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本标准适用于气缸直径200毫米以内的铸造共晶铝—硅合金(钠盐变质)和铝—硅—铜—镁合金活塞经热处理后金相组织的检验。 1、技术要求 1.1 宏观组织: 宏观组织缺陷仅指铸造铝合金活塞中的针孔和疏松,在本标准中统称为孔洞。 1.1.1 分散性孔洞: 按本标准第一级别图评定,1～4级合格,大于4级不合格。 1.1.2 集中性孔洞: 按本标准第二级别图评定,1～4级合格,大于4级不合格。(个别特殊结构活塞按产品图纸规定)。
This standard applies to cylinder diameter of 200 mm within the eutectic alloy of aluminum - silicon (sodium salt deterioration) and aluminum - silicon - copper - magnesium alloy piston heat treatment after the microstructure of the test. 1, the technical requirements 1.1 Macro Organization: The macro-organizational defects only refers to the pinhole and loose casting aluminum piston in the standard referred to as the hole. 1.1.1 Disperse holes: According to the first level of this standard assessment, 1 to 4 qualified, more than 4 unqualified. 1.1.2 Concentrated holes: According to the second level of this standard assessment, 1 to 4 qualified, more than 4 failed. (Individual special structure of the piston according to product drawings).