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grain morphology

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Image
Published: 01 December 2000
Fig. 9.4 Macrograph of a multidirectional beta grain morphology in a Ti-6Al-4V gas-tungsten arc weld. 30× More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.tpmpa.t54480031
EISBN: 978-1-62708-318-8
... Abstract This chapter describes the structures, phases, and phase transformations observed in metals and alloys as they solidify and cool to lower temperatures. It begins with a review of the solidification process, covering nucleation, grain growth, and the factors that influence grain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420429
EISBN: 978-1-62708-310-2
..., cellular, and dendritic growth, the basic freezing sequence for an alloy casting, and the variations in cooling rate, heat flow, and grain morphology in different areas of the mold. It also describes the types of segregation that occur during freezing, the effect of solidification rate on secondary...
Image
Published: 01 December 2016
Fig. 1.11 Morphology of the dendrite grains in cast part as affected by liquid alloy treatment. (a) Columnar dendrite grains before refinement. (b) Equiaxed dendrite grains after refinement only by cooling rate increase and (c) by grain refiner addition More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190001
EISBN: 978-1-62708-296-9
... grains and the process by which they form. It describes how cooling rates, temperature gradients, and local concentrations influence the topology of the crystallization front, and how they play a role in determining the morphology and dispersion degree of the grains observed in cross sections of cast...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560185
EISBN: 978-1-62708-291-4
..., and hypereutectoid steels. It discusses the factors that influence the kinetics of the process, including carbon diffusion and the morphology of the original structure. It describes the nucleation and growth of austenite grains, the effect of grain size on mechanical properties, and the difference between coarse...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280091
EISBN: 978-1-62708-267-9
..., the objectives of forging may include grain refinement, control of second-phase morphology, controlled grain flow, and the achievement of specific microstructures and properties. The chapter explains how these objectives can be met by managing work energy via temperature and deformation control. It also...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410113
EISBN: 978-1-62708-265-5
... in steels often have a plate or needlelike shape. This morphology is termed Widmanstätten, in honor of the French scientist Alois de Widmanstätten. In the Dubé system, such crystals are referred to as Widmanstätten side plates. Primary side plates grow directly from grain boundaries, as shown in Fig. 7.1(b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850410
EISBN: 978-1-62708-260-0
.... It provides examples showing how the various features appear, how they are measured, and how the resulting data are converted into usable form. The chapter also discusses the quantification of fracture morphology and its correlation with material properties and behaviors. grain morphology grain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410001
EISBN: 978-1-62708-265-5
... This chapter provides perspective on the physical dimensions associated with the microstructure of steel and the instruments that reveal grain size, morphology, phase distributions, crystal defects, and chemical composition, from which properties and behaviors derive. The chapter also reviews...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220193
EISBN: 978-1-62708-259-4
... martensite and bainite. It also discusses the formation of austenite, the control and measurement of austenitic grain size, the characteristics of ferritic microstructures, and the methods used to classify ferrite morphology. austenite austenite decomposition austenitic grain size bainite carbon...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280025
EISBN: 978-1-62708-267-9
... also are known as geometrically close-packed (gcp) phases. In addition to grain size and morphology, (plus occasional cold work) it is the production and control (manipulation) of the various phases that give superalloys their unique characteristics. The superalloys derive their strength mostly...
Image
Published: 01 August 2018
morphology in the prior austenitic grain boundaries and fine pearlite inside the grains. Etchant: nital 4%. Courtesy of Villares Metals S.A., SP, Brazil. More
Image
Published: 01 December 2016
Fig. 1.3 Endogenous dendrite grains of αAl solid solution. (a) Dendrite grains and visible dendrite axis: primary and those of next orders. (b) Morphology of the dendrite branches. Scanning electron microscopy (SEM) More
Image
Published: 01 December 2016
Fig. 1.2 Cast part cross section showing macrostructure and morphology of crystallites. K, columnar dendrites, exogenous solidification; E, equiaxed grains, endogenous solidification; F, zone of the small frozen grains. Source: Ref 6 , 7 More
Image
Published: 01 August 1999
Fig. 8.8 (Part 2) (e) Austenitized for 1 h at 1350 °C, cooled at 300 °C/h. Austenite grain size: ASTM No. 00. 180 HV. Picral. 100×. (f) The Dubé classification of ferrite morphologies. (g) 0.4% C steel that has been austenitized at 1400 °C and cooled quickly enough to transform to lath More
Image
Published: 01 September 2005
at 119×. (c) Morphology in the large-grain base material at the same magnification as (b), showing intergranular brittle fracture features. Scanning electron micrograph. Original magnification at 119×. (d) Metallographic image showing the weak grain-boundary phase in the weld. Potassium dichromate etch More
Image
Published: 01 August 1999
Fig. 1 Comparison of pitting and intergranular corrosion morphologies. (a) Pitting-type corrosion in the surface of an aircraft wing plank from an alloy 7075–T6 extrusion. (b) Intergranular corrosion in alloy 7075–T6 plate. Grain boundaries were attacked, causing the grains to separate. Both More
Image
Published: 01 August 1999
) Austenitized for 1 h at 1350 °C, cooled at 300 °C/h. Austenite grain size: ASTM No. 00. 180 HV. Picral. 100×. (f) The Dubé classification of ferrite morphologies. (g) 0.4% C steel that has been austenitized at 1400 °C and cooled quickly enough to transform to lath martensite (see discussion of Fig. 9.17 More
Image
Published: 01 August 1999
) Austenitized for 1 h at 1350 °C, cooled at 300 °C/h. Austenite grain size: ASTM No. 00. 180 HV. Picral. 100×. (f) The Dubé classification of ferrite morphologies. (g) 0.4% C steel that has been austenitized at 1400 °C and cooled quickly enough to transform to lath martensite (see discussion of Fig. 9.17 More