新型低碳马氏体弹簧钢35SI2CrVB的研究

传统中、高碳弹簧钢在性能、生产和使用上存在许多缺点，为适应汽车工业发展的需要，研究了碳含量较低的新型低碳马氏体弹簧钢35Si2CrVB。经与传统弹簧钢60Si2MnA相比较，该钢不仅有高的强度、塑韧性，良好的综合力学性能，而且具有低的脱碳敏感性、高的淬透性和高的弹减抗力等。显微组织观察发现，由于35Si2CrVB钢的含碳量降低，其淬火组织发生了变化，几乎全是具有高位错密度的板条状马氏体，而且只有极少量孪晶结构的片状马氏体。

Study on New Low Carbon Martensite Spring Steel

The traditional middle and high carbon spring steels have some drawbacks in properties,production and application,in order to meet the demands of rapid development of automobile,therefore,a new low carbon spring steel 35Si2CrVB has been investigated.Comparing the new spring steel 35Si2CrVB with the traditional spring steel 60Si2MnA it is shown that the new spring steel has not only high strength,good ductility,good comprehensive mechanical properties,but also low decarbonization tendency,sufficient hardenability and high elastic sag resistance etc.The microstructure change in quenched steel,caused by the decreasing of carbon content,was detected through metallographic observation.The new low carbon spring steel 35Si2CrVB after quenching is composed of almost lath martensite with high dislocation density and only a little plaste martensite with twins structure.