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- Title
The bainite transformation behavior, the influencing factors and control strategy in ferritic-pearlitic forged crankshafts with coarse grains.
- Authors
Wu, M.; He, G.; Zheng, X.; Zhao, F.; Jiang, B.; Zhang, C.; Liu, Y.
- Abstract
Microstructural characterization of the bainite in a ferritic-pearlitic forged crankshaft was carefully investigated. A Gleeble thermo-mechanical simulator as well as a high resolution dilatometer were also used to analyze the effect of cooling rate on the bainite formation and the bainite transformation mechanism in steels with different austenite grain sizes. Results show that the fine structure of the bainite mainly consists of bainitic ferrite and martensite. No segregations are found where bainite forms. Bainite tends to form in the slower cooled inner part of the crankshaft with an austenite grain size exceeding 100 mm. The formation of bainite is mainly affected by the austenite grain size as well as the cooling rate in the crankshaft studied. As the austenite grain size increases, ferrite start, pearlite finish and bainite finish temperatures are decreased. More bainite forms when bainite finish temperature decreases. The critical cooling rate of bainite transformation is increased from 0.34 °Cs-1 to 0.44 °C·s-1, if the maximum austenite grain size is refined from 216 mm to 100 mm. For ferritic-pearlitic crankshafts, or other bulky products, the elimination of bainite can be achieved through austenite grain refinement.
- Subjects
FERRITIC steel; DILATOMETERS; GRAIN size; AUSTENITE; BAINITE; FINE structure (Physics); GRAIN refinement
- Publication
Materialwissenschaft und Werkstoffechnik, 2018, Vol 49, Issue 7, p843
- ISSN
0933-5137
- Publication type
Article
- DOI
10.1002/mawe.201700231