Abstract
Crackable connecting rods have been widely used in cars’ engines recently. In this method no machining is needed to seperate the connecting rod into two pieces. The main microstructure of the crackable C70S6 steel is pear-lite (%90 of the structure is about pearlite). Changing the microstructure by various heat treatment applications can be economic and technologic alternatives to the use of crackable C70S6 steel. In this study, the effect of the bainitic microstructure of the crackable C70S6 steel is ex-amined. Austempering has been applied to the crackable C70S6 steel and then fracture experiments has been carried out. It has been observed a perfect fracture surface. The hardness value of the fracture surface has been measured. Optical and SEM observations have showed us a perfect upper bainitic microstructure. It has been concluded that bainitic microstructure can be an important alternative to the convensional pearlitic crackable C70S6 connecting rods. DOI: http://dx.doi.org/10.5755/j01.mech.20.3.5384
Highlights
The fracture splitting method is an innovative processing technique in the field of the automobile engine connecting rod manufacturing
C70S6 is excellent in fracturesplitability thanks to its small deformation during splitting, it has a coarser structure than the ferrite/pearlite structure of the medium-carbon micro-alloyed steels currently used as connecting rod steels
The inferior machinability of C70S6 owing to its pearlite structure has kept the steel from finding extensive utilization
Summary
The fracture splitting method is an innovative processing technique in the field of the automobile engine connecting rod (con/rod) manufacturing. The technique can improve product quality and bearing capability [1] It provides a high quality, high accuracy and low cost route for producing connecting rods (con/rods). Sawing and machining processes of the rod and cap, in order to mate two faces can be eliminated, and is believed to reduce the production cost by 25%. Another advantage of this production method is that fracturesplitting connecting rods exhibit 30% higher fatigue strength and 13% less weight than conventional connecting rods, and can be splitted into two pieces (big body and cap) by fracturing with an instant impact load. It provides more advantageous production opportunities, and is prefered in manufacturing technology mostly [2]
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