中、高碳钢淬火态组织较脆,受力后容易断裂。在淬火硬化过程中也易出现淬火裂纹,致使零件报废。淬火钢断口形态虽然早有观察,但对某断裂机理的研究还不充分,报导资料甚少。本研究对中、高碳钢试件进行不同温度的奥氏体化后淬火,利用扫描电 Medium and high carbon steel quenched state more brittle, easy to break after force. In the quench hardening process is also prone to quench cracking, resulting in scrap parts. Although the fracture morphology of hardened steel has been observed for a long time, the research on the fracture mechanism is still inadequate, and there are few reports on it. In this study, medium and high carbon steel specimens were austenitized and quenched at different temperatures,