| 单词 | hairline crack |
| 释义 | > as lemmashairline crack 7. Metallurgy. In full hairline crack: see quot. 1949. ΘΚΠ society > occupation and work > materials > derived or manufactured material > metal > qualities of metals > [noun] > imperfections honeycomb1530 roll mark1894 hair crack1896 season crack1909 season cracking1910 snowflake1919 hairline crack1923 shrinkage cavity1923 clink1925 shatter crack1930 stretcher strain1931 pimpling1940 stringer1942 quench cracking1949 1923 J. A. Jones Woolwich Res. Dept. Rep. no. 55 51 The occurrence of hair-line cracks at one end of the forgings suggests that trouble might be experienced. 1925 Jrnl. Iron & Steel Inst. 111 113 A defect known as snow-flakes or flakes (America), hair-cracks or hair-lines (Great Britain), Flocken (Germany), and cassures ligneuses (France), has received much attention among manufacturers and inspectors of alloy steel forgings. 1949 R. T. Rolfe Dict. Metallogr. (ed. 2) 121 Hair-line cracks (or hair c[racks]), (1) very fine short cracks occurring in the interior of some steel forgings which have not been allowed to cool sufficiently slowly from the working temperature... (2) The term is also applied to any fine cracks which may occur in metals and alloys. 1962 G. R. Bashforth Manuf. Iron & Steel IV. ii. 31 When once this [hydrogen-rich] constituent has been formed, its breakdown at low temperatures must result in the formation of hairline cracks, but hairline cracks will not be formed if the breakdown..is brought about at higher temperatures. 1968 Times 28 Aug. 21/6 The South of England Electricity Board has had to take its newest..power station..out of commission because of a discovery..of hair-line cracks in welding. < as lemmas |
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