Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 26, Issue 11, Pages 5530-5537Publisher
SPRINGER
DOI: 10.1007/s11665-017-2942-x
Keywords
chromizing; coatings; continuous cooling; inorganic; microstructure; steel
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Funding
- Natural Science Foundation of China [51575073, 51275548, 51501158]
- International Cooperation Special Project in Science and Technology of China [2015DFR70480]
- Scientific and Technological Research Program of Chongqing [cstc2014gjhz70003, cstc2017jcyjBX0031]
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In this study, induction heating chromizing (IHC) and box-type furnace heating chromizing (BFHC) were conducted on commercial AISI 5140 steels, respectively. Microstructure, microhardness and wear resistance of the chromized samples were characterized. The results show that the IHC samples have thicker Cr coating layer and stronger interface bond due to pre-compressive stress among the packed powders. Three kinds of microstructures including alloyed cementite (AC-layer), fine pearlite zone (FP-zone) and carbonpoor zone (CP-zone) are formed near the interface in the IHC samples. The main reason given for this is that different contents of Cr and C have different effects on pearlite phase and morphology. The IHC sample shows better wear properties due to its stronger interface bonding strength than that of the BFHC sample. The formation mechanism of CP-zone and its influences on microhardness and wear resistance are also discussed.
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