Effect of Cooling Process on Microstructure and Mechanical Properties of High Strength Fracture Splitting Connecting Rod in Auto Engine
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摘要: 采用金相显微镜、扫描电镜和透射电镜等分析方法，研究了轧后冷却工艺对高强度汽车发动机裂解连杆用微合金非调质中碳钢的组织和性能的影响。结果表明，提高轧后冷却速度有利于钢中珠光体比例的增加，降低铁素体晶粒尺寸和减少珠光体片层间距；钢中的第二相沉淀析出相主要是弥散分布在铁素体基体中的（V，Ti）（C，N）复合相，粒度在30~170 nm，随着轧后冷却速度的增加而减小；而其屈服强度随轧后冷却速度的增加而提高，在高的冷却速度下，其屈服强度达到770 MPa，其中析出相对屈服强度的贡献达到174 MPa。Abstract: The effect of cooling process on microstructure and mechanical properties of high strength microalloyed medium-carbon steel fracture splitting connecting rod in auto engine was studied using the method of microscope, SEM and TEM, etc.The results show that high cooling rate after finished rolling can increase the percentage of pearlite, decrease the grain size of ferrite and lessen interlamellar spacing of pearlite.The precipitation phases in the steel are composite phase of (V, Ti) (C, N) with variants of the B-N orientation relationship to the ferrite.Their granularity are about 30~170 nm, and they will decrease with the speeding up cooling.The yield strength is improved with increasing the cooling rate after finished rolling, and in case of high cooling rate, the yield strength can reach to 770 MPa, with the contributing of the precipitation strengthening to yield strength being 174 MPa.
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