The microstructure and properties of a medium‐carbon high‐strength bainitic steel treated by integrated technology of austempering and boriding treatments (boro‐austempering) are investigated by metallographic method, electrochemical impedance spectroscopy, and so on. The results show that the carbide‐free bainite of substrate and the borided layers on the surface are successfully obtained by integrated boro‐austempering treatment. The hardness of surface is up to 2.5–3.0 times that of substrate and the surface corrosion resistance is significantly enhanced by boro‐austempering treatment, proving that boro‐austempering treatment is an effective method for increasing corrosion resistance and hardness of high‐strength bainitic steels. The present study provides a new and effective processing technology for the production of medium‐carbon high‐strength steels with better corrosion resistance and higher hardness.

中文翻译：

---

硼奥氏体回火处理的中碳高强度贝氏体钢的组织和性能

通过金相法，电化学阻抗谱法等研究了奥氏体和硼化处理（硼奥氏体化）一体化技术处理的中碳高强度贝氏体钢的组织和性能。结果表明，通过一体化的回火处理可以成功获得基体的无碳化贝氏体和表面的硼化层。表面硬度是基体的2.5-3.0倍，经硼奥氏体回火处理可显着提高表面耐腐蚀性，证明硼奥氏体回火处理是提高高强度贝氏体钢的耐蚀性和硬度的有效方法。