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Widmanstatten ferrite

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410113
EISBN: 978-1-62708-265-5
... ferrite, Widmanstatten ferrite, quasi-polygonal or massive ferrite, acicular ferrite, and granular ferrite. acicular ferrite cooling rate Dube classification system ferrite granular ferrite microstructure polygonal ferrite quasi-polygonal ferrite Widmanstatten ferrite THIS CHAPTER...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220193
EISBN: 978-1-62708-259-4
.... , New Insights into the Widmanstätten Proeutectoid Ferrite Transformation: Integration of Crystallographic and Three-Dimensional Morphological Observations , Metall. Mat. Trans. A , Vol 36A , May 2005 , p 1209 – 18 10.1007/s11661-005-0213-1 75. IIW , International Institute of Welding...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560005
EISBN: 978-1-62708-291-4
..., acicular ferrite, coarse acicular ferrite, fine acicular ferrite , and Widmanstätten ferrite . Mehl (in Ref 4 ) records that the characteristic Widmanstätten structure is named after Aloys Joseph Franz Xaver Beck von Widmanstätten, director of the Imperial Fabrik-Producton-Cabinet, an industrial...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
...× Fig. 2.14 A form of ferrite called Widmanstätten ferrite in a coarse-grained AISI/SAE 1025 steel. 4% picral etch. 100× Fig. 2.15 Proeutectoid ferrite (white etching network) at the prior austenite grain boundaries in an oil-quenched AISI/SAE 1060 steel. Dark etching constituent is pearlite...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
.... Therefore, films of proeutectoid ferrite form at the sites of the former austenite boundaries. If the cooling rate is fast, ferrite side-plates protrude from the proeutectoid ferrite and project into the austenite grains. These side-plates, called Widmanstätten plates, have a wedge-like shape...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560221
EISBN: 978-1-62708-291-4
... and composition in which various morphologies of ferrite and cementite are dominant after isothermal transformation. “Large grains” refers to an austenitic grain size of ASTM 0 to 1; “small grains” refers to a grain size of ASTM 7 to 8. GBA, grain-boundary allotriomorphs; W, Widmanstätten sideplates...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240153
EISBN: 978-1-62708-251-8
.... If the cooling rate is fast, ferrite side-plates protrude from the proeutectoid ferrite and project into the austenite grains. These side-plates, called Widmanstätten plates, have a wedgelike shape, and their broad faces comprise flat areas separated by ledges, as shown in Fig. 10.10 . The growth process now...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560309
EISBN: 978-1-62708-291-4
...) to (h) Reaustenitized zone in weld metal. 190 HV. (f) Arrows indicate areas of martensite. Picral. 1000×. (g) 1% nital. 100×. (h) 1% nital. 1000×. (i) Possible morphologies of ferrite in weld metal: GBA, grain-boundary allotriomorphs; SP, Widmanstätten side plates; IP, Widmanstätten...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410197
EISBN: 978-1-62708-265-5
... mechanism, on the other hand, requires no such partitioning of substitutional elements, and as a result, the lower noses for Widmanstätten ferrite and bainite (which is nucleated by ferrite) are prominent features of the CT diagram for the steel containing molybdenum. Of course, the excellent hardenability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220475
EISBN: 978-1-62708-259-4
..., close to the fusion line. Allotriomorphic ferrite in prior austenitic grain boundaries, Widmanstätten and acicular ferrite, possibly bainite (complete characterization not included on the source). (c) Region where the carbides in pearlite have suffered slight spheroidization: ferrite and slightly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560165
EISBN: 978-1-62708-291-4
... temperature, and the proeutectoid cementite nas precipitated during cooling as Widmanstätten intragranular plates as well as grain boundary allotriomorphs. 355 HV. Picral. 1000×. (f) Normalized from 950 °C, heated at 700 °C for 8 h, cooled at 100 °C/h. 240 HV. Picral. 1000×. (g) Normalized from 950 °C...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170193
EISBN: 978-1-62708-297-6
.... In general, high finishing temperatures and light deformation passes should be avoided with niobium steels because that may result in mixed grain sizes or Widmanstätten ferrite, which impair toughness. Niobium steels are produced by controlled rolling, recrystallization controlled rolling, accelerating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400087
EISBN: 978-1-62708-258-7
... by Widmanstätten and Schreibers using heavy etching in nitric acid to outline the structure in relief. The macrograph was made by rolling printer’s ink over the sample and then transferring the inked specimen onto paper. Fig. 4.3 A sketch of Beck’s microscope with Sorby’s flat mirror (g) Fig. 4.5...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... , Acta Mater. , Vol 49 , 2001 , p 41 – 51 10.1016/S1359-6454(00)00305-0 5.13 Gil F.J. , Ginebra M.P. , Manero J.M. , and Planell J.A. , Formation of Widmanstätten Structure: Effects of Grain Size and Cooling Rate on the Widmanstätten Morphologies and on the Mechanical...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
...Atomic volumes of selected microstructural constituents of ferrous alloys Table 1 Atomic volumes of selected microstructural constituents of ferrous alloys Phase Apparent atomic volume, Å 3 Ferrite 11.789 Cementite 12.769 Ferrite + carbides 11.786 + 0.163 C...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
...) g and 6.2a ); this is called grain-boundary ferrite. These are the two basic morphologies, but ferrite may also be found in the form of broad pointed needles ( Fig. 6.1 (Part 2) e ) that are sections of plates; this is the Widmanstätten morphology. The morphologies of ferrite are discussed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000025
EISBN: 978-1-62708-313-3
...; may form as intergranular precipitates or intragranular acicular platelets in a Widmanstätten pattern γ″ Body-centered tetragonal (ordered D0 22 ) a o = 0.3624 c o = 0.7406 Ni 3 Nb Principal strengthening phase in IN-718. γ″ precipitates are coherent disk-shaped particles that form on the {1...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060247
EISBN: 978-1-62708-261-7
... and (less often) fissures or gross blowing through a section. Mild chill promoter. Promotes inverse chill when insufficient manganese is present. Promotes coarse graphite Lead ≤0.005 Results in Widmanstätten and “spiky” graphite, especially in heavy sections with high hydrogen. Can reduce tensile...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.9781627083263
EISBN: 978-1-62708-326-3
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220129
EISBN: 978-1-62708-259-4
...) of a steel containing 0.14% C. The discontinuity in volume change corresponds to the shrinkage during the peritectic reaction. Calculated. Source: Ref 11 , 12 Figures 8.22 and 8.23 present the evolution of the structure as the steel solidifies. The fast transformation of ferrite in austenite...