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低碳马氏体弹簧钢的设计原则应是:在保证弹簧使用要求的强度和硬度前提下,尽量降低弹簧钢的碳含量,以保证得到尽可能多的板条马氏体组织;其合金化以满足淬透性、弹性、工艺性及经济性等方面要求而进行合理搭配;通过在一般低温回火温度的上限区回火。在应力消除和残余奥氏体相变充分的条件下,以获得碳化物的高弥散度,造成短程、均匀、广泛且无定向的位错移动而产生微观硬化作用,从而不易产生明显的宏观塑性变形,保证钢具有良好的动负荷弹性抗力和高疲劳寿命。
The design principle of low-carbon martensitic spring steel should be: under the premise of ensuring the strength and hardness required by spring use, minimize the carbon content of spring steel to ensure that as much lath martensite as possible; and its alloying To meet the requirements of hardenability, flexibility, technology and economy, and reasonable requirements; by tempering in the upper limit of the general tempering temperature tempering. Under the conditions of stress relieving and sufficient austenite transformation, the high dispersion of carbides can be obtained, resulting in micro-hardening due to the short-range, uniform, extensive and non-directional dislocation movement, which is not easy to produce obvious macroscopic plasticity Deformation, to ensure that the steel has a good dynamic load elasticity and high fatigue life.