sigh007 发表于 2013-5-21 15:13:34

ASTM E7-03 下载

ASTM E7-03 下载
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ngwangyq 发表于 2014-7-1 15:10:14

感谢楼主分享，好东西，得看看

汪庆华new 发表于 2016-5-2 14:49:54

看看此标准tempered martensite-the decomposition products which result from heating martensite to temperatures below the ferrite austenite (Ae1) transformation temper. Under the light microscope, darkening of the martensite needles is observed in the initial stages of tempering. Prolonged tempering at high temperatures produces spheroidized carbides in a matrix of ferrite.

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