| 释义 |
spheroidize, v. Metallurgy.|ˈsfɪərɔɪdaɪz|
[f. spheroid n. + -ize.]
a. intr. Of grains, esp. of graphite in cast iron or steel: to undergo conversion into spheroids.
1912in A. Sauveur Metallogr. Iron & Steel App. ii. 6 On long heating the pro-eutectoid and pearlitic cementite spheroidize slowly, and neighboring particles merge. 1936G. F. C. Gordon Elem. Metallurgy (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’. 1939E. C. Rollason Metallurgy 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. trans. To convert (grains) into spheroids.
1918Jrnl. Iron & Steel Inst. XCVII. 433 The cementite is completely spherodised [sic] into round-shaped globules. 1958Times Rev. Industry July 48/3 The high carbon chrome tubes..have to be ‘spheroidized’ to get them into a good machinable condition. 1978Nature 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.
Hence ˈspheroidized ppl. a., ˈspheroidizing vbl. n.; spheroidiˈzation, the process of converting to spheroids.
1912A. Sauveur Metallogr. Iron & Steel xii. 15 It may well be asked whether..the spheroidizing of pearlite is due to excessively slow cooling. Ibid., Spheroidized pearlite is softer, less tenacious, and more ductile than lamellar pearlite. 1920Jrnl. Iron & Steel Inst. CII. 267 The temperature interval of spheroidisation in low carbon steels is very small, extending only to about 20°. 1923Glazebrook Dict. Appl. Physics V. 341/1 Pearlite which has undergone spheroidising is known as granular pearlite. 1939E. C. Rollason Metall. Engineers viii. 118 During subsequent hardening operations the time required to dissolve fine spheroidised cementite is less than for the lamellar type. 1944Gregory & Simons Heat-Treatment of 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. 1958Times Rev. Industry July 48/3 To soften them they are heat treated in spheroidizing furnaces. 1967A. H. Cottrell Introd. Metallurgy 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). 1977Industr. & Engin. Chem. Process Design & Development XVI. 108/1 The process involves the melting and spheroidization of 44–125-µ magnetite grit. |