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零件气体渗碳或碳氮共渗后直接淬油再低温回火,有时发现零件表面覆盖一层深褐色的膜,性脆易剥落。此膜究竟是零件表面的碳黑与淬火时所粘附的油层在低温回火时烧结而成的呢?还是出于出炉后淬火不及时而产生的氧化皮呢?若是氧化皮,则在氧化皮下还有脱碳层。因此,需判明这层膜是什么。可将该膜用手抹下、揉碎,看是否能被磁铁所吸引,若是氧化皮、则可波磁铁吸住。当然,要知道氧化皮下面的脱碳层深度,还需作金相检查。
Parts gas carburizing or carbonitriding direct quenching and then low temperature tempering, and sometimes found parts covered with a layer of dark brown film, brittle easily peel off. This film is the part of the surface of the carbon black and quenching when the oil layer is sintered at low temperature tempering it? Or out of the furnace after the quenching is not produced in time it? If the oxide scale, the oxidation Subcutaneous decarburization also. Therefore, we need to determine what this layer of film. The film can be hand wiped, crushed to see if it can be attracted by the magnet, if the oxide skin, you can wave magnet sucked. Of course, to know the depth of decarburization below the oxide scale, the need for metallographic examination.