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austenite-to-pearlite transformation

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Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006300
EISBN: 978-1-62708-179-5
... untransformed volume. The article describes the austenite decomposition to ferrite and pearlite in spheroidal graphite irons and lamellar graphite irons. It provides a discussion on modeling austenite decomposition to ferrite and pearlite. austenite decomposition austenite-to-pearlite transformation...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006343
EISBN: 978-1-62708-179-5
... precipitated from the liquid melt. The article describes the macrostructure and dendrite morphology of primary austenite. Eutectoid transformation in the solid state causes the transformation of austenite to pearlite and/or ferrite, producing the as-cast structure. The article discusses the observations...
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006228
EISBN: 978-1-62708-163-4
... the eutectoid temperature (point d ), all of the remaining austenite transforms to pearlite. Because this reaction does not really affect the proeutectoid ferrite that has already formed at the austenite grain boundaries, the final microstructure is one of pearlite within the grain interiors surrounded...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005819
EISBN: 978-1-62708-165-8
... as steel composition, temperature of transformation, and cooling rate. Several factors determine the rates of austenite decomposition into pearlite, bainite, primary ferrite, primary cementite, or martensite. The rates depend strongly on temperatures and whether cooling is rapid or slow, because...
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001008
EISBN: 978-1-62708-161-0
... entirely to pearlite over a range of temperatures well below 727 °C (1340 °F). Figure 4 was produced by cooling the steel rapidly to a series of temperatures below A 1 , holding at those temperatures, and then following, as a function of time, the transformation of austenite to pearlite. An incubation...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003723
EISBN: 978-1-62708-177-1
... 3000× Fig. 18 Schematic of proeutectoid and eutectoid (pearlite) formation from austenite transformation in slowly cooled steels. (a) Hypoeutectoid steels. (b) Hypereutectoid steels Fig. 19 Different appearance of ferrite and cementite (Fe 3 C) constituents of pearlite when examined...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005786
EISBN: 978-1-62708-165-8
... the transformation kinetics are less inhibited by the need for long-range solute transport. Fine eutectoid pearlite is a relatively simple case to consider, whereby austenite is stable just above the eutectoid temperature, and carbon redistribution is needed only on the scale of the pearlite interlamellar spacing...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006305
EISBN: 978-1-62708-179-5
... sections. Data from these studies of CCT kinetics have also been analyzed by multiple linear regression analysis to determine the effects of individual alloying elements on delaying the transformation of austenite to pearlite. These results are listed in Table 6 . Optimal performance is usually...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005988
EISBN: 978-1-62708-168-9
... regression analysis to determine the effects of individual alloying elements on delaying the transformation of austenite to pearlite. These results are listed in Table 6 . Martensitic structures can be obtained as-cast in heavy section castings which cool slowly in the mold. With slow cooling rates...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005922
EISBN: 978-1-62708-166-5
... sufficient ductility for subsequent cold forming by wire drawing or rolling. This can be achieved only if the austenitizing and cooling temperatures in the pearlite transformation region are maintained within very tight tolerances. Patenting Process Parameters Benefits of Using a Lead Bath...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005859
EISBN: 978-1-62708-167-2
... discusses the various aspects of steel heat treatment by induction processing, and concludes with a description of steel alloys for induction processing. austenitizing continuous cooling transformation diagram induction hardening iron-carbon system steel time temperature transformation diagram...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003734
EISBN: 978-1-62708-177-1
... that ledges span both cementite (C) and ferrite (F) as they grow into the austenite (A). Source: Ref 10 Fig. 3 Pearlite microstructure in crucible steel ingot. Source: Ref 3 Fig. 4 Time-temperature-transformation diagram showing austenite decomposition into pearlite and bainite. Source...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005787
EISBN: 978-1-62708-165-8
... of steel, rod or wire products are uncoiled, and the strands are delivered to an austenitizing station. The strands are then cooled rapidly from above A 3 in a molten medium—usually lead at approximately 540 °C (1000 °F)—for a period of time sufficient to allow complete transformation to a fine pearlitic...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003090
EISBN: 978-1-62708-199-3
... temperature. Source: Ref 20 Fig. 24 Relationship between transformation temperature and tensile strength of ferrite-pearlite, bainitic, and martensitic steels. Source: Ref 5 Fig. 25 Relationship between bainite lath width (grain size) and yield strength. Source: Ref 5 Fig. 26...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003201
EISBN: 978-1-62708-199-3
... Austenitizing Quenching Tempering Flame Hardening Induction Hardening Temperature of stress relieving is usually well below the range for the transformation of pearlite to austenite. For a maximum relief of stress with a minimum of decomposition of carbide in unalloyed irons, a temperature...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005810
EISBN: 978-1-62708-165-8
... a significant effect on the time at which transformation begins. As the austenitizing temperature is increased above normal (for a specific steel), the pearlitic nose of the TTT curve can shift to the right because of grain coarsening, or (in hypereutectoid steels) increased carbon in solution...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005327
EISBN: 978-1-62708-187-0
... and grinding. In these martensitic white irons, nickel is the primary alloying element because, at levels of 3 to 5%, it is effective in suppressing the transformation of the austenite matrix to pearlite, thus ensuring that a hard, martensitic structure (usually containing significant amounts of retained...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005937
EISBN: 978-1-62708-168-9
.... This deterioration in properties is likely caused by the segregation of Mo to cell boundaries and the formation of carbides. The level of Mo should be restricted to not more than 0.30% in heavy section castings. Source: Ref 4 Fig. 18 Time to 5% transformed for a low-alloy ductile iron austenitized...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006322
EISBN: 978-1-62708-179-5
... as the γ is enriched with carbon during stage I Fig. 3 Optical micrographs of ductile iron. (a) Ferritic matrix produced by intercritically austenitizing at 732 °C (1350 °F) for 5 h, cooling 10 °C (18 °F) per hour to 538 °C (1000 °F), and then air cooling. (b) Fine pearlite in normalized ductile...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003765
EISBN: 978-1-62708-177-1
... depending upon substitution of elements for Fe; imparts wear resistance; reduces machinability Pearlite A metastable lamellar aggregate of ferrite and cementite due to eutectoidal transformation of austenite above the bainite region. Contributes strength without brittleness; has good machinability...