兑水 发表于 2009-9-15 15:33:10

ASTM B 934-2004 用显微硬度测量铁粉末冶金（P/M）部件有效...

B934-04 Standard Test Method for Effective Case Depth of Ferrous Powder Metallurgy (P/M) Parts Using Microindentation Hardness Measurements
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