as shown in Fig. 5.18 More
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Published: 01 November 2007
Fig. 5.21 Carburization rate constants of several Fe-Ni-Cr alloys at 1000 °C (1830 °F) in the test environment with a carbon activity of 0.8 and an oxygen potential such that SiO 2 is not stable as shown in Fig. 5.18 . Source: Ref 35 More
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Published: 01 November 2007
Fig. 5.22 Carburization rate constants as a function of Ni to Cr + Fe ratio [Ni/(Cr + Fe)] for several Fe-Ni-Cr alloys tested at 1000 °C (1830 °F) in the test environment with a carbon activity of 0.8 and an oxygen potential such that SiO 2 is not stable as shown in Fig. 5.18 . Source: Ref More
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Published: 01 November 2007
Fig. 5.25 Results of carburization tests in H 2 -CH 4 mixtures ( a c = 0.8) at (a) 850 °C, (b) 1000 °C, and (c) 1100 °C for Fe-Ni-Cr alloys (800H, AC66, and DS) and nickel-base alloys (alloys 600H, 601, 602CA, 617, and 45TM). Source: Ref 29 More
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Published: 01 November 2007
Fig. 5.27 Effect of nickel content on the carburization resistance of Fe-Ni-Cr alloys. Source: Ref 42 More
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Published: 01 November 2007
Fig. 5.28 Effect of chromium on the carburization resistance of Fe-Ni-Cr alloys after testing in H 2 -2.5%CH 4 at 1050 °C (1920 °F) for 100 h. Source: Ref 42 More
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Published: 01 November 2007
Fig. 5.29 Carburization resistance of several wrought and cast Fe-Cr-Ni alloys (Type 304, 321, HT, HU, and HK) after testing in dry ethane (C 2 H 6 ) for 24 h at temperatures from 880 to 1000 °C. Source: Ref 43 More
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Published: 01 November 2007
Fig. 5.30 Effect of silicon on the carburization resistance of 25Cr-20Ni and 35Cr-25Ni-Nb alloys. Source: Ref 45 More
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Published: 01 November 2007
Fig. 5.31 Effect of silicon on the carburization resistance of cast Fe-20Ni-Cr alloys tested at 1090 °C (2000 °F) for 24 h in wet ethane (C 2 H 6 ). Source: Ref 46 More
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Published: 01 November 2007
Fig. 5.32 Effect of silicon on the carburization resistance of HK-40 with different silicon levels tested at 1100 °C (2010 °F) for 520 h in carbon granulate (pack carburization test). Source: Ref 47 More
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Published: 01 November 2007
Fig. 5.37 Comparative carburization resistance of as-cast and machined tubes of alloys 30Cr-30Ni, 36X (Fe-0.4C-25Cr-34Ni-1.2Nb), and 36XS (Fe-0.4C-25Cr-34Ni-1.5Nb-1.5W) after 3 years of field testing in an ethylene pyrolysis furnace. Source: Ref 34 More
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Published: 01 November 2007
Fig. 5.38 Effect of machining on the carburization resistance of cast HK-40 alloy. Source: Ref 56 More
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Published: 01 November 2007
Fig. 5.40 Microhardness profile and optical micrograph showing severe carburization attack on the 316 specimen with the original as-received surface (solid circle data point) after testing at 649 °C (1200 °F) for 5000 h in He-1500 μatm H 2 -450 μatm CO-50 μatm CH 4 -50 μatm H 2 O. Also shown More