Microstructural evolution of Al-Si coating and its influence on high temperature tribological behavior of ultra-high strength steel against H13 steel

Al-Si coated ultra-high strength steel（UHSS）has been commonly applied in hot stamping process.The influence of austenitizing temperature on microstructure of Al-Si coating of UHSS during hot stamping process and its tribological behavior against H13 steel under elevated temperature were simulatively...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2017-10, Vol.24 (10), p.1048-1058
Main Authors: Guo, Meng-xuan, Gao, Kai-xiang, Wang, Wu-rong, Wei, Xi-cheng
Format: Article
Language:English
Subjects:
Adhesive wear
Al-Si coating
Applied and Technical Physics
Diffusion
Engineering
Friction coefficient
Hot stamping
Intermetallic compound
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
Ultra-high strength steel
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Summary:Al-Si coated ultra-high strength steel（UHSS）has been commonly applied in hot stamping process.The influence of austenitizing temperature on microstructure of Al-Si coating of UHSS during hot stamping process and its tribological behavior against H13 steel under elevated temperature were simulatively investigated.The austenitizing temperature of Al-Si coated UHSS and its microstructual evolution were confirmed and analyzed by differential scanning calorimetry and scanning electron microscopy.A novel approach to tribological testing by replicating hot stamping process temperature history was presented.Results show that the hard and stable phases Fe_2Al_5＋FeAl_2 formed on Al-Si coating surface after exposure to 930°C for 5 min,which was found to be correlated to the tribological behavior of coating.The friction coefficient of coated steel was more stable and higher than that of uncoated one.The main wear mechanism of Al-Si coated UHSS was adhesion wear,while abrasive wear was dominant for the uncoated UHSS.
ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(17)30152-8