Fracture Splitting Defects Analysis of Automotive Connecting Rod Made of Air-cooled Forging Steel 36MnVS4
ZHANG Chaolei1, WEI Yang1, FANG Wen1, MIAO Hongsheng2, WANG Qinghai2
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083; 2 Qinghai Special Steel Engineering Technology Research Center, Xining Special Steel Co., Ltd., Xining 810005
Abstract: The present work aims at the performance during fracture splitting process of a batch of automotive connecting rod products made of air-cooled forging steel 36MnVS4. The fracture splitting defects, including uneven fracture, unsuccessfully splitting fracture and large deformation after fracture, were analyzed by alloys composition measurement, microstructure quantitative analysis and room temperature mechanical properties determination. The results showed that excessively fine primary austenite grain, overproof ferrite content, enormous bainite, microstructure inhomogeneity, and high section shrinkage are the main causes of the above mentioned defects. The determination of the material’s basic characteristics and the accurate and systematic control of microstructure and properties by thermo-mechanical control process, would be the effective solution to fracture splitting defects.
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2018, Vol. 32 
