采用宏观检验、扫描电镜分析、能谱分析、化学成分分析及金相检验等方法，对某一家用不锈钢刀具在低应力下发生脆性断裂的原因进行了分析。结果表明：刀具在热处理前存在裂纹或针孔并且表面沾有油污，热处理时发生了渗碳和氧化，加之刀具使用环境中存在腐蚀性介质，从而导致刀具在使用过程中发生了低应力脆性断裂。

The causes of brittle fracture of a stainless steel household cutlery under low stress were analyzed by macro examination, scanning electron microscope analysis, energy spectrum analysis, chemical composition analysis, metallographic examination and so on. The results show that there were cracks or pinholes and greasy or oil on the surface of the cutlery, and then carburization and oxidation happened during the heat treatment process. At the same time, there were corrosive media in the cutlery use environment. So low stress brittle fracture of the cutlery happened during use.