| 单词 | secondary hardness |
| 释义 | > as lemmassecondary hardness j. secondary hardening (Metallurgy): a further hardening which occurs in some previously hardened steels when they are tempered; so secondary hardness. ΘΚΠ the world > matter > constitution of matter > hardness > [noun] hardnessOE hardinessa1398 obdurityc1600 marblenessa1631 durity1646 unimpressibility1854 flintiness1871 secondary hardening1915 1915 Edwards & Kikkawa in Jrnl. Iron & Steel Inst. 92 12 The temperature at which this secondary hardening begins is progressively raised with increasing percentages of tungsten. 1915 Edwards & Kikkawa in Jrnl. Iron & Steel Inst. 92 12 As regards the temperature at which the maximum secondary hardness is obtained..for the steel with no tungsten this is 494°. 1937 Discovery May 155/2 The tempering of high speed steel is primarily undertaken to give maximum secondary hardness. 1949 P. C. Carman Chem. Constit. & Prop. Engin. Materials v. 192 On tempering, the hardness decreases slightly between 300° and 500°C., and then secondary hardening takes place between 500° and 600°C. 1967 A. H. Cottrell Introd. Metall. xxv. 517 The steel is tempered at 650°C to produce secondary hardening by precipitation of alloy carbides. < as lemmas |
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