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polygonization

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003784
EISBN: 978-1-62708-177-1
...Abstract Abstract Pure metals normally solidify into polycrystalline masses, but it is relatively easy to produce single crystals by directional solidification from the melt. This article illustrates the dislocations present in a metal crystal, which is often polygonized into sub-boundaries...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006284
EISBN: 978-1-62708-169-6
... of the polygonized subgrains. See text for detailed explanation. Source: Ref 5 Fig. 10 Fine-grained commercial-purity aluminum, cold rolled 90% and heated in a high-voltage electron microscope at 264 °C (507 °F) for 480 s. Recrystallized grains (denoted by letters) nucleated at a large FeAl 3 particle...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004019
EISBN: 978-1-62708-185-6
... (750 °F) for 1280 min. Reduced dislocation density and random arrays of dislocations are evident. (c) Annealed at 600 °C (1110 °F) for 1280 min. Well-defined subgrains resulting from polygonization are shown. (d) Annealed at 800 °C (1470 °F) for 5 min. Increased average diameter of the subgrains is due...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003743
EISBN: 978-1-62708-177-1
... in the as-rolled condition. (b) Annealed at 400 °C (750 °F) for 1280 min. Reduced dislocation density and random arrays of dislocations are evident. (c) Annealed at 600 °C (1110 °F) for 1280 min. Well-defined subgrains resulting from polygonization are shown. (d) Annealed at 800 °C (1470 °F) for 5 min. Increased...
Series: ASM Handbook
Volume: 4D
Publisher: ASM International
Published: 01 October 2014
DOI: 10.31399/asm.hb.v04d.a0005962
EISBN: 978-1-62708-168-9
... with or without pearlite colonies, polygonal ferrite, acicular ferrite, granular ferrite, Widmanstätten ferrite, bainitic ferrite, and martensitic ferrite. However, certain grades of this class of steel can have a microstructure that is predominantly tempered martensite or bainite if, in addition to carbon...
Book Chapter

By P.S. Grant
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005225
EISBN: 978-1-62708-187-0
... casting arise through the unusual solidification conditions and are manifest in the microstructure through: Equiaxed/polygonal grains of diameter typically in the range of 20 to 50 μm and the absence of columnar/dendritic grain morphologies High levels of microstructural homogeneity and low...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000625
EISBN: 978-1-62708-181-8
... , 1259 , and 1260 . The transition is thought to be brought about by strain-induced grain-boundary migration and polygonization. Polygonization promotes brittle behavior by increasing the effective stress concentration at grain boundaries. Samples were isothermally annealed for 30 min and then tensile...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003721
EISBN: 978-1-62708-177-1
... for polygon distribution ensures better sampling for size (see Ref 36 , 37 , 38 ). Quantitative description of grain shape in three dimensions ( Ref 41 ) may be approximated by a sphere when the average shape of grains are equiaxed. Similarly, nonequiaxed grains may be represented by ellipsoids. When...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003730
EISBN: 978-1-62708-177-1
...-hardened systems. Orientation relationships can characterize specific transformations, such as martensite or pearlite. Polygonized structures resulting from cold work followed by annealing Dislocation networks resulting from cold work or shear-type (martensite) transformations Solute...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001343
EISBN: 978-1-62708-173-3
... in low-carbon steel welds Microconstituent Description Primary Ferrite  Grain boundry ferrite Proeutectoid ferrite that grows along the prior austenite grain boundaries. It is equiaxed or polygonal, and it may occur in veins  Intragranular polygonal ferrite Polygonal ferrite...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005233
EISBN: 978-1-62708-187-0
...; that is, heterogeneous structures are divided into small elements, each of which is approximated as homogeneous. For example, using the FEM, a circle can be represented by a circumscribed polygon, where each side of the polygon is a finite element. Similar to FVMs, the computational domain is subdivided into either...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003995
EISBN: 978-1-62708-185-6
... steels, which are essentially fine-grained, precipitation-strengthened polygonal ferrite microstructures. In bainitic steels, the key to high toughness is to decrease the carbon level, leading to carbide-free bainites that exhibit excellent strength and impact toughness. Even with these steels, the basic...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006487
EISBN: 978-1-62708-207-5
... partial annealing; in the latter, some recrystallization may occur, whereas in the former, recovery only is used to achieve the required properties, accomplished by substructural changes in dislocation density and rearrangement into cellular patterns (polygonization). Bendability and formability...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006250
EISBN: 978-1-62708-169-6
... and dislocations, their presence decreases the mobility of the defects. One of the key processes of dislocation rearrangement is polygonization, which is the process of rearranging excess edge dislocations into low-angle tilt boundaries. The driving force for polygonization is a reduction in the total strain...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003785
EISBN: 978-1-62708-177-1
... at austenite grain boundaries and often results in a grain-boundary film is classified as grain-boundary ferrite ( Fig. 19 ). Proeutectoid ferrite that nucleates intragranularly is classified as polygonal ferrite ( Fig. 20 ). Upper bainite and Widmanstätten ferrite are classified as ferrite with aligned second...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005422
EISBN: 978-1-62708-196-2
..., they are rather complicated and quire substantial computational efforts ( Ref 43 ). The numerical alternative is the use of tessellations. A tessellation (also called mosaic) is a regular arrangement of polygons (2-D) (regular in the sense that there are no gaps or overlaps between the elements...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006053
EISBN: 978-1-62708-175-7
... press with a robotic part-handling system. Simple metal-cutting insert shapes are typically round or polygonal with straight walls, with or without a central hole. They are produced in straight-wall dies with single-action tooling and a core rod for the central hole ( Fig 5 ). Green density...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005236
EISBN: 978-1-62708-187-0
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005406
EISBN: 978-1-62708-196-2
... zone from a cell ν to a cell μ. Within one time step, the four half-diagonals associated to the shape of cell ν have grown from center G ν . As a result, the mushy zone has extended from the polygon delimited by the white continuous thin lines to the polygon delimited by the black continuous thin...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003761
EISBN: 978-1-62708-177-1
...× Fig. 2 Microstructure of equiaxed (polygonal) ferrite and pearlite (dark) in a low-carbon steel. 500× Fig. 3 Microstructure of a cold-rolled, low-carbon steel sheet showing ferrite grains at (a) 30%, (b) 50%, (c) 70%, and (d) 90% cold reduction. Marshall's reagent. 500× Fig. 4...