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设计了用于裂解连杆的高强度非调质钢及其生产工艺,通过金相显微镜、扫描电镜等方法,分析了钢的显微组织、析出相及其对力学性能的影响。结果表明:组织由铁素体和珠光体组成,向钢中添加高的V和N元素,有利于增加更多的弥散析出相,提高其强度。轧后加速冷却,有利于铁素体晶粒细化、珠光体球团尺寸和珠光体片层间距减少、析出相增多,使其抗拉强度和屈服强度分别达到1 000 MPa和750 MPa以上。
The high-strength non-quenched and tempered steel used to crack the connecting rod was designed and its production process was designed. The microstructure and precipitated phase of the steel and its influence on the mechanical properties were analyzed by metallographic microscope and scanning electron microscope. The results show that the microstructure consists of ferrite and pearlite, and adding high V and N elements to the steel is beneficial to increase more dispersed precipitates and increase their strength. The accelerated cooling after rolling is favorable for the grain refinement of ferrite. The size of pearlite pellets and the spacing of pearlite sheets are reduced, and the precipitation phase increases. The tensile strength and yield strength reach 1 000 MPa and 750 MPa respectively.