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Combined hot stamping and Q & P processing with a hot air partitioning device
journal contribution
posted on 2018-12-01, 00:00 authored by B Zhu, J Zhu, Yanan WangYanan Wang, Bernard RolfeBernard Rolfe, Z Wang, Y ZhangCombining the hot stamping process and a Quench and Partition (Q&P) heat treatment can improve the mechanical properties of hot stamped automotive parts. This paper investigates using a new heating device to heat or cool a part to a given temperature. Instead of performing the partitioning heat treatment in a furnace, this work proposes using a new hot air process that performs the partitioning treatment. The new device obtains a fast heating rate and a uniform temperature distribution, necessary for Q&P. The effect of partitioning time and temperature on the mechanical properties of parts were analyzed by the new processing method, which is suitable for use in the area of industrial hot stamping. The results show that the hot air partitioning device provides more control over the partitioning temperature because convection is more efficient than radiation. Control over the quench temperature and partition is critical for the Q&P process to enable the carbon diffusion to stabilize the austenite. Furthermore, the highest product of strength and elongation (1380 MPa × 13%) using the hot air process under the authors’ set-up condition is obtained when the partitioning time is 60 s and the temperature is 425 °C, thanks to the optimum ratio between martensite and austenite, which was observed through scanning electron microscopy.
History
Journal
Journal of materials processing technologyVolume
262Pagination
392 - 402Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0924-0136Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2018, ElsevierUsage metrics
Keywords
Hot air partitioning deviceHot stampingQuenching and partitioningRetained austeniteScience & TechnologyTechnologyEngineering, IndustrialEngineering, ManufacturingMaterials Science, MultidisciplinaryEngineeringMaterials ScienceHEAT-TREATMENTCARBONSTEELSMARTENSITEAUSTENITETRANSFORMATIONTEMPERATURESMechanical Engineering
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