Effect of Contact Pressure during Mechanical Properties Quenching on Microstructures and of Hot-stamping Parts

An experimental apparatus with cooling system and pressure-adjustment assembly for simulating quench- ing was constructed to investigate the effect of contact pressure on the microstructures and mechanical properties of hot stamping parts. Qualitative and quantitative analyses of the microstructures...

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Bibliographic Details
Published in:钢铁研究学报：英文版 2015 (12), p.1138-1143
Main Author: Zheng-wei GU Meng meng LU Guan-han LU Xin LI Hong XU
Format: Article
Language:English
Subjects:
冲压件
力学性能
压力调节装置
微结构
接触压力
机械特性
淬火过程
零件性能
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Summary:An experimental apparatus with cooling system and pressure-adjustment assembly for simulating quench- ing was constructed to investigate the effect of contact pressure on the microstructures and mechanical properties of hot stamping parts. Qualitative and quantitative analyses of the microstructures of the as quenched parts were con- ducted; moreover, hardness and tensile tests were performed to measure their mechanical properties. The results in- dicated that contact pressure during quenching strongly affected the structures and performances of hot-stamping components. An excessive low contact pressure led to insufficient martensitic transformation. The critical contact pressure for complete martensitic transformation for 4.0 mm 22MnB5 steel was 0.4 MPa when the temperature of the coolant was 20 ℃. However, in consideration of the efficiency of practical production, a contact pressure higher than 1.25 MPa is recommended.
ISSN:1006-706X
2210-3988