Abstract
Chromium electroplating and QPQ (quench-polish-quench) process are widely used methods for gun steel surface treatment. This study aims to compare the erosion behavior and mechanism of chrome-coated 25Cr3Mo2WNiV steel (Cr MPS700V) and QPQ MPS700V using promoted ignition combustion tests. By studying erosion behavior, it was found that the erosion threshold pressure and temperature of the Cr MPS700V were determined to be 0.52 MPa and 277 K higher than those of QPQ MPS700V. The surface morphology after erosion shows that the equivalent erosion depth of QPQ MPS700V is 8.2 μm deeper than that of Cr MPS700V. The superior resistance to erosion of the Cr MPS700V was ascribed to the inhibition of the Kirkendall effect at the interface between the coating and matrix. Small-sized atoms C and N in the QPQ coating were more easily diffused into matrix than large-sized atom Cr before erosion. Moreover, the oxidation heat release of Mo2C precipitated at the QPQ coating/steel interface is higher than that of Cr23C6 precipitated at the Cr coating/steel interface, which reduced the erosion performance of QPQ MPS700V.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
