新型渗氮钢的力学性能及渗氮特性

Mechanical properties and nitriding characteristics of novel nitriding steels

采用真空感应炉冶炼了低铝和无铝新型渗氮钢,研究了不同温度回火后钢的显微组织和力学性能。结果表明,在1000MPa强度级别下,试验钢的韧性明显高于常用的渗氮钢38CrMoAl。渗氮试验表明,在相同渗氮条件下,无铝试验钢渗层深度大、低铝渗氮钢的渗层硬度高,试验钢都具有较优良的综合渗氮性能。

Nitriding steels without and with a low Al content were prepared by vacuum induction melting method, and microstructure and mechanical properties of the steels tempered at different temperatures were investigated. The results show that the experimental steels have higher impact toughness than the commonly used nitriding steel 38CrMoAl at the strength level of 1000 MPa. The experimental steels exhibit good comprehensive nitriding performance with deeper nitriding layer for Al-free nitriding steel and with higher surface hardness for low-Al-content nitriding steel in comparison with 38CrMoAl steel under the same nitriding conditions.