| 单词 | air-harden | 
| 释义 | > as lemmasair-harden   air-harden  v. chiefly Metallurgy 		 (a) transitive to harden (esp. steel) by allowing it to cool or stand in air;		 (b) intransitive to harden through exposure to air. ΚΠ 1930    Engineering 23 May 680/3  				Steel A was air-hardened from 950 deg. C after soaking for 20 minutes. 1973    Ada 		(Okla.)	 Sunday News 28 Jan. 10/1 		(advt.)	  				Modelling compound with reusable plastic lids. Pliable but will air harden for permanent objects. 2006    D. A. Stephenson  & J. S. Agapiou Metal Cutting 		(ed. 2)	 603  				High-carbon steels tend to air harden, so that surface integrity problems such as residual stress and white layer formation are a particular concern. < as lemmas | 
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