spheroidizev.
/ˈsfɪərɔɪdʌɪz/ Metallurgy.
a. intransitive. Of grains, esp. of graphite in cast iron or steel: to undergo conversion into spheroids.
ΘΚΠ
society > occupation and work > materials > derived or manufactured material > metal > metal in specific state or form > [verb (intransitive)] > spheroidize or polygonize
spheroidize1912
polygonize1949
1912 in A. Sauveur Metallogr. Iron & Steel App. ii. 6 On long heating the pro-eutectoid and pearlitic cementite spheroidize slowly, and neighboring particles merge.
1936 G. F. C. Gordon Elem. Metall. (ed. 2) ix. 125 The effect of annealing hyper-eutectoid steel, if done with great care, is to cause the network of free cementite to ‘spheroidise’.
1939 E. C. Rollason Metall. for Engineers viii. 112 Prolonged annealing induces greater ductility at the expense of strength, owing to the tendency of the cementite in the strained pearlite to ‘ball-up’ or spheroidize.
b. transitive. To convert (grains) into spheroids.
ΘΚΠ
society > occupation and work > industry > working with specific materials > working with metal > work with metal [verb (transitive)] > harden, temper, or anneal > sorbitize, spheroidize, or normalize
normalize1902
sorbitize1918
spheroidize1918
1918 Jrnl. Iron & Steel Inst. 97 433 The cementite is completely spherodised [sic] into round-shaped globules.
1958 Times Rev. Industry July 48/3 The high carbon chrome tubes..have to be ‘spheroidized’ to get them into a good machinable condition.
1978 Nature 20 July 237/1 One hypothesis is that the BeO particles were spheroidised (grain refining agents should be angular and sharp-cornered) either during the hot isostatic pressing or during the time when molten.
Derivatives
spheroidiˈzation n. the process of converting to spheroids.
ΘΚΠ
society > occupation and work > industry > working with specific materials > working with metal > [noun] > hardening, tempering, or annealing > spheroidization or polygonization
spheroidizing1912
spheroidization1920
polygonization1948
1920 Jrnl. Iron & Steel Inst. 102 267 The temperature interval of spheroidisation in low carbon steels is very small, extending only to about 20°.
1944 E. Gregory & E. N. Simons Heat-treatm. Steel xv. 181 The reheating temperature is below the lower critical or transformation point, as in the spheroidization of the carbide particles in high carbon tool steels.
1977 Industr. & Engin. Chem. Process Design & Devel. 16 108/1 The process involves the melting and spheroidization of 44–125-μ magnetite grit.
ˈspheroidized adj.
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society > occupation and work > industry > working with specific materials > working with metal > [adjective] > pre-precipitation in alloys > spheroidized
spheroidized1912
society > occupation and work > materials > derived or manufactured material > metal > metal in specific state or form > [adjective] > form of grain of metals
spheroidized1912
polygonized1950
1912 A. Sauveur Metallogr. Iron & Steel xii. 15 Spheroidized pearlite is softer, less tenacious, and more ductile than lamellar pearlite.
1939 E. C. Rollason Metall. for Engineers viii. 118 During subsequent hardening operations the time required to dissolve fine spheroidised cementite is less than for the lamellar type.
1967 A. H. Cottrell Introd. Metall. xx. 384 Above about 500°C the cementite particles grow competitively..into larger rounded particles dispersed through the B.C.C. iron matrix, giving a spheroidized structure (Sorbite).
ˈspheroidizing n.
ΘΚΠ
society > occupation and work > industry > working with specific materials > working with metal > [noun] > hardening, tempering, or annealing > spheroidization or polygonization
spheroidizing1912
spheroidization1920
polygonization1948
1912 A. Sauveur Metallogr. Iron & Steel xii. 15 It may well be asked whether..the spheroidizing of pearlite is due to excessively slow cooling.
1923 R. Glazebrook Dict. Appl. Physics V. 341/1 Pearlite which has undergone spheroidising is known as granular pearlite.
1958 Times Rev. Industry July 48/3 To soften them they are heat treated in spheroidizing furnaces.
This entry has not yet been fully updated (first published 1986; most recently modified version published online September 2018).
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