| 单词 | blue heat |
| 释义 | > as lemmasblue heat blue heat n. chiefly Metallurgy a temperature at which iron or steel assumes a bluish tint as a result of becoming covered with a film of iron oxide, typically about 300°C; frequently figurative. ΘΚΠ society > occupation and work > industry > working with specific materials > working with metal > [noun] > specific temperatures in metalworking blue heat1793 cherry-red1802 recrystallization temperature1907 1793 J. Smeaton Narr. Edystone Lighthouse (ed. 2) §328 The iron came to about, or rather above, a blue heat. 1849 D. G. Rossetti in M. Rossetti Dante Gabriel Rossetti: Family-lett. (1895) II. 78 Where the waters run They have the sky sunk into them—a bath Of still blue heat. 1885 Mech. Engineer 30 May 130/2 When again drawn out of the furnace it was seen that the heat was not at all uniform, one end being of a dark red or nearly black heat, which gradually cooled to a blue heat at the other end. 1899 H. W. Sherratt Mexican Vistas xxv. 252 I looked at the lake swimming in the blue heat, and my decision was made. 1916 W. Kent Mech. Engineers' Pocket-bk. (ed. 9) 482 The fact that wrought iron is injured by working at a blue heat was reported by Stromeyer. 1998 C. Anderson Cherish 172 He stared at the base of the dancing flames where blue heat shimmered. 2000 G. F. Schrader Manufacturing Processes & Materials (ed. 4) vi. 97/1 This low toughness commonly obtained from tempering at 204–371° C (400–700° F) is called blue brittleness or blue heat phenomenon. < as lemmas |
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