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isothermal transformation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410197
EISBN: 978-1-62708-265-5
... Isothermal and continuous cooling transformation (CT) diagrams help users map out diffusion-controlled phase transformations of austenite to various mixtures of ferrite and cementite. This chapter discusses the application as well as limitations of these engineering tools in the context of heat...
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Published: 01 January 2015
Fig. 6.13 Isothermal transformation diagram for 4340 steel and isothermal heat treatments applied to produce various microstructures for fracture evaluation. Source: Ref 6.16 More
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Published: 31 December 2020
Fig. 6 Isothermal transformation (IT) diagram for isothermal annealing of L6 tool steel: Heat at 845 °C (1550 °F); soak to uniform austenite; cool to 650 °C (1200 °F); hold 2 hours at 650 °C (1200 °F); annealed structure of ferrite carbide; cool to room temperature. More
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Published: 01 March 2012
Fig. 15.37 Isothermal transformation diagram for 4340 steel and isothermal heat treatments applied to produce various microstructures for fracture evaluation. Source: Ref 15.24 as published in Ref 15.19 More
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Published: 01 August 1999
Fig. 9.6 (Part 1) Lower bainite formation (at 300 °C) in isothermal transformation of 0.8% C eutectoid steels. 0.81 C-0.07Si-0.65Mn (wt%). (a) Austenitized at 860 °C, transformed at 300 °C for 70 s. Picral. 250×. (b) Austenitized at 860 °C, transformed at 300 °C for 200 s. Picral. 250 More
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Published: 01 August 1999
Fig. 9.9 (Part 1) Proeutectoid ferrite and pearlite formation in isothermal transformation of 0.55% C hypoeutectoid steels. 0.55C-0.08Si-0.60Mn (wt%). (a) Austenitized at 860 °C, transformed at 705 °C for 20 s. Picral. 500×. (b) Austenitized at 860 °C, transformed at 705 °C for 2 min More
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Published: 01 August 1999
Fig. 9.9 (Part 2) Proeutectoid ferrite and pearlite formation in isothermal transformation of 0.55% C hypoeutectoid steels. 0.55C-0.08Si-0.60Mn (wt%). (g) Austenitized at 860 °C, transformed at 550 °C for 15 s. 320 HV. Picral. 500×. (h) Austenitized at 860 °C, transformed at 500 °C for 5 s More
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Published: 01 August 1999
Fig. 9.10 (Part 1) Isothermal transformation of a partly austenitized 0.55% C hypoeutectoid steels. 0.55C-0.08Si-0.60Mn (wt%). (a) Normal austenitic grain size (parent structure similar to that shown in Fig. 9.9 (Part 1) f ). Austenitized at 730 °C, transformed at 20 °C, water quenched from More
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Published: 01 August 1999
Fig. 9.11 (Part 1) Proeutectoid ferrite and pearlite formation in isothermal transformation of hypoeutectoid steels. Micrographs of a 0.8% C steel transformed at these two temperatures are given in Fig. 9.1 . (a) and (b) 0.15% C (0.17C-0.06Si-0.41 Mn, wt%). (a) Austenitized at 925 °C More
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Published: 01 August 1999
Fig. 9.11 (Part 2) Proeutectoid ferrite and pearlite formation in isothermal transformation of hypoeutectoid steels. Micrographs of a 0.8% C steel transformed at these two temperatures are given in Fig. 9.1 . (a) and (b) 0.15% C (0.17C-0.06Si-0.41 Mn, wt%). (a) Austenitized at 925 °C More
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Published: 01 August 1999
Fig. 9.13 (Part 1) Isothermal transformation of a low-carbon (0.25% C) hypoeutectoid steel. The structure before austenitization is shown in Fig. 6.1 (c) and (d) . 0.23C-0.06Si-0.52Mn (wt%). The transformation products formed at 705 °C and 650 °C are shown in Fig. 9.11 (c) and (d More
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Published: 01 August 1999
Fig. 9.14 (Part 1) Isothermal transformation of a partly austenitized low-carbon (0.25%) hypoeutectoid steel. The structure before austenitization is shown in Fig. 6.1 (c) and (d) . 0.23C-0.06Si-0.52Mn (wt%). (a) Austenitized at 750 °C, water quenched, isothermally transformed at 20 °C More
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Published: 01 August 1999
Fig. 9.15 Pearlite formation in isothermal transformation of aluminum-deoxidized hypoeutectoid steels. (a) 0.4% C, silicon deoxidized (0.39C-0.19Si-0.73Mn, wt%). Austenitized at 840 °C, isothermally transformed at 695 °C. 150 HV. ASTM grain size No. 4-5. Picral. 1000×. (b) to (d) 0.4% C More
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Published: 01 August 1999
Fig. 9.16 Upper bainite formation in isothermal transformation of hypoeutectoid steels. See Fig. 9.4 for illustration or the structure of bainites formed at 450 and 400 °C in a 0.8% C steel. The transformation products formed in these steels at higher temperatures are shown in Fig. 9.11 More
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Published: 01 August 1999
Fig. 9.25 (Part 1) Proeutectoid cementite and pearlite formation in isothermal transformation of 1.2% C hypereutectoid steels. 1.18C-0.19Si-0.25Mn (wt%). (a) Austenitized at 960 °C, transformed at 705 °C for 5 s. Picral. 500×. (b) Austenitized at 960 °C, transformed at 705 °C for 30 s More
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Published: 01 January 2015
Fig. 4.3 Isothermal transformation diagram for 1080 steel containing 0.79% C and 0.76% Mn. Specimens were austenitized at 900 °C (1650 °F) and had an austenite grain size of ASTM No. 6. Source: Ref 4.7 More
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Published: 01 January 2015
Fig. 5.10 Isothermal transformation curves for martensite formation in an Fe-23 Ni-3.6 Mn alloy. Curves are identified by the percentage of martensite formed. Source: Ref 5.32 More
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Published: 01 January 2015
Fig. 6.14 Impact energy absorbed as a function of isothermal transformation temperature for specimens of 4340 steel. E 0 is total energy absorbed, E 1 is fracture initiation energy, and E 2 is fracture propagation energy. Source: Ref 6.16 More
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Published: 01 January 2015
Fig. 7.13 Acicular ferrite formed by isothermal transformation of a copper-containing HSLA-80 steel transformed for 5000 s at 500 °C (930 °F). Light micrograph, nital etch. Courtesy of M. Kumar, Colorado School of Mines More
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Published: 01 January 2015
Fig. 10.1 Relationship to (a) iron-carbon diagram of isothermal transformation diagrams of (b) eutectoid steel and (c) steel containing 0.5% C. The regions in (a) identified as N, FA, and S are temperature ranges for normalizing, full annealing, and spheroidizing heat treatments, respectively More